Abstract
It is the goal of quantum communication theory to establish fundamental limits on the performance and sensitivity of optical communication and signal processing systems as imposed by quantum effects, often in conjunction with other unavoidable interference. The theory is widely applicable and not limited to optical systems although they provide the original and still the main impetus. Thus many aspects of quantum communication theory are broadly relevant to precision measurements including those of experimental general relativity, the subject of this Advanced Study Institute. In the following I will review the two main themes of quantum communication studies, namely the utilization of novel quantum measurements and quantum states, pursuing their relations to precision measurements and quantum nondemolition measurements (QND). The role of two-photon coherent states (TCS) will be emphasized. A limitation on QND will be indicated.
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