非等耦合远自旋与旋光介质的纠缠
Entanglement of Remote Spins with Unequal Coupling to an Optically Active Mediator
摘要：
我们证明了即使介质和量子比特之间的耦合强度不同，两个远程量子比特也可以通过光学活性中介体纠缠。这对于广泛的交互类是正确的。我们考虑两种截然不同的情况。首先，我们扩展了以前研究的门操作依赖于脉冲，动态控制的光学状态，可以快速执行的分析。我们表明，远程自旋可以纠缠在这种情况下，即使当中介耦合强度是不相等的。其次，我们提出了一种替代绝热控制程序，并发现在这种情况下，系统的要求变得更少的限制。该方案可以立即在一系列系统中进行测试，包括分子，量子点或晶体中的缺陷。
英文摘要：
We demonstrate that two remote qubits can be entangled through an optically active intermediary even if the coupling strengths between mediator and qubits are different. This is true for a broad class of interactions. We consider two contrasting scenarios. First, we extend the analysis of a previously studied gate operation which relies on pulsed, dynamical control of the optical state and which may be performed quickly. We show that remote spins can be entangled in this case even when the intermediary coupling strengths are unequal. Second, we propose an alternative adiabatic control procedure, and find that the system requirements become even less restrictive in this case. The scheme could be tested immediately in a range of systems including molecules, quantum dots, or defects in crystals.
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