Journal Articles

Millen, NM, Rundle, RP, Samson, JH, Tilma, T, Bishop, RF, Everitt, M (2023) Generalized phase-space techniques to explore quantum phase transitions in critical quantum spin systems, Annals of Physics, 458(Part 2), 169459, ISSN: 0003-4916. DOI: 10.1016/j.aop.2023.169459.

Tilma, T, Ciampini, MA, Everitt, M, Munro, WJ, Mataloni, P, Nemoto, K, Barbieri, M (2022) Visualizing multiqubit correlations using the Wigner function, The European Physical Journal D, 76(5), 90, ISSN: 1434-6060. DOI: 10.1140/epjd/s10053-022-00419-1.

Rundle, RP and Everitt, MJ (2021) An informationally complete Wigner function for the Tavis–Cummings model: Visualization of cat swapping and quantum correlations in field–many-atom systems, Journal of Computational Electronics, ISSN: 1569-8025. DOI: 10.1007/s10825-021-01777-6.

Rundle, RP and Everitt, M (2021) Overview of the phase space formulation of quantum mechanics with application to quantum technologies, Advanced Quantum Technologies, 4(6), 2100016, ISSN: 2511-9044. DOI: 10.1002/qute.202100016.

Rundle, R, Davies, B, Dwyer, V, Tilma, T, Everitt, M (2020) Visualization of correlations in hybrid discrete—continuous variable quantum systems, Journal of Physics Communications, 4(2), 025002, DOI: 10.1088/2399-6528/ab6fb6.

Bowen, J, Everitt, M, Phillips, I, Dwyer, V (2019) Generalized quantum cumulant dynamics, The Journal of Chemical Physics, 151(24), 244107, ISSN: 0021-9606. DOI: 10.1063/1.5130754.

Mills, PW, Rundle, R, Samson, J, Devitt, SJ, Tilma, T, Dwyer, V, Everitt, M (2019) Quantum invariants and the graph isomorphism problem, Physical Review A, 100(5), 052317, ISSN: 2469-9926. DOI: 10.1103/physreva.100.052317.

Davies, B, Rundle, R, Dwyer, V, Samson, J, Tilma, T, Everitt, M (2019) Visualizing spin degrees of freedom in atoms and molecules, Physical Review A, 100(4), pp.1-9, ISSN: 2469-9926. DOI: 10.1103/physreva.100.042102.

Rundle, RP, Tilma, T, Samson, JH, Dwyer, VM, Bishop, RF, Everitt, MJ (2019) General approach to quantum mechanics as a statistical theory, Physical Review A, 99(1), 012115, ISSN: 2469-9926. DOI: 10.1103/physreva.99.012115.

El-Zant, AA, Everitt, MJ, Kassem, SM (2019) Errors, chaos, and the collisionless limit, Monthly Notices of the Royal Astronomical Society, 484(2), pp.1456-1474, ISSN: 0035-8711. DOI: 10.1093/mnras/stz029.

Bjergstrom, K, Huish, WG, Henshaw, M, Dwyer, V, Everitt, M (2018) Transformational effects of applying systems engineering in laboratory scientific research, IEEE Systems Journal, 13(2), pp.1924-1935, ISSN: 1932-8184. DOI: 10.1109/JSYST.2018.2865856.

Dwyer, V, Duffus, SNA, Everitt, M (2017) Open quantum systems, effective Hamiltonians, and device characterization, Physical review B: Condensed Matter and Materials Physics, 96(13), ISSN: 2469-9950. DOI: 10.1103/PhysRevB.96.134520.

Rundle, RP, Mills, PW, Tilma, T, Samson, JH, Everitt, MJ (2017) Simple procedure for phase-space measurement and entanglement validation (vol 96, 022117, 2017), PHYSICAL REVIEW A, 96(4), ARTN 049903, ISSN: 2469-9926. DOI: 10.1103/PhysRevA.96.049903.

Ralph, JF, Jacobs, K, Everitt, MJ (2017) Observing quantum chaos with noisy measurements and highly mixed states, Physical Review A, 95(1), ISSN: 2469-9926. DOI: 10.1103/PhysRevA.95.012135.

Rundle, R, Mills, PW, Tilma, T, Samson, J, Everitt, M (2017) Simple procedure for phase-space measurement and entanglement validation, Physical Review A, 96, ISSN: 2469-9926. DOI: 10.1103/PhysRevA.96.022117.

