Joan Vaccaro

Publications by Research Topic

Quantum states of light - squeezing

Amplifying squeezing light

J.A. Vaccaro and D.T. Pegg, "Squeezing of light by coherent attenuation", Optica Acta, 33, 1141-1147 (1986);
D.T. Pegg and J.A. Vaccaro, "Squeezing in the output of a high-gain atomic light amplifier", Optics Commun., 61, 317-320, (1987);
J.A. Vaccaro and D.T. Pegg, "Squeezed atomic light amplifiers", J. Mod. Optics, 34, 855-872 (1987).

Phase properties

J.A. Vaccaro and D.T. Pegg, "Phase properties of squeezed states of light", Optics Commun. 70, 529-534 (1989);
J.A. Vaccaro and D.T. Pegg, "Phase properties of optical linear-amplifiers", Phys. Rev. A, 49, 4985-4995 (1994);
J.A. Vaccaro and D.T. Pegg, "Nondiffusive phase dynamics from linear-amplifiers and attenuators in the weak-field regime", J. Mod. Optics 41, 1079-1086 (1994);
J.A. Vaccaro, S.M. Barnett and D.T. Pegg, "Phase fluctuations and squeezing", J. Mod. Optics 39, 603-614 (1992).

Pegg-Barnett Quantum Phase Operator

Minimum uncertainty states

J.A. Vaccaro and D.T. Pegg, "Physical number phase intelligent and minimum-uncertainty states of light", J. Mod. Optics 37, 17-29 (1990).

Generalized canonical observables

D.T. Pegg, J.A. Vaccaro and S.M. Barnett, "Quantum-optical phase and canonical conjugation", J. Mod. Optics 37, 1703 (1990).

Mathematical formalism

U. Leonhardt, J.A. Vaccaro, B. Bohmer and H. Paul, "Canonical and measured phase distributions", Phys. Rev. A 51, 84-95 (1995);
J.A. Vaccaro, "Phase operators on Hilbert-space", Phys. Rev. A 51, 3309-3317 (1995);
J.A. Vaccaro and R.F. Bonner, "Pegg-Barnett phase operators of infinite rank", Phys. Lett. A, 198, 167-174 (1995);
J.A. Vaccaro and Y. Benaryeh, "Antinormally ordering of phase operators and the algebra of weak limits", Optics Commun., 113, 427-432 (1995).

Wigner function for photon number and phase

J.A. Vaccaro and D.T. Pegg, "Wigner function for number and phase", Phys. Rev. A 41, 5156-5163 (1990);
J. Vaccaro, "Number-phase Wigner function on Fock space", Phys. Rev. A 52, 3474-3488 (1995);
J.A. Vaccaro, "New Wigner function for number and phase", Optics Commun. 113, 421-426 (1995).

General aspects of phase

J.A. Vaccaro and D.T. Pegg, "On measuring extremely small phase fluctuations", Optics Commun. 105, 335-340 (1994);
J.A. Vaccaro and D.T. Pegg, "Consistency of quantum descriptions of phase", Physica Scripta T48, 22-28 (1993);
J.A. Vaccaro and A. Orlowski, "Phase properties of Kerr media via variance and entropy as measures of uncertainty", Phys. Rev. A 51, 4172-4180 (1995);
A.R. Gonzalez, J.A. Vaccaro and S.M. Barnett, "Entropic uncertainty relations for canonically conjugate operators", Phys. Lett. A 205, 247-254 (1995).

Quantum nonlocality

Bell correlations and the Wigner function

U. Leonhardt and J.A. Vaccaro, "Bell correlations in phase-space - application to quantum optics", J. Mod. Optics, 42, 939-943 (1995).

Quantum state determination

Reconstructing the wave function

J.A. Vaccaro and S.M. Barnett, "Reconstructing the wave-function in quantum optics", J. Mod. Optics, 42, 2165-2171 (1995);
O. Steuernagel and J.A. Vaccaro, "Reconstructing the density operator via simple projectors", Phys. Rev. Lett. 75, 3201-3205 (1995) [arXiv:quant-ph/9510014].

Stochastic Schrödinger equations

From quantum jumps to quantum state diffusion

J.A. Vaccaro and D. Richards, "Stochastic Schrodinger equations for optical fields based on atom detection", Phys. Rev. A., 58 2690-2698 (1998).

Electromagnetically-induced transparency (EIT)

Transient EIT

H.X. Chen, A.V. Durrant, J.P. Marangos, and J.A. Vaccaro, "Observation of transient electromagnetically induced transparency in a rubidium Lambda system", Phys. Rev. A 58 1545-1548 (1998);
S.R. de Echaniz, A.D. Greentree, A.V. Durrant, D.M. Segal, J.P. Marangos and J.A. Vaccaro, "Observation of transient gain without population inversion in a laser-cooled rubidium Lambda system", Phys. Rev. A 64 055801 (2001);
A.D. Greentree, T.B. Smith, S.R. de Echaniz, A.V. Durrant, J.P. Marangos, D.M. Segal and J.A. Vaccaro, "Resonant and off-resonant transients in electromagnetically induced transparency: Turn-on and turn-off dynamics", Phys. Rev. A 65, 053802 (2002) [arXiv:quant-ph/0109090].

