Quantum correlation in disordered spin systems: entanglement and
  applications to magnetic sensing

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Abstract

We propose a strategy to generate a many-body entangled state in a collection of randomly placed, dipolarly coupled electronic spins in the solid state. By using coherent control to restrict the evolution into a suitable collective subspace, this method enables the preparation of GHZ-like and spin-squeezed states even for randomly positioned spins, while in addition protecting the entangled states against decoherence. We consider the application of this squeezing method to improve the sensitivity of nanoscale magnetometer based on Nitrogen-Vacancy spin qubits in diamond.

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Most cited references 16

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Squeezed spin states

Masahiro Kitagawa, Masahito Ueda (1993)

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Squeezed atomic states and projection noise in spectroscopy

D J Wineland, J. J. Bollinger, W M Itano … (1994)

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Is Open Access

High-sensitivity diamond magnetometer with nanoscale resolution

R. Walsworth, J M Taylor, A Yacoby … (2008)

We present a novel approach to the detection of weak magnetic fields that takes advantage of recently developed techniques for the coherent control of solid-state electron spin quantum bits. Specifically, we investigate a magnetic sensor based on Nitrogen-Vacancy centers in room-temperature diamond. We discuss two important applications of this technique: a nanoscale magnetometer that could potentially detect precession of single nuclear spins and an optical magnetic field imager combining spatial resolution ranging from micrometers to millimeters with a sensitivity approaching few femtotesla/Hz\(^{1/2}\).