Tilma, T, Everitt, M, Samson, J, Munro, WJ, Nemoto, K (2016) Wigner Functions for Arbitrary Quantum Systems, Physical Review Letters, 117(18), 180401, ISSN: 0031-9007. DOI: 10.1103/PhysRevLett.117.180401.

Duffus, SNA, Bjergstrøm, KN, Dwyer, VM, Samson, JH, Spiller, TP, Zagoskin, AM, Munro, WJ, Nemoto, K, Everitt, MJ (2016) Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies, Physical Review B: Condensed Matter and Materials Physics, ISSN: 1550-235X.

Paton, JE, Wootton, MJ, Everitt, M (2015) On the quantum-to-classical transition of a particle in a box, Annalen der Physik, 527(1-2), pp.162-168, ISSN: 0003-3804. DOI: 10.1002/andp.201400119.

Sowa, AP, Everitt, M, Samson, J, Saveliev, S, Zagoskin, A, Heidel, S, Zuniga-Anaya, JC (2015) Recursive simulation of quantum annealing, ISSN: 1751-8113. DOI: 10.1088/1751-8113/48/41/415301.

Everitt, M, Samson, J, Saveliev, S, Wilson, RD, Zagoskin, A, Spiller, TP (2014) Tunable refraction in a two-dimensional quantum-state metamaterial, Phys. Rev. A, 90, p.023837, ISSN: 2469-9926. DOI: 10.1103/PhysRevA.90.023837.

Kohnle, A, Bozhinova, I, Browne, D, Everitt, M, Fomins, A, Kok, P, Kulaitis, G, Prokopas, M, Raine, D, Swinbank, E (2014) A new introductory quantum mechanics curriculum, European Journal of Physics, 35(1), ISSN: 0143-0807. DOI: 10.1088/0143-0807/35/1/015001.

Everitt, M, Spiller, TP, Milburn, GJ, Wilson, RD, Zagoskin, A (2014) Engineering dissipative channels for realizing Schrödinger cats in SQUIDs, Frontiers in ICT, 1, ISSN: 2297-198X. DOI: 10.3389/fict.2014.00001.

Zagoskin, AM, Wilson, RD, Everitt, M, Savel'Ev, S, Gulevich, DR, Allen, J, Dubrovich, VK, Il'Ichev, E (2013) Spatially resolved single photon detection with a quantum sensor array, Scientific Reports, 3, DOI: 10.1038/srep03464.

Wilson, RD, Everitt, MJ, Savel'Ev, S, Zagoskin, AM (2013) The influence of dissipation in a 1D quantum metamaterial, Superconductor Science and Technology, 26(8), ISSN: 0953-2048. DOI: 10.1088/0953-2048/26/8/084005.

Wilson, RD, Everitt, MJ, Samson, JH, Savelev, SE, Zagoskin, AM, Spiller, TP (2013) Transmission through a two dimensional quantum metamaterial, Proceedings of SPIE - The International Society for Optical Engineering, 8771, ISSN: 0277-786X. DOI: 10.1117/12.2018057.

Dooley, S, McCrossan, F, Harland, D, Everitt, MJ, Spiller, TP (2013) Collapse and revival and cat states with an N-spin system, Physical Review A - Atomic, Molecular, and Optical Physics, 87(5), ISSN: 1050-2947. DOI: 10.1103/PhysRevA.87.052323.

Zagoskin, A, Wilson, RD, Everitt, M, Savel'ev, S, Gulevich, DR, Allen, J, Dubrovich, VK, Il'ichev, E (2013) Is a single photon's wave front observable?, ISSN: 2045-2322.

Harland, D, Everitt, MJ, Nemoto, K, Tilma, T, Spiller, TP (2012) Towards a complete and continuous Wigner function for an ensemble of spins or qubits, Physical Review A - Atomic, Molecular, and Optical Physics, 86(6), ISSN: 1050-2947. DOI: 10.1103/PhysRevA.86.062117.

Wilson, RD, Zagoskin, AM, Savel'Ev, S, Everitt, MJ, Nori, F (2012) Feedback-controlled adiabatic quantum computation, Physical Review A - Atomic, Molecular, and Optical Physics, 86(5), ISSN: 1050-2947. DOI: 10.1103/PhysRevA.86.052306.

