Abstract
Abstract : Recent work has highlighted the potential applications of two-photon coherent states (TCS), also known as squeezed states, in optical communications and precision measurements. This research program was aimed at generating TCS light via degenerate four-wave mixing (DFWM), and verifying the non-classical nature of TCS light via photon-counting measurements. The preceding experimental work was supported by analytical studies of DFWM TCS generation, and quantum photodetection. In addition, analyses were performed of key proposed TCS applications in optical communications and phase-sensing interferometry. Although the experimental effort did not yield any TCS observations, it did succeed in providing the firt quantum-noise limited measurements obtained from DFWM. Moreover, the associated theoretical effort clarified pump quantum noise, probe-conjugate loss, and backward vs forward DFWM issues in TCS generation. Furthermore, the applications research developed simultaneous amplitude and phase uncertainty relations for optical heterodyne detection, and showed explicitly how to use TCS to surpass the so-called standard quantum limit (SQL) on position sensing in a gravity-wave detecting interferometer.
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