Exponentially Enhanced Quantum Metrology

Details Exponentially Enhanced Quantum Metrology Exponentially Enhanced Quantum Metrology

2006-07-24

arxiv.org/abs/quant-ph/0607152v1

Physics

Quantum Physics

4 pages, 1 postscript figure ; typos corrected

Scientific paper

We show that when a suitable entanglement generating unitary operator depending on a parameter is applied on N qubits in parallel, and an appropriate observable is measured, a precision of order 2 raised to the power (-N) in estimating the parameter may be achieved. This exponentially improves the precision achievable in classical and in quantum non-entangling parallel strategies. We propose a quantum-optics model of laser light interacting with an N-qubit system, say a polyatomic molecule, via a generalized Jaynes-Cummings interaction which, in principle, could achieve the exponentially enhanced precision.

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