Everitt, MJ, Munro, WJ, Spiller, TP (2012) Overcoming decoherence in the collapse and revival of spin Schrödinger-cat states, Physical Review A - Atomic, Molecular, and Optical Physics, 85(2), ISSN: 1050-2947. DOI: 10.1103/PhysRevA.85.022113.

Everitt, M, Spiller, TP, Milburn, GJ, Wilson, RD, Zagoskin, A (2012) Cool for cats.

Everitt, MJ, Munro, WJ, Spiller, TP (2010) Quantum measurement with chaotic apparatus, PHYSICS LETTERS A, 374(28), pp.2809-2815, ISSN: 0375-9601. DOI: 10.1016/j.physleta.2010.05.006.

Abdel Aty, M and Everitt, MJ (2010) Delayed creation of entanglement in superconducting qubits interacting with a microwave field, The European Physical Journal B, 74, pp.81-89, DOI: 10.1140/epjb/e2010-00056-y.

Everitt, MJ, Clark, TD, Ralph, JF, Stiffell, PB (2010) The controlled creation of a maximally entangled state between a SQUID ring and a single electromagnetic field mode, Physica C, 471, pp.517-522, ISSN: 0921-4534. DOI: 10.1016/j.phys.2010.01.005.

Everitt, MJ (2009) Non-linear dynamics, entanglement and the quantum-classical crossover of two coupled squid rings, International Journal of Modern Physics B, 23(20 & 21), pp.4311-4319, ISSN: 0217-9792. DOI: 10.1142/S0217979209063468.

Everitt, MJ (2009) Persistent Entanglement in Two Coupled SQUID Rings in the Quantum to Classical Transition: A Quantum Jumps Approach, Journal of Russian Laser Research, 30(5), pp.412-417, ISSN: 1071-2836.

Everitt, MJ, Munro, WJ, Spiller, TP (2009) Quantum-classical crossover of a field mode, Physical Review A, 79(3), pp.032328-1/6, ISSN: 1050-2947. DOI: 10.1103/PhysRevA.79.032328.

Everitt, MJ (2009) On the correspondance principle: implications from a study of the nonlinear dynamics of a macroscopic quantum device, New Journal of Physics, 11(1), pp.013014-013029, ISSN: 1367-2630. DOI: 10.1088/1367-2630/11/1/013014.

Everitt, MJ, Khalil, S, Zagoskin, AM (2008) On "non-Hermitian Quantum Mechanics", n/a.

Everitt, MJ (2007) Recovery of classical chaotic-like behaviour in a quantum three body problem, Physical Review E, 75(3), pp.036217-1/6, ISSN: 1539-3755. DOI: 10.1103/PhysRevE.75.036217.

Everitt, MJ, Clark, TD, Stiffell, PB, Ralph, JF, Bulsara, AR, Harland, CJ (2005) Signatures of chaoticlike and nonchaoticlike behavior in a nonlinear quantum oscillator through photon detection, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 72(6), ISSN: 1539-3755. DOI: 10.1103/PhysRevE.72.066209.

Harland, CJ, Clark, TD, Peters, NS, Everitt, MJ, Stiffell, PB (2005) A compact electric potential sensor array for the acquisition and reconstruction of the 7-lead electrocardiogram without electrical charge contact with the skin, Physiological Measurement, 26(6), pp.939-950, ISSN: 0967-3334. DOI: 10.1088/0967-3334/26/6/005.

Stiffell, P, Everitt, MJ, Clark, TD, Ralph, JF (2005) Control of multilevel voltage states in a hysteretic superconducting-quantum-interference-device ring-resonator system, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 72(5), ISSN: 1539-3755. DOI: 10.1103/PhysRevE.72.056201.

Stiffell, PB, Everitt, MJ, Clark, TD, Harland, CJ, Ralph, JF (2005) Quantum downconversion and multipartite entanglement via a mesoscopic superconducting quantum interference device ring, Physical Review B - Condensed Matter and Materials Physics, 72(1), ISSN: 1098-0121. DOI: 10.1103/PhysRevB.72.014508.

Everitt, MJ, Clark, TD, Stiffell, PB, Ralph, JF, Harland, CJ (2005) Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring, Physical Review B, 72(9), pp.094509-1/7, ISSN: 1098-0121. DOI: 10.1103/PhysRevB.72.094509.

