State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.
Department of Physics, Zhejiang University, Hangzhou 310027, China.
Phys Rev Lett. 2019 Sep 13;123(11):113602. doi: 10.1103/PhysRevLett.123.113602.
We experimentally demonstrate a method for realizing quantum squeezing enhancement which is induced by the interference in a two-beam phase-sensitive amplifier (PSA) based on a four-wave mixing process. Compared to the normal phase-insensitive amplifier with an intensity-difference squeezing (IDS) of 8.97±0.24 dB or 8.76±0.26 dB, the IDS of our two-beam PSA is enhanced to 10.13±0.21 dB under the same experimental situation. Furthermore, we study how various parameters influence the quantum squeezing enhancement of the PSA. These results clearly show that the physical mechanism inducing the IDS enhancement of the two-beam PSA is its intrinsic interference nature. Our results may find potential applications in improving the fidelity of quantum information processing and the precision of quantum metrology.
我们实验演示了一种通过双光束相敏放大器（PSA）中的干涉实现量子压缩增强的方法，该 PSA 基于四波混频过程。与具有强度差压缩（IDS）为 8.97±0.24 dB 或 8.76±0.26 dB 的普通相敏放大器相比，在相同的实验条件下，我们的双光束 PSA 的 IDS 增强到 10.13±0.21 dB。此外，我们研究了各种参数如何影响 PSA 的量子压缩增强。这些结果清楚地表明，导致双光束 PSA 的 IDS 增强的物理机制是其内在的干涉性质。我们的结果可能在提高量子信息处理的保真度和量子计量的精度方面有潜在的应用。
