Obtaining phase-optimized states from superpositions of coherent states in phase-sensitive attenuating/amplifying reservoirs

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Annals of Physics

DOI:https://doi.org/10.1016/J.AOP.2019.03.027· OSTI ID:22848417

Ferreira, C. J.S. ^[1]; Malbouisson, J. M.C., ^[2]

---

1. Departamento de Física, Universidade Federal da Paraíba, 58.051-970 João Pessoa, PB (Brazil)
2. Instituto de Física, Universidade Federal da Bahia, 40210-340 Salvador, BA (Brazil)

In this paper we present new nonclassical states of a single mode of the electromagnetic field constructed by superpositions of coherent states distributed over a semi-straight line starting from the origin of the phase space. These states have highly concentrated phase distributions and can be useful as approximations of phase states. We propose feasible schemes to prepare such states in microwave high-Q cavities and as traveling modes. We investigate nonclassical properties and determine the Wigner functions of such pure states. Then we consider the system in contact with a reservoir, taking into account dissipation and gain processes in the Markovian approximation, and study the time-evolution of these states by solving the master equation in the Wigner representation. From explicit expressions of the time-dependent Wigner functions, we study the time-dependence of nonclassical properties and use the negativity of the Wigner function to analyze the disappearance of sub-Planck structures as time evolves.

• OSTI ID: 22848417
• Journal Information: Annals of Physics, Vol. 406; Other Information: © 2019 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-4916
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION OPERATORS
APPROXIMATIONS
DISTRIBUTION
EIGENSTATES
ELECTROMAGNETIC FIELDS
MARKOV PROCESS
MICROWAVE RADIATION
PHASE SPACE
PURE STATES
TIME DEPENDENCE
WIGNER THEORY