Multi-pulse addressing of a Raman quantum memory: configurable beam splitting and efficient readout

TL;DR

This paper demonstrates a Raman quantum memory system that uses multiple control pulses to achieve configurable beam splitting and high-efficiency readout, advancing scalable photonic quantum information processing.

Contribution

It introduces a multi-pulse addressing technique for Raman quantum memories, enabling dynamic beam splitting and efficient readout for scalable quantum networks.

Findings

Achieved large time-bandwidth product in quantum memory

Demonstrated configurable beam splitter functionality

Enabled high-efficiency quantum memory readout

Abstract

Quantum memories are vital to the scalability of photonic quantum information processing (PQIP), since the storage of photons enables repeat-until-success strategies. On the other hand the key element of all PQIP architectures is the beam splitter, which allows to coherently couple optical modes. Here we show how to combine these crucial functionalities by addressing a Raman quantum memory with multiple control pulses. The result is a coherent optical storage device with an extremely large time-bandwidth product, that functions as an array of dynamically configurable beam splitters, and that can be read out with arbitrarily high efficiency. Networks of such devices would allow fully scalable PQIP, with applications in quantum computation, long-distance quantum communications and quantum metrology.