On single-mode - and V-type micromasers: quantum interference versus photon statistics (original) (raw)
Related papers
Photon amplification in a two-photon lossless micromaser
Physical Review A, 1994
We investigate the interaction of atoms through two-photon resonant transitions, with quantized cavity radiation, in the framework of a lossless micromaser theory. Taking advantage of the fact that the atomic inversion is quasiregular in time in this model, with quite precise revivals, we find a very strong amplification of the average photon number. At the two-photon revival time, the atom leaves the cavity in an almost pure state. This leads to an essentially noise-free process that results in a shift of two photons of the initial photon distribution each time an atom passes through the cavity, while the width of the photon distribution remains constant. This leads to strongly sub-Poissonian field statistics.
Quantum phase properties of the field in a two-photon micromaser
Optics Communications, 2008
In this paper, we study the quantum phase properties of the field in a two-photon micromaser, including the effects of the finite detuning of the intermediate level. For initial coherent state of the cavity field and atoms initially in their excited state multipeak phase structure appears which eventually leads to the randomization of the cavity field phase. However, the approach towards the randomization depends upon the detuning. If the atoms are injected in a coherent superposition of their upper and lower atomic states then the phase distribution evolves into two-peak structure. For initial thermal state and atoms in polarized state, cavity field acquires some phase. We also consider the effect of finite Q of the cavity, random injection of the atoms and fluctuations in the interaction time.
Transfer of coherence from atoms to mixed field states in a two-photon lossless micromaser
Journal of Modern Optics, 1999
We propose a two-photon micromaser-based scheme for the generation of a nonclassical state from a mixed state. We conclude that a faster, as well as a higher degree of field purity is achieved in comparison to one-photon processes. We investigate the statistical properties of the resulting field states, for initial thermal and (phase-diffused) coherent states. Quasiprobabilities are employed to characterize the state of the generated fields.
Trapping and photon number states in a two-photon micromaser
Journal of Luminescence, 1998
We present a theoretical analysis of a two-photon micromaser and investigate the statistical properties of the radiation. We analyze both vacuum as well as non-vacuum trapped states that follow from the theory. Non-vaccum trapped states have not been found in previous theories of the two-photon micromaser. We explore how photon number states can be generated in the limit of large flux of atoms in the cavity.
Role of spatial mode function in the presence of two-atom events in a micromaser
Optics Communications, 2007
In this paper, we discuss the effects of spatial mode function in an one-photon micromaser in the presence of two-atom events. It is shown that two-atom events allow us a possibility to study the effects of different cavity eigenmodes in a micromaser. We find that squeezing properties of the radiation field depend upon the parity (odd or even) and order (lower or higher) of cavity eigenmodes. For example, squeezing can be obtained for odd-order cavity eigenmodes which completely vanishes for even-order modes. Our results also show that effects similar to self-induced transparency are never obtained in the presence of two-atom events. Finally, we consider the effect of pump fluctuations and cavity losses in our system.
Quantum interference and atom-atom entanglement in a two-mode, two-cavity micromaser
Physical Review A, 1999
The interaction of two-level atoms with two modes of a resonator, formed by two weakly coupled cavities, is investigated. The first atom, passing through one of the two cavities, excites the two field modes. The second atom then, passing through the other cavity, tests the excitation. Since the photon generated by the first atom may be in the first or the second cavity, quantum interference phenomena are observed. Furthermore, the setup can be used to generate maximum entangled pairs of atoms. ͓S1050-2947͑99͒08709-0͔
The European Physical Journal D, 2005
In this paper we propose a theoretical scheme to show the possibility of generating various families of nonlinear (f-deformed) coherent states of the radiation field in a micromaser. We show that these states can be provided in a lossless micromaser cavity under the weak Jaynes-Cummings interaction with intensity-dependent coupling of large number of individually injected two-level atoms in a coherent superposition of the upper and lower states. In particular, we show that the so-called nonlinear squeezed vacuum and nonlinear squeezed first excited states, as well as the even and odd nonlinear coherent states can be generated in a two-photon micromaser.
Applied Mathematics & Information Sciences, 2014
We investigate the transfer of coherence from atoms to a cavity field initially in a statistical mixture within a two-photon micromaser arrangement. The field is progressively modified from a maximum entropy state (thermal state) towards an almost pure state (entropy close to zero) due to its interaction with atoms sent across the cavity. We trace over the atomic variables, i.e., the atomic states are not measured and recorded by a detector after they leave the cavity. We show that by applying an external classical driving field it is possible to substantially increase the field purity without the need of previously preparing the atoms in a superposition of their energy eigenstates. We also discuss some of the nonclassical statistical properties of the resulting field.
Generation of macroscopic photonic quantum superpositions by two-photon processes
2001
The dynamics of a two-photon Hamiltonian is used to generate a macroscopic, pure quantum superposition of the electromagnetic field composed of a squeezed vacuum state plus an orthogonal, odd photon numbers state. We consider the injection in a single-mode, lossless optical cavity of a monoenergetic, low-density beam of three-level atoms in a coherent state. Conditions are obtained on the interaction time and the detuning parameter of the mid level of the three-level atom for the realization of the quantum superposition. The new odd photon numbers state, which is not a squeezed state, exhibits non-classical properties such as sub-Poissonian and super-Poissonian photon statistics.