Everitt, MJ, Clark, TD, Stiffell, PB, Ralph, JF, Bulsara, AR, Harland, CJ (2005) Persistent entanglement in the classical limit, New Journal of Physics, 7, ISSN: 1367-2630. DOI: 10.1088/1367-2630/7/1/064.

Ralph, JF, Griffith, EJ, Clark, TD, Everitt, MJ (2004) Guidance and control in a Josephson charge qubit, Physical Review B - Condensed Matter and Materials Physics, 70(21), pp.1-9, ISSN: 1098-0121. DOI: 10.1103/PhysRevB.70.214521.

Everitt, MJ, Clark, TD, Stiffell, PB, Vourdas, A, Ralph, JF, Prance, RJ, Prance, H (2004) Superconducting analogs of quantum optical phenomena: Macroscopic quantum superpositions and squeezing in a superconducting quantum-interference device ring, Physical Review A - Atomic, Molecular, and Optical Physics, 69(4), ISSN: 1050-2947. DOI: 10.1103/PhysRevA.69.043804.

Konstadopoulou, A, Hollingworth, JM, Everitt, M, Vourdas, A, Clark, TD, Ralph, JF (2003) Vortices in Josephson arrays interacting with non-classical microwaves: The effect of dissipation, European Physical Journal B, 32(3), pp.279-285, ISSN: 1434-6028. DOI: 10.1140/epjb/e2003-00098-2.

Ralph, JF, Clark, TD, Everitt, MJ, Prance, H, Stiffell, P, Prance, RJ (2003) Characterising a solid state qubit via environmental noise, Physics Letters, Section A: General, Atomic and Solid State Physics, 317(3-4), pp.199-205, ISSN: 0375-9601. DOI: 10.1016/j.physleta.2003.08.061.

Gebrial, W, Prance, RJ, Clark, TD, Harland, CJ, Prance, H, Everitt, M (2002) Noninvasive imaging of signals in digital circuits, Review of Scientific Instruments, 73(3 I), p.1293, ISSN: 0034-6748. DOI: 10.1063/1.1447302.

Ralph, JF, Clark, TD, Everitt, MJ, Stiffell, P (2001) Nonlinear backreaction in a quantum mechanical SQUID, Physical Review B - Condensed Matter and Materials Physics, 64(18), pp.1805041-1805044, ISSN: 0163-1829.

Everitt, MJ, Clark, TD, Stiffell, P, Prance, H, Prance, RJ, Vourdas, A, Ralph, JF (2001) Quantum Statistics and Entanglement of Two Electromagnetic Field Modes Coupled via a Mesoscopic, Physical Review B, 64(18), pp.184517-1/13, ISSN: 0163-1829. DOI: 10.1103/PhysRevB.64.184517.

Clark, TD, Prance, RJ, Whiteman, R, Prance, H, Everitt, MJ, Bulsara, AR, Ralph, JF (2001) Giant relaxation oscillations in a very strongly hysteretic superconductive quantum interference device ring-tank circuit system, Journal of Applied Physics, 90(6), pp.3042-3047, ISSN: 0021-8979. DOI: 10.1063/1.1398594.

Konstadopoulou, A, Hollingworth, JM, Everitt, M, Vourdas, A, Clark, TD, Ralph, JF (2001) Mesoscopic Josephson arrays interacting with non-classical electromagnetic fields and their applications, IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY, 148(5), pp.229-232, ISSN: 1350-2344. DOI: 10.1049/ip-smt:20010394.

Prance, H, Clark, TD, Whiteman, R, Prance, RJ, Everitt, M, Stiffell, P, Ralph, JF (2001) Pinch resonances in a radio-frequency-driven superconducting-quantum-interference-device ring-resonator system, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 64(1 II), ISSN: 1539-3755.

Everitt, MJ, Stiffell, P, Clark, TD, Vourdas, A, Ralph, JF, Prance, H, Prance, RJ (2001) Fully Quantum-mechanical model of a squid ring coupled to an electromagnetic field, Physical Review B, 63(14), pp.144530-1/7, ISSN: 0163-1829. DOI: 10.1103/PhysRevB.63.144530.

