TY - JOUR

T1 - Cavity-assisted squeezing and entanglement

T2 - Non-adiabatic effects and optimal cavity-atomic ensemble matching

AU - Masalaeva, N. I.

AU - Vetlugin, A. N.

AU - Sokolov, I. V.

PY - 2020/3

Y1 - 2020/3

N2 - We investigate theoretically quantum entanglement of light with the collective spin polarization of a cold atomic ensemble in cavity-assisted Raman schemes. Previous works concentrated mostly on the bad cavity limit where the signals are much longer than the cavity field lifetime. In view of atomic relaxation and other imperfections, there may arise a need to speed-up the light-atoms interface operation. By increasing the cavity field lifetime, one can achieve better light-matter coupling and entanglement. In our work, we consider the non-adiabatic effects that become important beyond the bad cavity limit in both low-photon and continuous variables regime. We find classical control field time profiles that allow one to retrieve from the cavity an output quantized signal of a predefined time shape and duration, which is optimal for the homodyne detection, optical mixing or further manipulation. This is done for a wide range of the signal duration as compared to the cavity field lifetime. We discuss an optimal cavity-atomic ensemble matching in terms of the cavity field lifetime which allows one to apply less intense control field and to minimize a variety of nonlinear effects, such as AC light shifts, four-wave mixing, etc, which may be potentially harmful to an experiment.

AB - We investigate theoretically quantum entanglement of light with the collective spin polarization of a cold atomic ensemble in cavity-assisted Raman schemes. Previous works concentrated mostly on the bad cavity limit where the signals are much longer than the cavity field lifetime. In view of atomic relaxation and other imperfections, there may arise a need to speed-up the light-atoms interface operation. By increasing the cavity field lifetime, one can achieve better light-matter coupling and entanglement. In our work, we consider the non-adiabatic effects that become important beyond the bad cavity limit in both low-photon and continuous variables regime. We find classical control field time profiles that allow one to retrieve from the cavity an output quantized signal of a predefined time shape and duration, which is optimal for the homodyne detection, optical mixing or further manipulation. This is done for a wide range of the signal duration as compared to the cavity field lifetime. We discuss an optimal cavity-atomic ensemble matching in terms of the cavity field lifetime which allows one to apply less intense control field and to minimize a variety of nonlinear effects, such as AC light shifts, four-wave mixing, etc, which may be potentially harmful to an experiment.

KW - quantum entanglement

KW - cavity QED

KW - nonlinear light-matter interaction

KW - QUANTUM

KW - GENERATION

UR - http://www.scopus.com/inward/record.url?scp=85079878038&partnerID=8YFLogxK

U2 - 10.1088/1402-4896/ab52a2

DO - 10.1088/1402-4896/ab52a2

M3 - Article

AN - SCOPUS:85079878038

VL - 95

JO - Physica Scripta Topical Issues

JF - Physica Scripta Topical Issues

SN - 0031-8949

IS - 3

M1 - 034009

ER -