Inter-well beam splitting of independent BECs in an array of double wells yields a quantum Fisher information of about M n^2 / 2, exceeding the standard quantum limit without prior spin squeezing.
Holevo,Probabilistic and Statistical Aspects of Quan- tum Theory (Publications of Scuola Normale Superiore, 2011)
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Metrology using atoms in an array of double-well potentials
Inter-well beam splitting of independent BECs in an array of double wells yields a quantum Fisher information of about M n^2 / 2, exceeding the standard quantum limit without prior spin squeezing.