Prance, RJ, Whiteman, R, Clark, TD, Prance, H, Schöllmann, V, Ralph, JF, Al-Khawaja, S, Everitt, M (1999) Erratum: Nonlinear Multilevel Dynamics of a Coupled SQUID Ring–Resonator System in the Hysteretic Regime [Phys. Rev. Lett. 82, 5401 (1999)], Physical Review Letters, 83(11), pp.2284-2284, ISSN: 0031-9007. DOI: 10.1103/physrevlett.83.2284.

Prance, RJ, Whiteman, R, Clark, TD, Prance, H, Schöllmann, V, Ralph, JF, Al-Khawaja, S, Everitt, M (1999) Nonlinear multilevel dynamics of a coupled SQUID ring–resonator system in the hysteretic regime, Physical Review Letters, 82(26), pp.5401-5404, ISSN: 0031-9007. DOI: 10.1103/PhysRevLett.82.5401.

Whiteman, R, Schöllmann, V, Everitt, M, Clark, TD, Prance, RJ, Prance, H, Diggins, J, Buckling, G, Ralph, JF (1998) Adiabatic modulation of a superconducting quantum interference device (SQUID) ring by an electromagnetic field, Journal of Physics Condensed Matter, 10(44), pp.9951-9968, ISSN: 0953-8984. DOI: 10.1088/0953-8984/10/44/004.

Clark, TD, Diggins, J, Ralph, JF, Everitt, M, Prance, RJ, Prance, H, Whiteman, R, Widom, A, Srivastava, YN (1998) Coherent Evolution and Quantum Transitions in a Two Level Model of a SQUID Ring, Annals of Physics, 268(1), pp.1-30, ISSN: 0003-4916. DOI: 10.1006/aphy.1998.5821.

Whiteman, R, Clark, TD, Prance, RJ, Prance, H, Schöllmann, V, Ralph, JF, Everitt, M, Diggins, J (1998) Microwave-induced quantum transitions in a superconducting quantum interference device, Journal of Modern Optics, 45(6), pp.1175-1184, ISSN: 0950-0340. DOI: 10.1080/09500349808230908.

Cullimore, M, Everitt, MJ, Ormerod, MA, Samson, JH, Wilson, RD, Zagoskin, AM (Accepted for publication) The relationship between minimum gap and success probability in adiabatic quantum computing, J. Phys. A: Math. Theor, 45, p.505305, DOI: 10.1088/1751-8113/45/50/505305.

Savel'ev, SE, Washington, Z, Zagoskin, AM, Everitt, MJ (Accepted for publication) Harmonic mixing in two coupled qubits: quantum synchronization via ac drives, Phys. Rev. A, 86, p.065803, DOI: 10.1103/PhysRevA.86.065803.

Conferences

Everitt, M, Henshaw, M, Dwyer, V (2016) Quantum systems engineering: a structured approach to accelerating the development of a quantum technology industry. In Invited contribution to 18th International Conference on Transparent Optical Networks ICTON 2016 (topic: quantum photonics), Trento, Italy,ISBN: 9781509014675. DOI: 10.1109/ICTON.2016.7550613.

Wilson, RD, Everitt, MJ, Munro, WJ, Spiller, TP (2013) Signatures of the collapse and revival of a spin Schr ̈odinger cat state in a continuously monitored field mode. In , Proc. SPIE, pp.87730Y-87730Y-6-87730Y-87730Y-6, DOI: 10.1117/12.2018058.

Everitt, MJ, Munro, WJ, Spiller, TP (2011) Quantum measurement and the quantum to classical transition in a non-linear quantum oscillator. In , Journal of Physics: Conference Series. DOI: 10.1088/1742-6596/306/1/012045.

EVERITT, MJ (2009) NON-LINEAR DYNAMICS, ENTANGLEMENT AND THE QUANTUM-CLASSICAL CROSSOVER OF TWO COUPLED SQUID RINGS. In Proceedings of the 32nd International Workshop, Condensed Matter Theories. DOI: 10.1142/9789814289153_0030.

Everitt, MJ (2009) Numerically solving the Schrodinger Equation for SQUID rings. In AlHammadi, PA-A and Abdel-Aty, DM (ed) International Conference on Recent Trends in Mathematical Sciences, The Association of Arab Universities for Basic and Applied Sciences, University of Bahrain, pp.49-56.

Stiffell, PB, Everitt, MJ, Clark, TD, Bulsara, AR, Ralph, JF (2006) A SQUID ring-resonator finate state machine. In , Understanding Complex Systems, pp.145-151, ISBN: 9783540338772. DOI: 10.1007/3-540-33878-0_12.

