arXiv subjects

Xuemei Su

Publications and source records attributed to Xuemei Su.

3 recordsLinked to original sources

arXiv2019

Phase-dependent quantum correlation in cavity-atom system

We propose a scheme to manipulate quantum correlation of output lights from two sides of a cavity by phase control. A probe laser is set to split into two beams in an interferometer with a relative phase in two arms which drive the cavity mode in opposite directions along cavity axis, individually. This phase, here named as driving-field phase, is important to build up quantum correlation in HBT (Hanbury Brown-Twiss) setup. Three control lasers propagate vertically to the cavity axis and drive the corresponding atomic transitions with a closed-loop phase. This type of closed-loop phase has been utilized to realize quantum correlation and even quantum entanglement of the atomic system in previous work [Phys. Rev. A 81 033836 (2010)]. The scheme here is useful to manipulate steady and maximum quantum correlation.

quant-ph↗

arXiv2018

Absorption interferometer based on phase modulation

We propose a scheme in which an arbitrary incidence can be made perfectly reflected/transmitted if a phase setup is adjusted under a specific condition. We analyze the intracavity field variation as well as the output field with changing closed-loop phase of atomic system and relative phase of input probe beams. And we obtain the condition for perfect transmitter or reflector. By adjusting two phase setups, the medium absorption and light interference can be controlled so that photon escape from cavity can be modulated, thus the intensity switching based on phase control can be realized. Then based on the transmission/reflection analysis, total absorption of this system can be investigated. Therefore our scheme can be used as an absorption interferometer to explore the optical absorption in some complicated system. The phase delay dependent on phi_1 or phi_2 in output light intensity can be applied in the realization of quantum phase gate and subtle wave filter. And based on this scheme, we implement the state transfer between perfect transmitter/reflector and non-perfect coherent photon absorber via relative-phase modulation.

quant-ph↗

arXiv2018

Optical switch based on dressed intracavity dark states

We present a scheme to realize two-direction optical switch by a single-mode optical cavity containing some four-level atoms. The high switching efficiency can be obtained through low photon loss and large third-order nonlinear susceptibility of this N-type atomic system in cavity. Without the microwave source, it can be reduced to an atomic system where a coupling laser is used to realize single electromagnetically induced transparency. Namely, the probe field can be transmitted almost totally at resonance. Thus a two-direction optical switch is operated and the state for forward (backward) direction is set as open (closed). When microwave source is introduced, dressed splitting of dark state happens. The probe field is reflected almost completely at resonance and the state of the optical switch at forward and backward directions (transmitted and reflected channels) is shifted as closed and open, respectively. Moreover, this scheme is much advantageous to realize splitting of dark state because weak microwave field induces the coupling between dark state and one sub-level of ground state. While a strong pump laser which couples dark state with an excited level is applied to realize this splitting in Ref. [Phys. Rev. A 85 013814 (2012)].

physics.optics↗