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Direct measurement of nonlocal entanglement of two-qubit spin quantum states

机译:直接测量两个量子位自旋量子态的非局部纠缠

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摘要

We propose efficient schemes of direct concurrence measurement for two-qubit spin and photon-polarization entangled states via the interaction between single-photon pulses and nitrogen-vacancy (NV) centers in diamond embedded in optical microcavities. For different entangled-state types, diversified quantum devices and operations are designed accordingly. The initial unknown entangled states are possessed by two spatially separated participants, and nonlocal spin (polarization) entanglement can be measured with the aid of detection probabilities of photon (NV center) states. This non-demolition entanglement measurement manner makes initial entangled particle-pair avoid complete annihilation but evolve into corresponding maximally entangled states. Moreover, joint inter-qubit operation or global qubit readout is not required for the presented schemes and the final analyses inform favorable performance under the current parameters conditions in laboratory. The unique advantages of spin qubits assure our schemes wide potential applications in spin-based solid quantum information and computation.
机译:通过单光子脉冲与嵌入光学微腔中金刚石中的氮空位(NV)中心之间的相互作用,我们提出了用于两个量子位自旋和光子偏振纠缠态的直接并发测量的有效方案。对于不同的纠缠态类型,相应地设计了多种量子器件和操作。初始的未知纠缠态由两个在空间上分开的参与者拥有,并且可以借助光子(NV中心)态的检测概率来测量非局部自旋(极化)纠缠。这种非拆卸纠缠的测量方式使初始纠缠的粒子对避免了完全的evolve灭,而是演变为相应的最大纠缠态。此外,提出的方案不需要联合量子位间操作或全局量子位读出,并且最终分析告知在实验室当前参数条件下的良好性能。自旋量子位的独特优势确保了我们的方案在基于自旋的固体量子信息和计算中的广泛应用潜力。

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