Practical Implications of Quantum Noise

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Abstract
This paper gives an introduction to quantum noise and the limits it places on optical measurements. Squeezed states of light, and their representation on phasor diagrams, are then introduced. The use of squeezed states to improve interferometric measurements is described. Quantum non-demolition measurements are discussed, with particular reference to their use in high sensitivity absorption experiments. Finally, sources of some other types of non-classical light and possible experiments making use of these sources are considered.

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