Quantum theory of the micromaser: Symmetry breaking via off-diagonal atomic injection

Krause, Joachim; Scully, Marlan O.; Walther, H.

doi:10.1103/physreva.34.2032

Cited by 123 publications

(37 citation statements)

References 6 publications

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“…It is worth noting that when the atoms initially possess some quantum coherence [24,25], the "thermalized state" of the cavity field will carry the information of this coherence. Actually, quantum coherence has been proved to be a kind of resource to enhance quantum information processing.…”

Section: Introductionmentioning

confidence: 99%

Single-particle machine for quantum thermalization

2010

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The long time accumulation of the random actions of a single particle "reservoir" on its coupled system can transfer some temperature information of its initial state to the coupled system. This dynamic process can be referred to as a quantum thermalization in the sense that the coupled system can reach a stable thermal equilibrium with a temperature equal to that of the reservoir. We illustrate this idea based on the usual micromaser model, in which a series of initially prepared two-level atoms randomly pass through an electromagnetic cavity. It is found that, when the randomly injected atoms are initially prepared in a thermal equilibrium state with a given temperature, the cavity field will reach a thermal equilibrium state with the same temperature as that of the injected atoms. As in two limit cases, the cavity field can be cooled and "coherently heated" as a maser process, respectively, when the injected atoms are initially prepared in ground and excited states. Especially, when the atoms in equilibrium are driven to possess some coherence, the cavity field may reach a higher temperature in comparison with the injected atoms. We also point out a possible experimental test for our theoretical prediction based on a superconducting circuit QED system.

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Section: Introductionmentioning

confidence: 99%

Single-particle machine for quantum thermalization

2010

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“…In the Appendix we consider this issue from the point of view of injected atomic coherence using the model in Ref. [26]. There we find that if the field in the first cavity is strong, so that the interaction time is of the order of the inverse Rabi frequency, then the velocity spread does lead to a mild suppression of the coherence between the fields.…”

Section: Phase Diffusiqnmentioning

confidence: 95%

Pump-coupled masers: Transient regime

Bergou¹,

Hillery²

1991

Phys. Rev. A

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We consider a system of two masers that are pumped by the same beam of excited atoms. The atoms pass first through one maser and then through the other. As a result, the first maser modifies the pump going into the second and an effective coupling results. We examine this system in the amplifier configuration, i.e. , we do not consider saturation effects. The fields in the two masers are mutually coherent and can, under the proper circumstances, be free of noise in their relative phase. Therefore this system exhibits behavior similar to that of a correlated-emission laser. We also find that the photon number in the second maser grows faster than that in the first. These effects should be observable even if the pump beam has a finite velocity spread. PACS number(s): 42.50.p, 03.65.w, 42.52. +x

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“…As seen from the relation (21) between the (p + 1)th term and the pth term in the sum in Eq. It should be mentioned here that the possibilities for generation of coherent states of the fields in the micromaser 1-1, 5] and laser [1][2][3][4] with injected atomic coherence have been shown previously. The master equation (7) + -4 a + a a + p a -4 a + p a a + a ) where r is the injection rate.…”

Section: P! ( N -P ) ! (N'--p)! ( N -N --N ' + P)! (N -P)(n' -P)mentioning

confidence: 99%

Generation of a coherent state of the micromaser field

1993

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It is found that a coherent state of the cavity field can be generated in a micromaser with injected atoms in a coherent superposition of the upper and lower states. The dependence of the density matrix elements of the field on the number of injected atoms indicates that due to the same initial atomic coherence the emission of separately injected single atoms in the cat, ity is a cooperative process.The production of a coherent state of the radiation field is generally associated with a classical current, e.g., an electronic current such as drives a klystron. In ordinary laser devices the phase of the radiation field is unknown and the radiation field density matrix is diagonal. Attempting to overcome this phase uncertainty in previous work, we have injected atoms prepared in a coherent superposition of states ~1) or injected an external symmetry-breaking field, i.e., a field of specific phase. (2'3) It is clear from the master equation obtained in the paper by Krause, Scully, and Walther (~) that under the condition of weak atom-field interaction a coherent state of the field in a lossless micromaser with injected atomic coherence may be generated. Recently, Lu and Bergou (4) have found that a laser with injected atomic coherence under very specific conditions can produce a field state I 1 Dedicated to Prof. Asim Barut on the occasion of his 65th birthday. Physicist, philosopher, friend of man, here indeed is a role model for us all.

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Quantum theory of the micromaser: Symmetry breaking via off-diagonal atomic injection

Cited by 123 publications

References 6 publications

Single-particle machine for quantum thermalization

Single-particle machine for quantum thermalization

Pump-coupled masers: Transient regime

Generation of a coherent state of the micromaser field

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