Environment-Assisted Precision Measurement

Goldstein, Garry; Cappellaro, Paola; Maze, J. R.; Hodges, J. S.; Jiang, Liang; Sørensen, Anders S.; Lukin, Mikhail D.

doi:10.1103/physrevlett.106.140502

Cited by 96 publications

(111 citation statements)

References 26 publications

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“…U nderstanding and controlling the coherence of multispin-qubit solid-state systems is crucial for quantum information science [1][2][3] , basic research on quantum many-body dynamics 4 and quantum sensing and metrology [5][6][7][8][9] . Examples of such systems include nitrogen-vacancy (NV) colour centres in diamond 10 , phosphorous donors in silicon 11 and quantum dots 12 .…”

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confidence: 99%

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

et al. 2012

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multi-qubit systems are crucial for the advancement and application of quantum science. such systems require maintaining long coherence times while increasing the number of qubits available for coherent manipulation. For solid-state spin systems, qubit coherence is closely related to fundamental questions of many-body spin dynamics. Here we apply a coherent spectroscopic technique to characterize the dynamics of the composite solid-state spin environment of nitrogen-vacancy colour centres in room temperature diamond. We identify a possible new mechanism in diamond for suppression of electronic spin-bath dynamics in the presence of a nuclear spin bath of sufficient concentration. This suppression enhances the efficacy of dynamical decoupling techniques, resulting in increased coherence times for multispin-qubit systems, thus paving the way for applications in quantum information, sensing and metrology.

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Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

et al. 2012

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“…Here we present only the result for many ancillas in the limit of small field b, following the derivation of Ref. [2]. We neglect for the moment the coupling of the sensor spin to the magnetic field and only keep first-order terms in the field.…”

Section: The Environment-assisted Metrology Schemementioning

confidence: 99%

“…Here we provide more details of the method presented in Ref. [2] and consider several extensions of the work. To this end we assume that the spin environment can be collectively controlled and partially polarized.…”

Section: The Environment-assisted Metrology Schemementioning

confidence: 99%

“…If the environment interacts as well with the external field to be measured-as is the case for a spin bath-a different strategy is possible: In Ref. [2] we showed that in this case the spin environment can be used as a resource by mapping the phase acquired by the environment spins onto the probe spin before readout. Here we provide more details of the method presented in Ref.…”

Section: The Environment-assisted Metrology Schemementioning

confidence: 99%

“…We recently introduced a scheme [2] that aims at overcoming these two challenges. We proposed to use the environment of the sensor as an additional resource for metrology and we showed how to achieve the desired interaction Hamiltonian using coherent control techniques.…”

Section: Introductionmentioning

confidence: 99%

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Environment-assisted metrology with spin qubits

et al. 2012

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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.

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Cooperation between Coherent Control and Noises in Quantum Metrology

2023

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In this article, the cooperation between coherent control and noises in open spin systems is studied, aiming to demonstrate that such cooperation can provide new possibilities for parametrization in quantum metrology. The cooperative scheme proposed here outperforms the standard scheme, with higher precision achieved. More specifically, the effect of cooperative interaction between coherent control and noises in conventional single‐spin systems described by Lindblad master equations is illustrated, with the magnitude of a magnetic field taken as the parameter to be estimated and encoded in the noisy dynamics besides the Hamiltonian. The scenarios of both spontaneous emission and dephasing noise have been analyzed, where the associated quantum Fisher information has been given. Furthermore, it has been demonstrated that in the realm where quantum metrology is mostly applied in practice, the precision limit under the cooperative scheme in the presence of noises can surpass the ultimate precision limit under the unitary dynamics. On the other hand, multiple‐spin systems have also been considered. It is shown that the coupling between different spins can help realize non‐local parametrization under the cooperative scheme, with the ground state made entangled. This thus leads to the improvement of precision limit, which has been proved and visualized in this article.

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Environment-Assisted Precision Measurement

Cited by 96 publications

References 26 publications

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

Environment-assisted metrology with spin qubits

Cooperation between Coherent Control and Noises in Quantum Metrology

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