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arXiv 0812.1246quant-ph
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腔-QED网络中连续两量子比特宇称测量的物理模型

Physical model of continuous two-qubit parity measurement in a cavity-QED network

Joseph Kerckhoff, Luc Bouten, Andrew Silberfarb, Hideo Mabuchi

备注：
4 pages, 3 figures
发表信息：
Phys. Rev. A 79, 024305 (2009)
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摘要：

我们提出并分析了连续纠错所需的两个量子位奇偶校验测量的物理实现，假设一个设置，其中单个量子位强耦合到单独的光学腔。探测光从两个腔中依次散射，通过固定正交零差光探测实现连续宇称测量。我们提出的模型的基础上量子随机微分方程（QESTs）的一个理想的连续宇称测量和我们建议的腔量子电动力学（腔QED）的实施;最近的绝热消除定理QESTs的是用来断言强收敛的物理参数的适当限制，后者到前者。通过数值模拟研究了腔QED方案的性能。

英文摘要：

We propose and analyze a physical implementation of two-qubit parity measurements as required for continuous error correction, assuming a setup in which the individual qubits are strongly coupled to separate optical cavities. A single optical probe beam scatters sequentially from the two cavities and the continuous parity measurement is realized via fixed quadrature homodyne photo-detection. We present models based on quantum stochastic differential equations (QSDE's) for both an ideal continuous parity measurement and our proposed cavity quantum electrodynamics (cavity QED) implementation; a recent adiabatic elimination theorem for QSDE's is used to assert strong convergence of the latter to the former in an appropriate limit of physical parameters. Performance of the cavity QED scheme is studied via numerical simulation with experimentally realistic parameters.

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