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arXiv · 2205.09767

Candidate for a passively protected quantum memory in two dimensions

Simon Lieu·Yu-Jie Liu·Alexey V. Gorshkov
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Abstract

An interesting problem in the field of quantum error correction involves finding a physical system that hosts a ``passively protected quantum memory,'' defined as an encoded qubit coupled to an environment that naturally wants to correct errors. To date, a quantum memory stable against finite-temperature effects is only known in four spatial dimensions or higher. Here, we take a different approach to realize a stable quantum memory by relying on a driven-dissipative environment. We propose a new model, the photonic-Ising model, which appears to passively correct against both bit-flip and phase-flip errors in two dimensions: A square lattice composed of photonic ``cat qubits'' coupled via dissipative terms which tend to fix errors locally. Inspired by the presence of two distinct $\mathbb{Z}_2$-symmetry-broken phases, our scheme relies on Ising-like dissipators to protect against bit flips and on a driven-dissipative photonic environment to protect against phase flips. We also discuss possible ways to realize the photonic-Ising model.

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Simon Lieu, Yu-Jie Liu, Alexey V. Gorshkov. 2022-05-19. Candidate for a passively protected quantum memory in two dimensions. https://arxiv.org/abs/2205.09767

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