Hardware-efficient autonomous quantum error correction

TL;DR

This paper introduces a hardware-efficient autonomous quantum error correction method using a cavity mode and a single qubit to protect logical qubits from energy relaxation, aiming to improve quantum memory robustness.

Contribution

It presents a novel scheme for autonomous error correction encoding in a cavity mode with practical implementation details, enhancing quantum memory hardware efficiency.

Findings

Proposes a new autonomous error correction scheme for cavity-based qubits.

Details practical implementation strategies for the encoding and correction operations.

Addresses hardware efficiency in quantum memory design.

Abstract

We propose a new method to autonomously correct for errors of a logical qubit induced by energy relaxation. This scheme encodes the logical qubit as a multi-component superposition of coherent states in a harmonic oscillator, more specifically a cavity mode. The sequences of encoding, decoding and correction operations employ the non-linearity provided by a single physical qubit coupled to the cavity. We layout in detail how to implement these operations in a practical system. This proposal directly addresses the task of building a hardware-efficient and technically realizable quantum memory.