We propose to encode a quantum bit of information in a superposition of coherent states of an oscillator, with four different phases. Our encoding in a single cavity mode, together with a protection protocol, significantly reduces the error rate due to photon loss. This protection is ensured by an efficient quantum error correction scheme employing the nonlinearity provided by a single physical qubit coupled to the cavity. We describe in detail how to implement these operations in a circuit quantum electrodynamics system. This proposal directly addresses the task of building a hardware-efficient quantum memory and can lead to important shortcuts in quantum computing architectures. © 2013 American Physical Society.
CITATION STYLE
Leghtas, Z., Kirchmair, G., Vlastakis, B., Schoelkopf, R. J., Devoret, M. H., & Mirrahimi, M. (2013). Hardware-efficient autonomous quantum memory protection. Physical Review Letters, 111(12). https://doi.org/10.1103/PhysRevLett.111.120501
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