A quantum spectrum analyzer enhanced by a nuclear spin memory

Rosskopf, T.; Zopes, Jonathan; Boss, J. M.; Degen, Christian L.

doi:10.1038/s41534-017-0030-6

Cited by 59 publications

(49 citation statements)

References 56 publications

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“…For example, if dynamical decoupling is used to extend the probe coherence time to its fundamental limit T 2 ≤ 2T 1 , strong correlations between the probes can give a further enhancement. Other T 1 -limited schemes, such as correlation spectroscopy [2,41,42], can also be improved by introducing interactions between the probes.…”

Section: Discussionmentioning

confidence: 99%

Robust quantum sensing with strongly interacting probe systems

Dooley¹,

Hanks²,

Nakayama³

et al. 2018

npj Quantum Inf

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In the field of quantum metrology and sensing, a collection of quantum systems (e.g. spins) are used as a probe to estimate some physical parameter (e.g. magnetic field). It is usually assumed that there are no interactions between the probe systems. We show that strong interactions between them can increase robustness against thermal noise, leading to enhanced sensitivity. In principle, the sensitivity can scale exponentially in the number of probes -even at non-zero temperaturesif there are long-range interactions. This scheme can also be combined with other techniques, such as dynamical decoupling, to give enhanced sensitivity in realistic experiments. arXiv:1709.09387v2 [quant-ph]

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Section: Discussionmentioning

confidence: 99%

Robust quantum sensing with strongly interacting probe systems

Dooley¹,

Hanks²,

Nakayama³

et al. 2018

npj Quantum Inf

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show abstract

“…Initial experiments have demonstrated the detection and control of several nuclear spins surrounding individual defect or donor electron spins [12][13][14][15][16][17]. These nuclear spins provide robust qubits that enable enhanced quantum sensing protocols [7][8][9][10][11], quantum error correction [2,3,18], and multi-qubit nodes for optically connected quantum networks [19][20][21][22].…”

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confidence: 99%

One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment

et al. 2018

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Single electron spins coupled to multiple nuclear spins provide promising multi-qubit registers for quantum sensing and quantum networks. The obtainable level of control is determined by how well the electron spin can be selectively coupled to, and decoupled from, the surrounding nuclear spins. Here we realize a coherence time exceeding a second for a single nitrogen-vacancy electron spin through decoupling sequences tailored to its microscopic nuclear-spin environment. First, we use the electron spin to probe the environment, which is accurately described by seven individual and six pairs of coupled carbon-13 spins. We develop initialization, control and readout of the carbon-13 pairs in order to directly reveal their atomic structure. We then exploit this knowledge to store quantum states in the electron spin for over a second by carefully avoiding unwanted interactions. These results provide a proof-of-principle for quantum sensing of complex multi-spin systems and an opportunity for multi-qubit quantum registers with long coherence times.

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“…One such quantum sensor is the Nitrogen Vacancy (NV) center in diamond, which is one of the most promising platforms for quantum sensing and many other applications of quantum mechanics [1,2]. Increasing the coherence of NV centers via better controlled growth of diamonds [3], implementation of dynamical decoupling sequences [4][5][6], and quantum memories [7] are few of the many advances that have led to an improved magnetic field sensitivity, able to probe nanoscale weak phenomena in condensed matter [8][9][10] and biology [11]. Measuring weak signals is however not just a matter of using a sensitive device, but also being able to extract signals out of environmental noise via long averaging.…”

Section: Introductionmentioning

confidence: 99%

Cross-Sensor Feedback Stabilization of an Emulated Quantum Spin Gyroscope

et al. 2019

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Quantum sensors, such as the Nitrogen Vacancy (NV) color center in diamond, are known for their exquisite sensitivity, but their performance over time are subject to degradation by environmental noise. To improve the long-term robustness of a quantum sensor, here we realize an integrated combinatorial spin sensor in the same micrometer-scale footprint, which exploits two different spin sensitivities to distinct physical quantities to stabilize one spin sensor with local information collected in realtime via the second sensor. We show that we can use the electronic spins of a large ensemble of NV centers as sensors of the local magnetic field fluctuations, affecting both spin sensors, in order to stabilize the output signal of interleaved Ramsey sequences performed on the 14 N nuclear spin. An envisioned application of such a device is to sense rotation rates with a stability of several days, allowing navigation with limited or no requirement of geo-localization. Our results would enable stable rotation sensing for over several hours, which already reflects better performance than MEMS gyroscopes of comparable sensitivity and size. arXiv:1808.04494v2 [quant-ph]

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A quantum spectrum analyzer enhanced by a nuclear spin memory

Cited by 59 publications

References 56 publications

Robust quantum sensing with strongly interacting probe systems

Robust quantum sensing with strongly interacting probe systems

One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment

Cross-Sensor Feedback Stabilization of an Emulated Quantum Spin Gyroscope

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