Environment-assisted metrology with spin qubits

TY - JOUR

T1 - Environment-assisted metrology with spin qubits

AU - Cappellaro, P.

AU - Goldstein, G.

AU - Hodges, J,s,

AU - Jiang, L.

AU - Maze, J.R.

AU - Sørensen, Anders Søndberg

AU - Lukin, M.D.

PY - 2012/3/30

Y1 - 2012/3/30

N2 - We investigate the sensitivity of a recently proposed method for precision measurement, focusing on an implementation based on solid-state spin systems. The scheme amplifies a quantum sensor response to weak external fields by exploiting its coupling to spin impurities in the environment. We analyze the limits to the sensitivity due to decoherence and propose dynamical decoupling schemes to increase the spin coherence time. The sensitivity is also limited by the environment spin polarization; therefore, we discuss strategies to polarize the environment spins and present a method to extend the scheme to the case of zero polarization. The coherence time and polarization determine a figure of merit for the environment's ability to enhance the sensitivity compared to echo-based sensing schemes. This figure of merit can be used to engineer optimized samples for high-sensitivity nanoscale magnetic sensing, such as diamond nanocrystals with controlled impurity density.

AB - We investigate the sensitivity of a recently proposed method for precision measurement, focusing on an implementation based on solid-state spin systems. The scheme amplifies a quantum sensor response to weak external fields by exploiting its coupling to spin impurities in the environment. We analyze the limits to the sensitivity due to decoherence and propose dynamical decoupling schemes to increase the spin coherence time. The sensitivity is also limited by the environment spin polarization; therefore, we discuss strategies to polarize the environment spins and present a method to extend the scheme to the case of zero polarization. The coherence time and polarization determine a figure of merit for the environment's ability to enhance the sensitivity compared to echo-based sensing schemes. This figure of merit can be used to engineer optimized samples for high-sensitivity nanoscale magnetic sensing, such as diamond nanocrystals with controlled impurity density.

U2 - 10.1103/PhysRevA.85.032336

DO - 10.1103/PhysRevA.85.032336

M3 - Journal article

SN - 2469-9926

VL - 85

SP - 032336

JO - Physical Review A (Atomic, Molecular and Optical Physics)

JF - Physical Review A (Atomic, Molecular and Optical Physics)

IS - 3

ER -