Abstract
We have found a new hidden symmetry of time reversal light–atom interaction in the photon echo quantum memory with Raman atomic transition. The time-reversed quantum memory creates generalized conditions for the ideal compression/decompression of time duration of the input light pulses and its wavelength. Based on a general analytical approach to this scheme, we have studied the optimal conditions for the light field compression/decompression in resonant atomic systems characterized by realistic spectral properties. The demonstrated necessary conditions for the effective quantum conversion of the light waveform and wavelength are also discussed for various possible realizations of the quantum memory scheme. The performed study promises new capabilities for fundamental study of the light–atom interaction and deterministic quantum manipulation of the light field, significant for quantum communication and quantum computing.
Highlights
Time reversal dynamics of light and multiatomic systems is in the heart of the long-term investigation related to the background of classical and quantum thermodynamics [1], CPT symmetry [2], symmetry of quantum mechanics and electrodynamics equations [3]
Main idea of the proposed deterministic quantum waveform conversion is based on the observed scalable time reversal (STR) symmetry of the light-atom dynamics inherent to the absorption of input light field and subsequent echo emission in the off resonant Raman echo quantum memory (QM)
The observed STR symmetry is a new type of discrete symmetry for the light-atoms dynamics which arises in the medium with controlled spectral properties of resonant atoms
Summary
Time reversal dynamics of light and multiatomic systems is in the heart of the long-term investigation related to the background of classical and quantum thermodynamics [1], CPT symmetry [2], symmetry of quantum mechanics and electrodynamics equations [3]. The original scheme of photon echo quantum memory (PEQM) [19] has been proposed in the framework of the light-atom interaction characterized by the perfect time reversal of the input signal field absorption in the photon echo emission It has been clearly recognized in detailed study [20], generalized to nonlinear regime of the light atom interaction [21] and demonstrated [22] by observation of hidden symmetry of the light-atom equations (referred in this paper as CRIB-protocol, see the review [23]). More significant increase of unitary light pulse compression ( generally referred to as quantum waveform conversion) has been found for three-wave mixing of the signal light pulse with additional chirped light fields [30, 31] These results have stimulated the study for new capabilities and improvements of c/d-PEQM technique where the quantum storage could be supplemented with deterministic manipulation of the quantum light fields. We shown a strategy for switching control laser fields providing high quantum efficiency of the studied QM scheme
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