Scalable time reversal of Raman echo quantum memory and quantum waveform conversion of light pulse

TL;DR

This paper introduces a new symmetry in Raman-based photon echo quantum memory enabling efficient light pulse compression, decompression, and wavelength conversion, advancing quantum communication and computing capabilities.

Contribution

It reveals a hidden symmetry in time reversal light-atom interaction and develops an analytical framework for optimal quantum waveform and wavelength conversion.

Findings

Identifies a new symmetry in light-atom interaction.

Derives conditions for ideal pulse compression and decompression.

Proposes methods for effective quantum waveform conversion.

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 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.