Entanglement Assisted Metrology

Details Entanglement Assisted Metrology Entanglement Assisted Metrology

2004-11-18

arxiv.org/abs/quant-ph/0411128v1

Phys. Rev. Lett. 94, 020502 (2005)

Physics

Quantum Physics

4 pages, submitted to PRL

Scientific paper

10.1103/PhysRevLett.94.020502

We propose a new approach to the measurement of a single spin state, based on nuclear magnetic resonance (NMR) techniques and inspired by the coherent control over many-body systems envisaged by Quantum Information Processing (QIP). A single target spin is coupled via the natural magnetic dipolar interaction to a large ensemble of spins. Applying external radio frequency (rf) pulses, we can control the evolution of the system so that the spin ensemble reaches one of two orthogonal states whose collective properties differ depending on the state of the target spin and are easily measured. We first describe this measurement process using QIP gates; then we show how equivalent schemes can be defined in terms of the Hamiltonian of the spin system and thus implemented under conditions of real control, using well established NMR techniques. We demonstrate this method with a proof of principle experiment in ensemble liquid state NMR and simulations for small spin systems.

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