Standard Quantum Limit
The standard quantum limit for the noise of some optical measurement scheme usually refers to the minimum level of quantum noise which can be obtained without the use of squeezed states of light. Some examples are:
- The standard quantum limit for high-frequency intensity noise of a laser is the shot noise limit, and a lower intensity noise level can be obtained only with amplitude-squeezed light.
- There is also a standard quantum limit for phase noise, which is reached by a laser only at high noise frequencies.
- The sensitivity of various optical measurements, e.g. of length measurements with interferometers , has a standard quantum limit.
- The same applies to certain correlations e.g. of intensity noise between two optical beams.
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