Matsukevich D N, Chanelière T, Jenkins S D, Lan S-Y, Kennedy T A B, Kuzmich A
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
Phys Rev Lett. 2006 Jan 27;96(3):030405. doi: 10.1103/PhysRevLett.96.030405. Epub 2006 Jan 25.
We report observations of entanglement of two remote atomic qubits, achieved by generating an entangled state of an atomic qubit and a single photon at site , transmitting the photon to site in an adjacent laboratory through an optical fiber, and converting the photon into an atomic qubit. Entanglement of the two remote atomic qubits is inferred by performing, locally, quantum state transfer of each of the atomic qubits onto a photonic qubit and subsequent measurement of polarization correlations in violation of the Bell inequality [EQUATION: SEE TEXT]. We experimentally determine [EQUATION: SEE TEXT]. Entanglement of two remote atomic qubits, each qubit consisting of two independent spin wave excitations, and reversible, coherent transfer of entanglement between matter and light represent important advances in quantum information science.
我们报告了对两个远程原子量子比特纠缠的观测结果，其实现方式是在一个地点生成一个原子量子比特与一个单光子的纠缠态，通过光纤将该光子传输到相邻实验室的另一个地点，并将该光子转换为一个原子量子比特。通过在本地对每个原子量子比特进行量子态转移到一个光子量子比特上，并随后测量违反贝尔不等式的偏振相关性，从而推断出这两个远程原子量子比特的纠缠[公式：见原文]。我们通过实验确定了[公式：见原文]。两个远程原子量子比特的纠缠，每个量子比特由两个独立的自旋波激发组成，以及物质与光之间纠缠的可逆、相干转移，代表了量子信息科学的重要进展。
