8 October 2014 Z2 quantum memory implemented on circuit quantum electrodynamics
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We present a technique to store and retrieve single- and two-qubit states into a parity-protected quantum memory implemented on a state-of-the-art superconducting circuit architecture. Our proposal relies upon a specific superconducting circuit design that permits a tunable qubit-resonator coupling strength. The latter allows us to adiabatically tune from the weak coupling to the ultrastrong coupling regime of light-matter interaction, where a controllable and well-protected effective two-level system is defined due to the Z2 parity symmetry. Storage and retrieval time of the qubit are in a few nanoseconds timescale, which is far below the effective qubit coherence time.
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T. H. Kyaw, T. H. Kyaw, S. Felicetti, S. Felicetti, G. Romero, G. Romero, E. Solano, E. Solano, L. C. Kwek, L. C. Kwek, "Z2 quantum memory implemented on circuit quantum electrodynamics", Proc. SPIE 9225, Quantum Communications and Quantum Imaging XII, 92250B (8 October 2014); doi: 10.1117/12.2062893; https://doi.org/10.1117/12.2062893

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