Wei Hai-Rui, Deng Fu-Guo
Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Opt Express. 2013 Jul 29;21(15):17671-85. doi: 10.1364/OE.21.017671.
We investigate the possibility of achieving scalable photonic quantum computing by the giant optical circular birefringence induced by a quantum-dot spin in a double-sided optical microcavity as a result of cavity quantum electrodynamics. We construct a deterministic controlled-not gate on two photonic qubits by two single-photon input-output processes and the readout on an electron-medium spin confined in an optical resonant microcavity. This idea could be applied to multi-qubit gates on photonic qubits and we give the quantum circuit for a three-photon Toffoli gate. High fidelities and high efficiencies could be achieved when the side leakage to the cavity loss rate is low. It is worth pointing out that our devices work in both the strong and the weak coupling regimes.
我们研究了通过量子点自旋在双面光学微腔中由于腔量子电动力学所诱导的巨大光学圆双折射来实现可扩展光子量子计算的可能性。我们通过两个单光子输入 - 输出过程以及对限制在光学共振微腔中的电子 - 介质自旋进行读出，在两个光子量子比特上构建了一个确定性受控非门。这个想法可以应用于光子量子比特上的多量子比特门，并且我们给出了一个三光子托佛利门的量子电路。当侧向泄漏到腔损耗率较低时，可以实现高保真度和高效率。值得指出的是，我们的器件在强耦合和弱耦合两种 regime 下都能工作。