Everitt, MJ (2006) Creating Entangled States between SQUID Rings and Electromagnetic Fields. In Macroscopic Quantum Coherence and Computing, Naples, Italy, pp.219-227, ISBN: 978-0-387-26332-8. DOI: 10.1007/0-387-31143-2_27.

Stiffell, PB, Everitt, MJ, Clark, TD, Ralph, JF, Vourdas, A (2006) Frequency Down Conversion and Entanglement between Electromagnetic Field Modes via a Mesoscopic SQUID Ring. In Ruggiero, B, Delsing, P, Granata, C, Pashkin, Y, Silvestrini, P (ed) Quantum computing and quantum bits in mesoscopic systems, Quantum Computing in Solid State Systems, Naples, Italy, pp.228-238, ISBN: 978-0-387-26332-8. DOI: 10.1007/0-387-31143-2_28.

Ralph, JF, Griffith, EJ, Clark, TD, Everitt, MJ (2005) A proportional guidance law for quantum information processing. In , Proceedings of SPIE - The International Society for Optical Engineering, pp.32-39, DOI: 10.1117/12.603314.

Ralph, JF, Griffith, EJ, Clark, TD, Everitt, MJ, Stiffell, P (2004) Characterising a superconducting charge qubit via environmental noise. In , Proceedings of SPIE - The International Society for Optical Engineering, pp.242-249, DOI: 10.1117/12.541492.

Clark, TD, Ralph, JF, Everitt, MJ, Stiffell, PB, Prance, RJ, Prance, H (2004) Manipulating Quantum Transitions in a persistent current qubit. In Leggett, AJ, Ruggiero, B, Silvestrini, P (ed) Macroscopic Quantum Coherence and Computing, Quantum computing and quantum bits in mesoscopic systems, Naples, Italy, p.59, ISBN: 9780306479045.

Everitt, MJ, Stiffell, PB, Clark, TD, Prance, RJ, Prance, H (2004) SQUID rings as devices for controlling quantum entanglement and information. In Legget, AJ, Ruggiero, B, Silvestrini, P (ed) Macroscopic Quantum Coherence and Computing, Quantum computing and quantum bits in mesoscopic systems, Naples, Italy, p.47, ISBN: 9780306479045.

Konstadopoulou, A, Hollingworth, JM, Vourdas, A, Everitt, MJ, Clark, TD, Ralph, JF (2004) Vortices in Josephson Junction arrays interacting with nonclassical microwaves in a dissipative environment. In Leggett, A, Ruggiero, B, Silvestrini, P (ed) Macroscopic Quantum Coherence and Computing, Quantum computing and quantum bits in mesoscopic systems, Naples, Italy, p.69, ISBN: 9780306479045.

Ralph, JF, Clark, TD, Everitt, MJ, Steiffell, P, Prance, RJ, Prance, H (2002) The control of a superconducting qubit in the presence of a nonlinear backreaction. In , Proceedings of SPIE - The International Society for Optical Engineering, pp.136-143, DOI: 10.1117/12.477421.

Ralph, JF, Clark, TD, Everitt, MJ, Stiffell, PB, Vourdas, A, Prance, RJ, Prance, H (2001) Behavior of a persistent current qubit in a time-dependent electromagnetic field. In Donkor, E, Pirich, AR, Taylor, EW (ed) Photonic and Quantum Technologies for Aerospace Applications III, Field Theory and Electrodynamics in Quantum Computing, Orlando, Florida, p.181, DOI: 10.1117/12.434218.

Everitt, MJ, Stiffell, PB, Ralph, JF, Clark, TD, Vourdas, A, Prance, H, Prance, RJ (2001) The Non-Perturbative Quantum Behaviour of a Squid Ring in a Strong Electromagnetic Field. In Averin, DV, Ruggiero, B, Silvestrini, P (ed) Macroscopic Quantum Coherence and Quantum Computing, Naples, Italy, pp.389-398, ISBN: 978-1-4613-5459-8. DOI: 10.1007/978-1-4615-1245-5_39.

Konstadopoulou, A, Hollingworth, JM, Everitt, M, Vourdas, A, Clark, TD, Ralph, JF (2000) Mesoscopic Josephson arrays interacting with non-classical electromagnetic fields and their applications. In , IEE Colloquium (Digest), pp.21-29.

