Loss Tolerant Linear Optical Quantum Memory By Measurement Based Quantum Computing

TL;DR

This paper proposes a measurement-based linear optical quantum memory scheme that is tolerant to qubit loss, enabling long-term quantum data storage with polynomial resource scaling.

Contribution

It introduces a loss-tolerant quantum memory design within the one-way quantum computing model using an efficient encoding method.

Findings

Loss-tolerant quantum memory is feasible with polynomial resource increase.

Long-term quantum data storage is possible with only logarithmic increase in photon lifetime.

The approach is compatible with existing measurement-based quantum computing frameworks.

Abstract

We give a scheme for loss tolerantly building a linear optical quantum memory which itself is tolerant to qubit loss. We use the encoding recently introduced in [Phys. Rev. Lett. 97, 120501, (2006)] and give a method for efficiently achieving this. The entire approach resides within the "One-way" model for quantum computing. Our results suggest that it is possible to build a loss tolerant quantum memory, such that if the requirement is to keep the data stored over arbitrarily long times then this is possible with only polynomially increasing resources and logarithmically increasing individual photon life times.