Ockeloen-Korppi C F, Damskägg E, Pirkkalainen J-M, Heikkilä T T, Massel F, Sillanpää M A
Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland.
Department of Physics and Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL) FI-40014 University of Jyväskylä, Finland.
Phys Rev Lett. 2017 Mar 10;118(10):103601. doi: 10.1103/PhysRevLett.118.103601. Epub 2017 Mar 6.
A process which strongly amplifies both quadrature amplitudes of an oscillatory signal necessarily adds noise. Alternatively, if the information in one quadrature is lost in phase-sensitive amplification, it is possible to completely reconstruct the other quadrature. Here we demonstrate such a nearly perfect phase-sensitive measurement using a cavity optomechanical scheme, characterized by an extremely small noise less than 0.2 quanta. The device also strongly squeezes microwave radiation by 8 dB below vacuum. A source of bright squeezed microwaves opens up applications in manipulations of quantum systems, and noiseless amplification can be used even at modest cryogenic temperatures.
一个强烈放大振荡信号两个正交振幅的过程必然会增加噪声。或者，如果一个正交分量中的信息在相敏放大中丢失，那么就有可能完全重构另一个正交分量。在这里，我们展示了一种使用腔光机械方案的近乎完美的相敏测量，其特征是具有小于0.2量子的极小噪声。该装置还能将微波辐射强烈压缩至比真空低8分贝。明亮压缩微波源为量子系统的操控开辟了应用前景，而且即使在适度的低温下也能使用无噪声放大。
