避免引力波探测器外差读出3dB量子惩罚的双载波方案
A two-carrier scheme: evading the 3dB quantum penalty of heterodyne readout in gravitational-wave detectors
摘要：
与零差读出相比，使用传统外差读出的精密测量遭受3dB量子噪声惩罚。额外的噪声是由图像真空中的量子涨落引起的。我们提出了一种双载波引力波探测器的设计，避免了外差读出的3dB量子惩罚。我们进一步提出了一种利用双模压缩实现频率相关压缩的新方法。它自然地实现了更精确的音频信号测量与射频压缩。此外，该探测器还与其他量子非破坏技术兼容。
英文摘要：
Precision measurements using traditional heterodyne readout suffer a 3dB quantum noise penalty compared with homodyne readout. The extra noise is caused by the quantum fluctuations in the image vacuum. We propose a two-carrier gravitational-wave detector design that evades the 3dB quantum penalty of heterodyne readout. We further propose a new way of realising frequency-dependent squeezing utilising two-mode squeezing in our scheme. It naturally achieves more precise audio frequency signal measurements with radio frequency squeezing. In addition, the detector is compatible with other quantum nondemolition techniques.
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