Quantum memories at finite temperature
Benjamin J. Brown, Daniel Loss, Jiannis K. Pachos, Chris N. Self, James R. Wootton · Reviews of Modern Physics · 2016
While the typical scenario for quantum error correction involves active intervention there are advantages to a passive quantum memory, for which a suitably designed interaction Hamiltonian will naturally protect the coherence of low-lying states from decoherence induced by a thermal environment. This review summarizes and discusses the various theoretical attempts to find a workable scenario for a passive quantum memory.