Prance, H, Whiteman, R, Prance, RJ, Clark, TD, Ralph, JF, Schollmann, V, Everitt, M, Al-Khawaja, S (2000) Non-adiabatic phenomena in a coupled SQUID ring-tank circuit system in the strongly hysteretic regime. In , STOCHASTIC AND CHAOTIC DYNAMICS IN THE LAKES, pp.575-582, ISBN: 1-56396-915-7.

Whiteman, R, Diggins, J, Clark, TD, Prance, RJ, Prance, H, Schollmann, V, Ralph, JF, Everitt, M, Spiller, TP (1998) Energy level structure and coherence in SQUID rings. In , PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON PHENOMENOLOGY OF UNIFICATION FROM PRESENT TO FUTURE, pp.239-253, ISBN: 981-02-3591-7.

Whiteman, RR, Diggins, J, Schollmann, V, Clark, TD, Prance, RJ, Prance, H, Ralph, JF, Everitt, M (1997) Non-linear quantum mechanical ground state SQUID magnetometer dynamics. In , APPLIED NONLINEAR DYNAMICS AND STOCHASTIC SYSTEMS NEAR THE MILLENNIUM, pp.261-266, ISBN: 1-56396-736-7.

Internet Publications

Bjergstrom, K, Cross, T, Dwyer, V, Everitt, M, Henshaw, M, John, P, Lemon, J, Lobo, LM, Murray, R, Paul, D, Pritchard, J, Ralph, JF, Till, S, Wrigley, C (2016) Towards a UK co-operative for the advancement of quantum technology. DOI: 10.13140/RG.2.2.25922.38087.

Raine, D, Browne, D, Everitt, MJ, Kok, P, Kohnle, A (2013) Quantum Physics.

Datasets

Millen, NM, Rundle, RP, Samson, JH, Tilma, T, Bishop, RF, Everitt, M (2024) Supplemental information files for Generalized phase-space techniques to explore quantum phase transitions in critical quantum spin systems, DOI: 10.17028/rd.lboro.25250734.

Media

Rundle, R, Mills, P, Tilma, T, Samson, J, Everitt, M (2017) Supporting animation 1 of 3 for Simple procedure for phase-space measurement and entanglement validation.

Rundle, R, Mills, P, Tilma, T, Samson, J, Everitt, M (2017) Supporting animation 2 of 3 for Simple procedure for phase-space measurement and entanglement validation.

Rundle, R, Mills, P, Tilma, T, Samson, J, Everitt, M (2017) Supporting animation 3 of 3 for Simple procedure for phase-space measurement and entanglement validation.

Other

Weinbub, J, Everitt, M, Ferry, DK (2021) Special issue on Wigner functions in computational electronics and photonics. DOI: 10.1007/s10825-021-01814-4.

Duffus, SNA (2018) Open quantum systems, effective Hamiltonians and device characterisation, We investigate the some of the many subtleties in taking a microscopic approach to modelling the decoherence of an Open Quantum System. We use the RF-SQUID, which will be referred to as a simply a SQUID throughout this paper, as a non-linear example and consider different levels of approximation, with varied coupling, to show the potential consequences that may arise when characterising devices such as superconducting qubits in this manner. We first consider a SQUID inductively coupled to an Ohmic bath and derive a Lindblad master equation, to first and second order in the Baker-Campbell-Hausdorff expansion of the correlation-time-dependent flux operator. We then consider a SQUID both inductively and capacitively coupled to an Ohmic bath and derive a Lindblad master equation to better understand the effect of parasitic capacitance whilst shedding more light on the additions, cancellations and renormalisations that are attributed to a microscopic approach..

Bjergstrom, KN, Huish, WGB, de C Henshaw, MJ, Dwyer, VM, Everitt, M (2017) The Transformational Effects of Applying Systems Engineering in Laboratory Scientific Research,

Through case study analysis of physicists working in quantum systems, we establish that knowledge of Systems Engineering (SE) will benefit scientists by ensuring that experimental apparatus is robust and fully meets the experiment requirements. We suggest a paradigm shift in the training of early career research scientists to ensure they have a strong appreciation of the systems approach and experience of applying SE techniques. Two case studies were used: the first was a detailed analysis of increasing levels of SE in the development of a 3D-printer for fabricating superconducting nano-circuitry. Applying SE techniques improved record keeping, reduced the risk of failure modes and took better account of future development through which scientific discovery may be exploited in practical devices. The second case study focused on a group of 30 quantum physics PhD students undertaking a short-course in basic SE, and used their opinions to check and add confidence to the findings of the first case study. A variety of tools were used in both studies and, in both cases, the Functional Failure Means Effects Analysis (FFMEA) technique was considered to be most useful. Recommendations are made for the future training of early career scientists to include some light-weight Systems Engineering.