Hyperfine sublevels in laser cooled samples

A.V. Durrant, H.X. Chen, S.A. Hopkins, and J.A. Vaccaro, "Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium", Optics Commun., 151, 135-146 (1998).

4 and 5 level systems

A.D. Greentree, J.A. Vaccaro, S.R. de Echaniz, A.V. Durrant and J.P. Marangos, "Prospects for photon blockade in four-level systems in the N configuration with more than one atom",Journal of Optics B 2, 252-259 (2000) [ arXiv:quant-ph/0002091] ;
S.R. de Echaniz, A.D. Greentree, A.V. Durrant, D.M. Segal, J.P. Marangos and J.A. Vaccaro, "Observations of a doubly driven V system probed to a fourth level in laser-cooled rubidium", Phys Rev. A 64, 013812 (2001) [arXiv:quant-ph/0102098];
A.D. Greentree, D. Richards, J.A. Vaccaro, A.V. Durrant, S.R. de Echaniz, D.M. Segal and J.P. Marangos, "Intensity-dependent dispersion under conditions of electromagnetically induced transparency in coherently prepared multistate atoms", Phys Rev. A 67, 023818 (2002) [ arXiv:quant-ph/0209067 ].

Vector model of EIT

J.A. Vaccaro, A.V. Durrant, D. Richards, S.A. Hopkins, H.X. Chen and K.E. Hill, "Stochastic wavefunction diagrams for electromagnetically induced transparency, inversionless gain and shelving", J. Mod. Optics 45, 315-333 (1998).

Quantum Information Processing

Classical properties of quantum gates

J.A. Vaccaro, O. Steuernagel and S.F. Huelga, "A class of symmetric controlled quantum operations", J. Phys. A 34, 7057 (2001) [arXiv:quant-ph/0102015].

Quantum remote control

S.F. Huelga, J.A. Vaccaro, A. Chefles and M.B. Plenio, "Quantum remote control: Teleportation of unitary operations", Phys. Rev. A, 63 042303 (2001) [arXiv:quant-ph/0005061];
S.F. Huelga, M.B. Plenio and J.A. Vaccaro, "Remote control of restricted sets of operations: Teleportation of angles", Phys. Rev. A 65, 042316 (2002) [arXiv:quant-ph/0101110].

Quantum voting

J.A. Vaccaro, J. Spring and A. Chefles, "Quantum protocols for anonymous voting and surveying", Phys. Rev. A 75, 012333 (2007) [arXiv:quant-ph/0504161].

Quantum source coding (data compression)

Y. Mitsumori, J.A. Vaccaro, S.M. Barnett, E. Andersson, A. Hasegawa, M. Takeoka and M. Sasaki, "Experimental demonstration of quantum source coding", Phys. Rev. Lett. 91, 217902 (2003) [arXiv:quant-ph/0304036];
GB Patent 2400252 A, 6 April 2005, Japan Patent 3858067, 29 September 2006, US Patent 07403713 B2, 22 July 2008.

Robust states of open quantum systems

Quantum state of Bose-Einstein condensates and atom lasers

S.M. Barnett, K. Burnett and J.A. Vaccaro, "Why a condensate can be thought of as having a definite phase", Journal of Research of the National Institute of Standards and Technology 101, 593 (1996);
H.M. Wiseman and J.A. Vaccaro, "Atom lasers, coherent states, and coherence. I. Physically realizable ensembles of pure states", Phys. Rev. A 65, 043605 (2002) [arXiv:quant-ph/9906125];
H.M. Wiseman and J.A. Vaccaro, "Atom lasers, coherent states, and coherence II. Maximally robust ensembles of pure states", Phys. Rev. A 65, 043606 (2002) [arXiv:quant-ph/0112145].

Robust states as the preferred ensemble

H.M. Wiseman and J.A. Vaccaro, "Maximally Robust Unravelings of Quantum Master Equations", Phys. Lett. A 250, 241-248 (1998) [arXiv:quant-ph/9709014];
H.M. Wiseman and J.A. Vaccaro, "Inequivalence of pure state ensembles for open quantum systems: The preferred ensembles are those that are physically realizable", Phys. Rev. Lett. 87, 240402 (2001) [arXiv:quant-ph/0112115].

