Noise resilient quantum interface based on QND interaction

TL;DR

This paper introduces a noise-resilient quantum interface protocol utilizing QND interactions for perfect, deterministic state transfer between light and matter systems, applicable in quantum memory and sensing.

Contribution

It presents a novel quantum interface scheme based on QND interactions that achieves perfect state transfer regardless of noise or interaction strength, with both deterministic and probabilistic versions.

Findings

Achieves perfect, deterministic state transfer with minimal interaction strength.

Proposes a probabilistic version eliminating the need for feed-forward correction.

Applicable to quantum memory and quantum sensing applications.

Abstract

We propose a quantum interface protocol based on two quantum-non-demolition interactions (QND) arranged either in sequence or in parallel. Since the QND coupling arises naturally in interactions between light and a macroscopic ensemble of atoms, or between light and a micro-mechanical oscillator, the proposed interface is capable of transferring a state of light onto these matter systems. The transfer itself is perfect and deterministic for any quantum state, for arbitrarily small interaction strengths, and for arbitrarily large noise of the target system. It requires an all-optical pre-processing, requiring a coupling stronger than that between the light and the matter, and a displacement feed-forward correction of the matter system. We also suggest a probabilistic version of the interface, which eliminates the need for the feed-forward correction at a cost of reduced success rate. An application of the interface can be found in construction of a quantum memory, or in the state preparation for quantum sensing.