期刊
PHYSICAL REVIEW LETTERS
卷 100, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.220501
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资金
- Engineering and Physical Sciences Research Council [EP/D500354/1] Funding Source: researchfish
We show that when a suitable entanglement-generating unitary operator depending on a parameter is applied on N qubits in parallel, a precision of the order of 2(-N) in estimating the parameter may be achieved. This exponentially improves the precision achievable in classical and in quantum nonentangling strategies.
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