Faurby Carlos F D, Carosini Lorenzo, Cao Huan, Sund Patrik I, Hansen Lena M, Giorgino Francesco, Villadsen Andrew B, van den Hoven Stefan N, Lodahl Peter, Paesani Stefano, Loredo Juan C, Walther Philip
Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, <a href="https://ror.org/035b05819">University of Copenhagen</a>, Blegdamsvej 17, Copenhagen 2100, Denmark.
<a href="https://ror.org/03prydq77">University of Vienna</a>, Faculty of Physics, Vienna Center for Quantum Science and Technology (VCQ), 1090 Vienna, Austria.
Phys Rev Lett. 2024 Jul 19;133(3):033604. doi: 10.1103/PhysRevLett.133.033604.
Indistinguishability between photons is a key requirement for scalable photonic quantum technologies. We experimentally demonstrate that partly distinguishable single photons can be purified to reach near-unity indistinguishability by the process of quantum interference with ancillary photons followed by heralded detection of a subset of them. We report on the indistinguishability of the purified photons by interfering two purified photons and show improvements in the photon indistinguishability of 2.774(3)% in the low-noise regime, and as high as 10.2(5)% in the high-noise regime.
光子之间的不可区分性是可扩展光子量子技术的关键要求。我们通过实验证明，部分可区分的单光子可以通过与辅助光子的量子干涉过程，然后对其中一部分进行宣告式检测，从而被纯化以达到接近完全的不可区分性。我们通过干涉两个纯化后的光子来报告纯化光子的不可区分性，并表明在低噪声 regime 中光子不可区分性提高了 2.774(3)%，在高噪声 regime 中高达 10.2(5)%。
