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Physical Review A

Effect of finiteQon squeezed states in a micromaser

Shahid Qamar, Muhammad Suhail Zubairy

Published Aug 1, 1993• 13 citations
Publisher

Abstract

The squeezing properties of the radiation field in a micromaser are analyzed. In particular, we consider the effect of finite Q on the steady-state squeezing inside the cavity. We also discuss the effect of pump fluctuations on squeezing and show that the regularization of pumping may lead to an increase in the steady-state squeezing.
DOI
10.1103/physreva.48.1559

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Acta Sinica Quantum Optica•Jan 1, 2004•0 citations
We have studied the effect of pump phase fluctuations on steady-state squeezing in a one-photon micromaser for the case of both high- and low (finite)- Q cavities. Our system involves the preparation of a gain medium (atoms) in a partial coherent superposition of states, due to the finite linewidth of the pump field, before injecting them into the microwave cavity. We have found that even in the presence of a finite value of pump phase fluctuations we obtain 40% squeezing for high Q , which reduces to 25% for finite Q . In the absence of pump phase fluctuations we obtain 55% squeezing, in agreement with the previous work.
We present a study on the quantum statistical properties of radiation in a one-photon micromaser. In particular, the possibility of generating steady-state squeezing is investigated. The spectral properties of the radiation field in a micromaser are also studied. \n \nWe show that the steady-state squeezing can be generated in a lossless micromaser by injecting the atoms in a coherent superposition of upper and lower states. It is shown by considering initial vacuum number and thermal state of the cavity field, that for a particular choice of the interaction time field evolves to a squeezed state. Steady- state squeezing is found to be independent of the initial state of the cavity field. However, the temporal evolution of the squeezing depends on the initial state of the field. Effects of cavity losses and pump fluctuations on steady-state squeezing are also investigated. \n \nFinally, an exact analytic expression for the linewidth of a micromaser in the absence of cavity losses is obtained by evaluating the two-time correlation function. A comparison with the natural linewidth of laser shows that under certain conditions gain contribution to the linewidth is same in both the cases. We also, derive an exact expression for the phoston distribution function and show that for a particular choice of the interaction time, the number state of the field can be generated.
The generation of the steady state fourth-order squeezing and squared amplitude squeezing in a micromaser by the coherent trapping approach is investigated. The results show that if two-level atoms injected into the cavity are initially in coherent state and the flight time of the atoms inside the cavity satisfies the trapping condition, the field can evolve into a coherent trapping state which exhibits steady state fourth-order squeezing and squared amplitude squeezing in the cavity as long as the flux of the atoms is moderately large.