论文标题
单光子极化量子位的有效量子存储器
Efficient quantum memory for single photon polarization qubits
论文作者
论文摘要
用于存储和检索飞行光子量子状态的量子存储器是实现长距离量子通信和大规模量子计算的关键接口。尽管已经使用弱相干脉冲执行了许多高储存回程效率的实验方案，但到目前为止，实现的真实单光子的所有量子记忆的效率远低于50％，这是实际应用的阈值。在这里，我们报告了单光子极化量子位的量子记忆的证明，其效率> 85％，忠诚度> 99％，基于平衡的两道通道电磁诱导的激光冷却苏比特原子的透明度。对于单通道量子存储器，用于存储和检索单光子时间波形的优化效率可以高达90.6％。我们的结果将光子量子记忆推向量子信息处理中的实际应用。
A quantum memory, for storing and retrieving flying photonic quantum states, is a key interface for realizing long-distance quantum communication and large-scale quantum computation. While many experimental schemes of high storage-retrieval efficiency have been performed with weak coherent light pulses, all quantum memories for true single photons achieved so far have efficiencies far below 50%, a threshold value for practical applications. Here, we report the demonstration of a quantum memory for single-photon polarization qubits with an efficiency of >85% and a fidelity of >99 %, basing on balanced two-channel electromagnetically induced transparency in laser-cooled rubidium atoms. For the single-channel quantum memory, the optimized efficiency for storing and retrieving single-photon temporal waveforms can be as high as 90.6 %. Our result pushes the photonic quantum memory closer to its practical applications in quantum information processing.
