Environment Assisted Metrology with Spin Qubit

Abstract

We investigate the sensitivity of a recently proposed method for precision measurement [Phys. Rev. Lett. 106, 140502 (2011)], 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.

9 pages, 6 figures

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• High-sensitivity diamond magnetometer with nanoscale resolution
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• Entanglement-free Heisenberg-limited phase estimation
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• Electron spin decoherence of single Nitrogen-Vacancy defects in diamond
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Cited by in corpus (14)

• Quantum sensing
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• Composite-pulse magnetometry with a solid-state quantum sensor
• Generation of a coherent electronic spin cluster in diamond
• Hierarchy of measurement-induced Fisher information for composite states
• Two-electron-spin ratchets as a platform for microwave-free dynamic nuclear polarization of arbitrary material targets
• Enhanced Quantum Metrology with Non-Phase-Covariant Noise
• Low-control and robust quantum refrigerator and applications with electronic spins in diamond
• Limited-control metrology approaching the Heisenberg limit without entanglement preparation
• Quantum memory assisted precision rotation sensing
• Dynamic quantum-enhanced sensing without entanglement in central spin systems
• Quantum Critical Environment Assisted Quantum Magnetometer
• Cooperation between coherent control and noises in quantum metrology
• Isotope engineering of silicon and diamond for quantum computing and sensing applications