Superselection Rules, Reference Systems and Entanglement

Effect on quantum entanglement

H.M. Wiseman and J.A. Vaccaro, "Entanglement of indistinguishable particles shared between two parties" Phys. Rev. Lett. 91, 097902 (2003) [arXiv:quant-ph/0210002];
J.A. Vaccaro, F. Amselmi and H.M. Wiseman, "Entanglement of identical particles and reference phase uncertainty", Int. J. Quant. Inf. 1, 427 (2003) [arXiv:quant-ph/0311028].

Reference Ability

S.J. Jones, H.M. Wiseman, S.D. Bartlett, J.A. Vaccaro and D.T. Pope, "Entanglement and symmetry: A case study in superselection rules, reference frames, and beyond" Phys. Rev. A 74, 062313 (2006) [arXiv:quant-ph/0608056];
J.A. Vaccaro, F. Amselmi, H.M. Wiseman and K. Jacobs, "Trade off between the locally extractable work, accessible entanglement and local reference frame ability for bipartite systems", Phys. Rev. A 77, 032114 (2008) [arXiv:quant-ph/0501121];
G. White, J.A. Vaccaro and H.M. Wiseman, "The consumption of reference resources", AIP Conference Proceedings 1110, 11-22 (2009) [arXiv:0811.3660].
J.A. Vaccaro, S. Croke and S.M. Barnett, "Is coherence catalytic?", J.Phys. A 51, 414008 (2018).

Optimal reference states

G. White, J.A. Vaccaro and H.M. Wiseman, "Optimal reference states for maximum accessible entanglement under the local-particle-number superselection rule", Phys. Rev. A 79, 032109 (2009) [arXiv:0807.0064].

Particle-wave Duality and Complementarity

Particle-wave duality

J.A. Vaccaro, "Group Theoretic Formulation of Complementarity" Proceedings of the 8th International Conference on Quantum Communication, Measurement and Computing, Edited by O. Hirota et al. (NICT, Tokyo, 2006) [arXiv:1012.3532].
J.A. Vaccaro, "Particle-wave duality: a dichotomy between symmetry and asymmetry", Proc. R. Soc. Lond. A 468, 1065-1084 (2012) [arXiv:1105.0083]

Foundations of Thermodynamics

Information erasure without an energy cost

J.A. Vaccaro and S.M. Barnett, "The cost of erasing information", AIP Conference Proceedings 1110, 37-40 (2009).
J.A. Vaccaro and S.M. Barnett, "Information erasure without an energy cost", Proc. R. Soc. Lond. A 467, 1770-1778 (2011) [arXiv:1004.5330].
S.M. Barnett and J.A. Vaccaro, "Beyond Landauer erasure", Entropy, 15, 4956-4968 (2013).
T. Croucher, S. Bedkihal and J.A. Vaccaro, "Discrete Fluctuations in Memory Erasure without Energy Cost", Phys. Rev. Lett. 118, 060602 (2017).
J.S.S.T. Wright, T. Gould, A.R.R. Carvalho, S. Bedkihal and J.A. Vaccaro, "Quantum heat engine operating between thermal and spin reservoirs", Phys. Rev. A 97, 052104 (2018).
T. Croucher, J.S.S.T. Wright, A.R.R. Carvalho, S.M. Barnett and J.A. Vaccaro, "Information Erasure", Chapter 29 in F. Binder et al. (eds.), Thermodynamics in the Quantum Regime (Springer Nature, Switzerland AG, 2019). [arxiv:1803.08619]
T. Croucher and J.A. Vaccaro, "Thermodynamics of memory erasure via a spin reservoir", Phys. Rev. E 103, 042140 (2021) [arXiv:2011.06438].

Long range correlations

S.N. Saadatmand, T. Gould, E.G. Cavalcanti, and J.A. Vaccaro, "Thermodynamics from first principles: Correlations and nonextensivity", Phys. Rev. E 101, 060101 (2020) [arXiv:1907.01855].

Physical Nature of Time

Unidirectionality of time

J.A. Vaccaro, "Unidirectionality of time induced by T violation", J. Phys.: Conf. Ser. 306, 012057 (2011).
J.A. Vaccaro, "T Violation and the Unidirectionality of Time", Found. Phys. 41, 1569-1596 (2011) [arXiv:0911.4528].
J.A. Vaccaro, "T Violation and the Unidirectionality of Time: further details of the interference ", Found. Phys.45, 691-706 (2015) [arXiv:1503.06523].

Origin of dynamics

J.A. Vaccaro, "Quantum asymmetry between time and space", Proc. R. Soc. Lond. A 472, 20150670 (2016).
J.A. Vaccaro,"An anomaly in space and time and the origin of dynamics", in S. Wuppuluri, G. Ghirardi Eds, "Space, Time and the Limits of Human Understanding" (Springer International, 2016) p 185-201.
J.A. Vaccaro, "The quantum theory of time, the block universe, and human experience", Phil. Trans. R. Soc. Lond. A 376, 20170316 (2018).