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.
@article{arxiv.1207.0679,
title = {Hardware-efficient autonomous quantum error correction},
author = {Zaki Leghtas and Gerhard Kirchmair and Brian Vlastakis and Robert Schoelkopf and Michel Devoret and Mazyar Mirrahimi},
journal= {arXiv preprint arXiv:1207.0679},
year = {2015}
}