Synchronous Quantum Memories with Time-symmetric Pulses

TL;DR

This paper introduces a dynamical quantum memory approach using a synchronized oscillator-cavity system with time-shaped coupling, enabling high-fidelity storage of time-symmetric pulses across various media.

Contribution

It presents a novel method for quantum memory that optimizes interface matching with symmetric pulses through temporal modulation, applicable to diverse linear storage systems.

Findings

Achieves high quantum input-output fidelity with long storage times

Enables mode-matching to time-symmetric pulses via temporal coupling modulation

Applicable to a wide range of linear quantum storage media

Abstract

We propose a dynamical approach to quantum memories using a synchronous oscillator-cavity model, in which the coupling is shaped in time to provide the optimum interface to a symmetric input pulse. This overcomes the known difficulties of achieving high quantum input-output fidelity with storage times long compared to the input signal duration. Our generic model is applicable to any linear storage medium ranging from a superconducting device to an atomic medium. We show that with temporal modulation of coupling and/or detuning, it is possible to mode-match to time-symmetric pulses that have identical pulse shapes on input and output.