Integrated-optics heralded controlled-NOT gate for polarization-encoded qubits
Integrated-optics heralded controlled-NOT gate for polarization-encoded qubits
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DOI：
10.1038/s41534-018-0068-0
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发表时间：
2017-08
影响因子：
7.6
通讯作者：
Jonas Zeuner;Aditya N. Sharma;Max Tillmann;R. Heilmann;M. Gräfe;A. Moqanaki;A. Szameit;P. Walther
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文献类型：
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作者：
Jonas Zeuner;Aditya N. Sharma;Max Tillmann;R. Heilmann;M. Gräfe;A. Moqanaki;A. Szameit;P. Walther
集成光学技术的最新进展使光子学成为量子网络和量子计算协议的一个有前途的平台。集成光学电路的特点是器件占地面积小和无与伦比的固有干涉稳定性。在这里，我们利用飞秒激光写入波导的能力来处理偏振编码的量子比特，并提出了一种预告片上可控非门的实现。我们从计算基础和叠加基两个方面对门的性能进行了评估，结果表明门可以在两个光子之间产生偏振纠缠。通过集成器件的传输通过使用热膨胀的纤芯光纤和在波导面的绝热减小的模场直径来优化。这一演示强调了用于全光量子网络和量子中继器的集成量子门的可行性。
Recent progress in integrated-optics technology has made photonics a promising platform for quantum networks and quantum computation protocols. Integrated optical circuits are characterized by small device footprints and unrivalled intrinsic interferometric stability. Here, we take advantage of femtosecond-laser-written waveguides’ ability to process polarization-encoded qubits and present an implementation of a heralded controlled-NOT gate on chip. We evaluate the gate performance in the computational basis and a superposition basis, showing that the gate can create polarization entanglement between two photons. Transmission through the integrated device is optimized using thermally expanded core fibers and adiabatically reduced mode-field diameters at the waveguide facets. This demonstration underlines the feasibility of integrated quantum gates for all-optical quantum networks and quantum repeaters.