Environment-assisted metrology with spin qubits

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

doi:10.1103/physreva.85.032336

Cited by 27 publications

(33 citation statements)

References 38 publications

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“…Then, we precisely characterize the hyperfine parameters of each nuclear spin by measuring the nuclear Larmor frequencieswith different electron spin states. We apply an adaptive method [36,37] based on the quantum phase estimation algorithm in a sequence of Ramsey-interferometry experiments to improve the efficiency of the frequency measurement. To validate the estimated Hamiltonian parameters, we numerically optimize quantum gates based on the learnt Hamiltonian parameters and experimentally demonstrate a universal set of quantum gates for this 11-qubit system of one electron spin and ten nuclear spins with high gate fidelities.…”

Section: Introductionmentioning

confidence: 99%

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*

Hou¹,

He²,

Wang³

et al. 2019

Chinese Phys. Lett.

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Learning Hamiltonian of a quantum system is indispensable for prediction of the system dynamics and realization of high fidelity quantum gates. However, it is a significant challenge to efficiently characterize the Hamiltonian when its Hilbert space dimension grows exponentially with the system size. Here, we experimentally demonstrate an adaptive method to learn the effective Hamiltonian of an 11-qubit quantum system consisting of one electron spin and ten nuclear spins associated with a single Nitrogen-Vacancy center in a diamond. We validate the estimated Hamiltonian by designing universal quantum gates based on the learnt Hamiltonian parameters and demonstrate high-fidelity gates in experiment. Our experimental demonstration shows a well-characterized 11-qubit quantum spin register with the ability to test quantum algorithms and to act as a multi-qubit single node in a quantum network.

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Section: Introductionmentioning

confidence: 99%

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*

Hou¹,

He²,

Wang³

et al. 2019

Chinese Phys. Lett.

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“…Chains of polarized dark spins could be used to enable coherent state transfer between distant NVs [13,14,27]. Environmentally enhanced magnetometry, where the dark spins are used for field sensing, could increase the sensitivity of NV-based magnetometers [15,28]. The resonant-coupling mechanism described here could also be extended to detect and polarize spins external to the diamond and thus enable single-molecule magnetic-resonance spectroscopy [16,29] and diamondbased quantum simulations [30].…”

mentioning

confidence: 99%

Dressed-State Resonant Coupling between Bright and Dark Spins in Diamond

et al. 2013

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Under ambient conditions, spin impurities in solid-state systems are found in thermally mixed states and are optically ''dark''; i.e., the spin states cannot be optically controlled. Nitrogen-vacancy (NV) centers in diamond are an exception in that the electronic spin states are ''bright''; i.e., they can be polarized by optical pumping, coherently manipulated with spin-resonance techniques, and read out optically, all at room temperature. Here we demonstrate a scheme to resonantly couple bright NV electronic spins to dark substitutional-nitrogen (P1) electronic spins by dressing their spin states with oscillating magnetic fields. This resonant coupling mechanism can be used to transfer spin polarization from NV spins to nearby dark spins and could be used to cool a mesoscopic bath of dark spins to near-zero temperature, thus providing a resource for quantum information and sensing, and aiding studies of quantum effects in many-body spin systems.

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“…[104][105][106][107][108][109] In parallel, studies on how to use quantum phenomena in metrology and sensing emerged, aiming to reach sensitivities beyond the limit imposed by classical physics. [110,111] While discussions continue on the ultimate limit of quantum sensing, [112][113][114][115][116] the use of single-electron spins Figure 4. SEM image of the single phosphorus spin qubit device developed at UNSW.…”

Section: Diamond Quantum Sensingmentioning

confidence: 99%

Isotope engineering of silicon and diamond for quantum computing and sensing applications

2014

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Some of the stable isotopes of silicon and carbon have zero nuclear spin, whereas many of the other elements that constitute semiconductors consist entirely of stable isotopes that have nuclear spins. Silicon and diamond crystals composed of nuclear-spin-free stable isotopes ( 28 Si, 30 Si, or 12 C) are considered to be ideal host matrixes to place spin quantum bits (qubits) for quantum-computing and -sensing applications, because their coherent properties are not disrupted thanks to the absence of host nuclear spins. The present paper describes the state-of-theart and future perspective of silicon and diamond isotope engineering for development of quantum information-processing devices.

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Environment-assisted metrology with spin qubits

Cited by 27 publications

References 38 publications

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*

Dressed-State Resonant Coupling between Bright and Dark Spins in Diamond

Isotope engineering of silicon and diamond for quantum computing and sensing applications

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Environment-assisted metrology with spin qubits

Cited by 27 publications

References 38 publications

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register*

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register*

Dressed-State Resonant Coupling between Bright and Dark Spins in Diamond

Isotope engineering of silicon and diamond for quantum computing and sensing applications

Contact Info

Product

Resources

About

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*

Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register^*