. DOI: 10.31224/osf.io/5t2ku.

Bowen, JJ, Dwyer, VM, Phillips, IW, Everitt, MJ (Accepted for publication) On Calculating the Dynamics of Very Large Quantum Systems, Due to the exponential growth of the state space of coupled quantum systems it is not possible, in general, to numerically store the state of a very large number of quantum systems within a classical computer. We demonstrate a method for modelling the dynamical behaviour of measurable quantities for very large numbers of interacting quantum systems. Our approach makes use of a symbolic non-commutative algebra engine that we have recently developed in conjunction with the well-known Ehrenfest theorem. Here we show the possibility of determining the dynamics of experimentally observable quantities, without approximation, for very large numbers of interacting harmonic oscillators. Our analysis removes a large number of significant constraints present in previous analysis of this example system (such as having no entanglement in the initial state). This method will be of value in simulating the operation of large quantum machines, emergent behaviour in quantum systems, open quantum systems and quantum chemistry to name but a few..

Ciampini, MA, Tilma, T, Everitt, MJ, Munro, WJ, Mataloni, P, Nemoto, K, Barbieri, M (Accepted for publication) Wigner function reconstruction of experimental three-qubit GHZ and W states, Assessing the quality of a multi-qubit state is a multi-faceted problem, It involves considering disparate aspects, and, while some of these are collective indicators such as purity and degree of entanglement, others look more in detail at the form of the correlations between subsystems. Obtaining a visualisation of these details would give at least a qualitative indication, but the density matrix, with its large number of parameters, hardly offers insights. Here we show how relying on the Wigner function of a multipartite system provides rich information on the state, both at an illustrative level, by choosing proper slicing on the phase space, and at a quantitative one, by introducing new figures of merit for the state quality. We test this concept on a GHZ and W state produced in a photonic architecture making use of the multiple degrees of freedom of two photons..

Rundle, RP, Davies, BI, Dwyer, VM, Tilma, T, Everitt, MJ (Accepted for publication) Visualization of correlations in hybrid quantum systems, In this work we construct Wigner functions for hybrid continuous and discrete variable quantum systems. We demonstrate new capabilities in the visualization of the interactions and correlations within hybrid quantum systems. Specifically, we show how to clearly distinguish signatures that arise due to quantum and classical correlations in an entangled Bell-cat state. We further show how correlations are manifested in different types of interaction, leading to a deeper understanding of how quantum information is shared between two subsystems. Understanding the nature of the correlations between systems is central to harnessing quantum effects for information processing; the methods presented here reveal the nature of these correlations, allowing a clear visualization of the quantum information present in hybrid quantum systems. The methods presented here could be viewed as a form of quantum state spectroscopy..

Mills, PW, Rundle, RP, Samson, JH, Devitt, SJ, Tilma, T, Dwyer, VM, Everitt, MJ (Accepted for publication) On quantum invariants and the graph isomorphism problem, Three new graph invariants are introduced which may be measured from a quantum graph state and form examples of a framework under which other graph invariants can be constructed. Each invariant is based on distinguishing a different number of qubits. This is done by applying alternate measurements to the qubits to be distinguished. The performance of these invariants is evaluated and compared to classical invariants. We verify that the invariants can distinguish all non-isomorphic graphs with 9 or fewer nodes. The invariants have also been applied to `classically hard' strongly regular graphs, successfully distinguishing all strongly regular graphs of up to 29 nodes, and preliminarily to weighted graphs. We have found that although it is possible to prepare states with a polynomial number of operations, the average number of preparations required to distinguish non-isomorphic graph states scales exponentially with the number of nodes. We have so far been unable to find operators which reliably compare graphs and reduce the required number of preparations to feasible levels. DOI: 10.1103/PhysRevA.100.052317.