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Massachusetts Institute of Technology eBooks

Theoretical and experimental aspects of squeezed state generation in two-level media

Seng‐Tiong Ho

Published Jan 1, 1989• 0 citations
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The realization of a compact squeezed-state-generation device at 1.5 µm may have potential applications in optical communication. The squeezed state has been generated in both χ(2) and χ(3) media. In χ(2) media the frequency of the squeezed vacuum is half that of the pump. Therefore frequency doubling is necessary for generating a local oscillator (LO). Such frequency doubling is not needed in χ(3) media. However, squeezing in y(3) media has not been as successful as in X(2) media, for example, in atomic vapor,1 self-focusing seriously limits the amount of squeezing, whereas in optical fibers,2 guided-acoustic-wave Brillouin-scattering (GAWBS) noise causes difficulties that can be circumvented through low- temperature cooling of the fiber or the use of soli ton pulses.

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GENERATION OF SQEEZING IN TWO-PHOTON THREE-LEVEL MEDIA

Sunghyuck An, Murray Sargent

In this summary we extend the quantum theory of multiwave mixing by Holm and Sargent1,2 to a three-level cascade model with a two-photos pump and apply the results to the generation of squeezed states. The experimental observation of the suppresion of amplified spontaneous emission by the four-wave mixing process in this model has been reported by Malcuit, Gauthier, and Boyd.3 This experiment has been interpreted semiclassically by the same authors4 and quantum mechanically by Agarwal.5 Agarwal also has shown the generation of squeezed states in this model, but simplified his treatment by ignoring the spontaneous emission to and from the intermediate level. In contrast our treatment allows for arbitrary detunings of a classical pump and quantized sidemode fields, and includes a complete treatment of spontaneous emission.

•Jul 18, 1988•0 citations
The realization of a compact squeezed-state-generation device at 1.5 µm may have potential applications in optical communication. The squeezed state has been generated in both χ(2) and χ(3) media. In χ(2) media the frequency of the squeezed vacuum is half that of the pump. Therefore frequency doubling is necessary for generating a local oscillator (LO). Such frequency doubling is not needed in χ(3) media. However, squeezing in y(3) media has not been as successful as in X(2) media, for example, in atomic vapor,1 self-focusing seriously limits the amount of squeezing, whereas in optical fibers,2 guided-acoustic-wave Brillouin-scattering (GAWBS) noise causes difficulties that can be circumvented through low- temperature cooling of the fiber or the use of soli ton pulses.
This chapter reviews theoretical and experimental aspects of non-classical states of light, e.g., squeezed states and number states. The definition of squeezed states and a review of their general properties is followed by a discussion of special kinds of squeezing, e.g., squeezed coherent states, displaced squeezed states, and amplitude or phase squeezing. An overview of photon counting statistics and robustness of squeezed states is followed by a theoretical model of their generation and a description of their experimental production. The chapter ends with a brief discussion of the experimental generation of number states, including methods for generation of single-photon states on demand, which have applications to quantum information processing.
In this summary we extend the quantum theory of multiwave mixing by Holm and Sargent1,2 to a three-level cascade model with a two-photos pump and apply the results to the generation of squeezed states. The experimental observation of the suppresion of amplified spontaneous emission by the four-wave mixing process in this model has been reported by Malcuit, Gauthier, and Boyd.3 This experiment has been interpreted semiclassically by the same authors4 and quantum mechanically by Agarwal.5 Agarwal also has shown the generation of squeezed states in this model, but simplified his treatment by ignoring the spontaneous emission to and from the intermediate level. In contrast our treatment allows for arbitrary detunings of a classical pump and quantized sidemode fields, and includes a complete treatment of spontaneous emission.