Nonclassicality of quantum excitation of classical coherent fields in thermal environments

Abstract

The nonclassicality of photon-added coherent fields in the thermal channel is investigated by exploring the volume of the negative part of the Wigner function which reduces with the dissipative time. The Wigner functions become positive when the decay time exceeds a threshold value. For the case of the single photon-added coherent state, we derive the exact threshold values of decay time in the thermal channel. For arbitrary partial negative Wigner distribution function, a generic analytical relation between the mean photon number of heat bath and the threshold value of decay time is presented. Finally, the possible application of SPACSs in quantum computation has been briefly discussed. OCIS codes: 270.0270, 270.2500, 000.5490

10 pages, 5 figures, three references are added, and a brief discussion of the possible applications of SPACSs in quantum information processes has been added; Accepted by JOSA B

References in corpus (5)

• A computable measure of nonclassicality for light
• Single-photon excitation of a coherent state: catching the elementary step of stimulated light emission
• Nonclassicality and decoherence of photon-subtracted squeezed states
• Nonclassicality of quantum excitation of classical coherent field in photon loss channel
• Homodyne Detection and Quantum State Reconstruction

Cited by in corpus (3)

• Generation and Characterization of Tailored MIR Waveforms for Steering Molecular Dynamics
• Nonclassicality of single quantum excitation of a thermal field in thermal environments
• Mean parity of single quantum excitation of some optical fields in thermal environments