Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.120501
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Funding
- French Agence Nationale de la Recherche [ANR-09-JCJC-0070]
- Army Research Office (ARO) [ARO-W911NF-09-1-0514]
- NSF [DMR-1004406]
- National Science Foundation [PHY-0969725]
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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.
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