Multi-mode N00N states achieve Heisenberg scaling for distributed quantum sensing of a global phase average, demonstrated in a four-mode 2002 state experiment with 2.74 dB gain over the standard quantum limit.
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Distributed quantum sensing with multi-mode $N00N$ states
Multi-mode N00N states achieve Heisenberg scaling for distributed quantum sensing of a global phase average, demonstrated in a four-mode 2002 state experiment with 2.74 dB gain over the standard quantum limit.