Entanglement Assisted Metrology

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dc.creatorCappellaro, Paola
dc.creatorEmerson, Joseph
dc.creatorBoulant, Nicolas
dc.creatorRamanathan, Chandrasekhar
dc.creatorLloyd, Seth
dc.creatorCory, David G.
dc.date2004-11-18
dc.date.accessioned2026-07-07T06:11:33Z
dc.date.available2026-07-07T06:11:33Z
dc.descriptionWe 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.
dc.description4 pages, submitted to PRL
dc.identifierhttps://arxiv.org/abs/quant-ph/0411128
dc.identifierhttp://arxiv.org/abs/quant-ph/0411128
dc.identifierPhys. Rev. Lett. 94, 020502 (2005)
dc.identifierdoi:10.1103/PhysRevLett.94.020502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/92517
dc.subjectQuantum Physics
dc.titleEntanglement Assisted Metrology
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