INRIA Paris-Rocquencourt, Domaine de Voluceau, Boîte Postale 105, 78153 Le Chesnay Cedex, France and Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2013 Sep 20;111(12):120501. doi: 10.1103/PhysRevLett.111.120501.
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.
我们建议在振荡器的相干态叠加中对量子位信息进行编码，其中有四个不同的相位。我们在单个腔模式中的编码，以及保护协议，显著降低了由于光子损失引起的错误率。这种保护是通过利用与腔耦合的单个物理量子位提供的非线性来实现的高效量子错误校正方案来确保的。我们详细描述了如何在电路量子电动力学系统中实现这些操作。该方案直接针对构建硬件高效量子存储器的任务，并可能导致量子计算体系结构中的重要捷径。
