منابع مشابه
Multi-Colour Quantum Metrology with Entangled Photons
Bryn Bell, Srikanth Kannan, Alex McMillan, Alex S. Clark, William J. Wadsworth, and John G. Rarity1,∗ Centre for Quantum Photonics, Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, UK Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science, University of Sydney, NSW 2006, Australia and Centre for ...
متن کاملAdvances in Quantum Metrology
In classical estimation theory, the central limit theorem implies that the statistical error in a measurement outcome can be reduced by an amount proportional to n by repeating the measures n times and then averaging. Using quantum effects, such as entanglement, it is often possible to do better, decreasing the error by an amount proportional to n. Quantum metrology is the study of those quantu...
متن کاملExponentially enhanced quantum metrology.
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.
متن کاملQuantum metrology: dynamics versus entanglement.
A parameter whose coupling to a quantum probe of n constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as 1/n3/2, even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n3/2 scaling without generating any entanglement among the constituents, and we suggest that the protocol might be impl...
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ژورنال
عنوان ژورنال: Advances in Physics: X
سال: 2016
ISSN: 2374-6149
DOI: 10.1080/23746149.2016.1230476