Brange F, Malkoc O, Samuelsson P
Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden.
Phys Rev Lett. 2015 May 1;114(17):176803. doi: 10.1103/PhysRevLett.114.176803. Epub 2015 Apr 28.
Recent experiments have demonstrated subdecoherence time control of individual single-electron orbital qubits. Here we propose a quantum-dot-based scheme for generation and detection of pairs of orbitally entangled electrons on a time scale much shorter than the decoherence time. The electrons are entangled, via two-particle interference, and transferred to the detectors during a single cotunneling event, making the scheme insensitive to charge noise. For sufficiently long detector dot lifetimes, cross-correlation detection of the dot charges can be performed with real-time counting techniques, providing for an unambiguous short-time Bell inequality test of orbital entanglement.
近期的实验已经证明了对单个单电子轨道量子比特的亚退相干时间控制。在此，我们提出一种基于量子点的方案，用于在比退相干时间短得多的时间尺度上产生和检测轨道纠缠电子对。这些电子通过双粒子干涉实现纠缠，并在单个共隧穿事件期间转移到探测器，使得该方案对电荷噪声不敏感。对于足够长的探测器点寿命，可以使用实时计数技术对量子点电荷进行交叉关联检测，从而为轨道纠缠提供明确的短时间贝尔不等式测试。
