Broadband phase-noise squeezing of traveling waves in electromagnetically induced transparency
| Autor: | Marlan O. Scully, Michael Fleischhauer, Ulrich W. Rathe |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Physical Review A. 54:3691-3694 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.54.3691 |
| Popis: | In the course of the search for sources of bright phasesqueezed light we recently suggested the utilization of electromagnetically induced transparency @1#. The proposed setup was based on an atomic L scheme driven on one transition as in the experiments of Harris and co-workers @2‐5# ~see Fig. 1!. A medium consisting of such atoms placed inside a cavity was shown to reduce the phase noise of an injected field up to 50% ~in the output of the cavity! under optimum conditions. The use of cavity setups has, however, technical drawbacks ~necessity of correct frequency locking, etc.! and leads to a noise reduction only in a relatively narrow band determined by the cavity width. In the present report we show that squeezing is also possible in a traveling-wave configuration. If we shine traveling-wave laser light onto a cell containing the transparent medium, the input light is shown to be phase squeezed up to about 41% at the output under optimum conditions. The bandwidth of noise reduction is thereby determined by the width of the L resonance which, in the case of strong driving, is the Rabi frequency of the driving field. The method we employ to obtain a propagation equation for the mean value and the fluctuations of the probe field closely follows the formulation of Ref. @8# based on the original approach of Ref. @9#. In exactly the same way as described in Ref. @8#, we define a slowly varying space- and time-dependent field annihilation operator a(z,t) that obeys the propagation equation |
| Databáze: | OpenAIRE |
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