Cancellation of Internal Quantum Noise of an Amplifier by Quantum Correlation
Cancellation of Internal Quantum Noise of an Amplifier by Quantum Correlation
复制标题
通过量子相关消除放大器的内部量子噪声
DOI：
10.1103/physrevlett.111.033608
复制
发表时间：
2013-07-18
影响因子：
8.6
通讯作者：
Zhang, Weiping
中科院分区：
文献类型：
--
作者：
Kong, Jia;Hudelist, F.;Zhang, Weiping
量子噪声通常是在放大过程中通过放大器的内部度添加的。将压缩态耦合到内部度可以抑制额外的噪声。这里，我们演示了另一种方法：当放大器的内部度通过量子纠缠与输入信号相关时，输入与内部度之间的量子破坏性干涉可能导致放大输出的噪声降低。在放大过程中，量子噪声增益为4.5dB，输出量子噪声降低了2.3dB，信噪比提高了4.0+/-0.2dB。
Quantum noise is usually added in an amplification process through the internal degrees of the amplifier. Coupling the squeezed state to the internal degree can suppress the extra noise. Here, we demonstrate another method: when the internal degree of the amplifier is correlated with the input signal via quantum entanglement, quantum destructive interference between the input and the internal degree may result in noise reduction at the amplified output. We achieve a quantum noise reduction of 2.3 dB at the output and an improvement of 4.0 +/- 0.2 dB in signal-to-noise ratio during the amplification process with a quantum noise gain of 4.5 dB.