Real-Time Charge Initialization of Diamond Nitrogen-Vacancy Centers for Enhanced Spin Readout

Hopper, David A.; Lauigan, Joseph D.; Huang, Tzu-Yung; Bassett, Lee C.

doi:10.1103/physrevapplied.13.024016

Cited by 40 publications

(20 citation statements)

References 49 publications

(63 reference statements)

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“…In contrast, will not be excited and stay at charge state NV − . Such a deterministic SCC differs from previous work using non-resonant excitation to enhance the readout efficiency of NV center 18 – 23 .…”

Section: Resultsmentioning

confidence: 89%

High-fidelity single-shot readout of single electron spin in diamond with spin-to-charge conversion

Zhang

Guo

et al. 2021

Nat Commun

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High fidelity single-shot readout of qubits is a crucial component for fault-tolerant quantum computing and scalable quantum networks. In recent years, the nitrogen-vacancy (NV) center in diamond has risen as a leading platform for the above applications. The current single-shot readout of the NV electron spin relies on resonance fluorescence method at cryogenic temperature. However, the spin-flip process interrupts the optical cycling transition, therefore, limits the readout fidelity. Here, we introduce a spin-to-charge conversion method assisted by near-infrared (NIR) light to suppress the spin-flip error. This method leverages high spin-selectivity of cryogenic resonance excitation and flexibility of photoionization. We achieve an overall fidelity > 95% for the single-shot readout of an NV center electron spin in the presence of high strain and fast spin-flip process. With further improvements, this technique has the potential to achieve spin readout fidelity exceeding the fault-tolerant threshold, and may also find applications on integrated optoelectronic devices.

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Section: Resultsmentioning

confidence: 89%

High-fidelity single-shot readout of single electron spin in diamond with spin-to-charge conversion

Zhang

Guo

et al. 2021

Nat Commun

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“…The scheme includes three elaborately devised techniques, i.e., real-time feedback for NV negative state preparation (Fig. 2B) (25), chopped laser sequence for a better spin polarization (26,27) without destroying charge state (Fig. 2C), and exquisite optimal control and population shelving for polarization transfer to nuclear spins (Fig.…”

Section: Deterministic and Joint Initialization Of Nv Negative State Nv Electron Spin And Two Nuclear Spinsmentioning

confidence: 99%

Beating the standard quantum limit under ambient conditions with solid-state spins

et al. 2021

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The use of entangled sensors improves the precision limit from the standard quantum limit (SQL) to the Heisenberg limit. Most previous experiments beating the SQL are performed on the sensors that are well isolated under extreme conditions. Here, we demonstrate a sub-SQL interferometer at ambient conditions by using a multispin system, namely, the nitrogen-vacancy (NV) defect in diamond. We achieve two-spin interference with a phase sensitivity of 1.79 ± 0.06 dB beyond the SQL and three-spin interference with a phase sensitivity of 2.77 ± 0.10 dB. Besides, a magnetic sensitivity of 0.87 ± 0.09 dB beyond the SQL is achieved by two-spin interference for detecting a real magnetic field. Particularly, the deterministic and joint initialization of NV negative state, NV electron spin, and two nuclear spins is realized at room temperature. The techniques used here are of fundamental importance for quantum sensing and computing, and naturally applicable to other solid-state spin systems.

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“…Once a defect's charge dynamics are understood and can be controlled, they present new opportunities for optical and electrical control, including electrical generation of single photons [61] and long-term information storage [62]. Charge states coupled to spin states can also be harnessed to significantly improve the efficiency of state initialization [63] and optical readout [64] for quantum computing or quantum sensing, or to enable photoelectric spin readout in microelectronic devices [65].…”

Section: B Optical Dynamics Of Quantum Defectsmentioning

confidence: 99%

Photon emission correlation spectroscopy as an analytical tool for quantum defects

Fishman¹,

Patel²,

Hopper³

et al. 2021

Preprint

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Photon emission correlation spectroscopy has a long history in the study of atoms, molecules, and, more recently, solid-state quantum defects. In solid-state systems, its most common use is as an indicator of single-photon emission, a key property for quantum technology. However, photon correlation data can provide a wealth of information about quantum emitters beyond their singlephoton purity -information that can reveal details about an emitter's electronic structure and optical dynamics that are hidden by other spectroscopy techniques. We present a standardized framework for using photon emission correlation spectroscopy to study quantum emitters, including discussion of theory, data acquisition, analysis, and interpretation. We highlight nuances and best practices regarding the commonly used g (2) (τ = 0) < 0.5 test for single-photon emission. Finally, we illustrate how this experimental technique can be paired with optical dynamics simulations to formulate an electronic model for unknown quantum emitters, enabling the design of quantum control protocols and assessment of their suitability for quantum information science applications.

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Real-Time Charge Initialization of Diamond Nitrogen-Vacancy Centers for Enhanced Spin Readout

Cited by 40 publications

References 49 publications

High-fidelity single-shot readout of single electron spin in diamond with spin-to-charge conversion

High-fidelity single-shot readout of single electron spin in diamond with spin-to-charge conversion

Beating the standard quantum limit under ambient conditions with solid-state spins

Photon emission correlation spectroscopy as an analytical tool for quantum defects

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