Usually, " quantum limit " is a general term which refers to " any " restriction on measurement due to quantum effects, while the " standard quantum limit " in any given context refers to a quantum limit which is ubiquitous in that context.
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Usually, " quantum limit " is a general term which refers to " any " restriction on measurement due to quantum effects, while the " standard quantum limit " in any given context refers to a quantum limit which is ubiquitous in that context.