Robust control of individual nuclear spins in diamond

Smeltzer, Benjamin K.; McIntyre, Jean; Childress, Lilian

doi:10.1103/physreva.80.050302

Cited by 144 publications

(189 citation statements)

References 31 publications

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“…Therefore, a nonmonotonic behavior can be changed by polarizing the spin bath in diamond. [46][47][48] Here we adopted this strategy 46-49 by making use of a level anti-crossing in the excited state of the NV center to polarize the nuclear spins in diamond. By applying magnetic field along the axis of NV center, the tripe-mode spin bath was converted to a single mode system, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

et al. 2018

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The memory effects in non-Markovian quantum dynamics can induce the revival of quantum coherence, which is believed to provide important physical resources for quantum information processing (QIP). However, no real quantum algorithms have been demonstrated with the help of such memory effects. Here, we experimentally implemented a non-Markovianity-assisted highfidelity refined Deutsch-Jozsa algorithm (RDJA) with a solid spin in diamond. The memory effects can induce pronounced nonmonotonic variations in the RDJA results, which were confirmed to follow a non-Markovian quantum process by measuring the non-Markovianity of the spin system. By applying the memory effects as physical resources with the assistance of dynamical decoupling, the probability of success of RDJA was elevated above 97% in the open quantum system. This study not only demonstrates that the non-Markovianity is an important physical resource but also presents a feasible way to employ this physical resource. It will stimulate the application of the memory effects in non-Markovian quantum dynamics to improve the performance of practical QIP.npj Quantum Information (2018) 4:3 ; doi:10.1038/s41534-017-0053-z INTRODUCTION Based on quantum phenomena, such as superposition, correlation and entanglement, quantum information processing (QIP) has provided great advantages over its classical counterpart 1-3 in efficient algorithms, 4,5 secure communication, 6,7 and highprecision metrology. [8][9][10][11][12][13][14][15][16] However, quantum superposition and correlation are fragile in an open quantum system. Notorious decoherence, [17][18][19] which is caused by interactions with noisy environments, is a major hurdle in the realization of fault-tolerant coherent operation 20,21 and scalable quantum computation. To further expand the implementation of QIP in open quantum systems, full understanding and control of environmental interactions are required. 17,[22][23][24] Many techniques have been developed to address this issue, including decoherence-free subspaces, 25 dynamical decoupling (DD) 13,26 and the geometric approach. 27 However, actively utilizing the environmental interactions would represent a significant achievement, compared with passively shielding them.Usually, the interaction of an open quantum system with a noisy environment exhibits memory-less dynamics with an irreversible loss of quantum coherence, that can be described by the Born-Markov approximation. 28 However, because of strong system-environment couplings, structured or finite reservoirs, low temperatures, or large initial system-environment correlations, the dynamics of an open quantum system may deviate substantially from the Born-Markov approximation and follow a non-Markovian process. [28][29][30][31][32] In such a process, the pronounced memory effect, which is the primary feature of a non-Markovian environment, can be used to revive the genuine quantum properties, 28-34 such as quantum coherence and correlations. Consequently, improving the performance of QIP by utilizing memo...

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Section: Resultsmentioning

confidence: 99%

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

et al. 2018

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“…The NV electron spin is coupled to the nuclear spin of the NV's own nitrogen atom (I 0 = 1 for 14 N isotope, I 0 = 1/2 for 15 N isotope) via hyperfine interaction A 0 S z 0 I z 0 , where A 0 = −2π · 2.16 MHz for 14 N and A 0 = 2π · 3.03 MHz for 14 N. 67,68 The nuclear spin relaxation is slow, so that for a single experimental run the nuclear spin state is constant, but changes randomly between different experimental runs.…”

Section: Nv Center Coupled To the Dilute Spin Bathmentioning

confidence: 99%

Decay of the rotary echoes for the spin of a nitrogen-vacancy center in diamond

Mkhitaryan

Dobrovitski

2014

Phys. Rev. B

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We study dynamics of the electron spin of a nitrogen-vacancy (NV) center subjected to a strong driving field with periodically reversed direction (train of rotary echoes). We use analytical and numerical tools to analyze in detail the form and timescales of decay of the rotary echo train, modeling the decohering spin environment as a random magnetic field. We demonstrate that the problem can be exactly mapped onto a model of spin 1 coupled to a single bosonic mode with imaginary frequency. This mapping allows comprehensive analytical investigation beyond the standard BlochRedfield-type approaches. We explore the decay of the rotary echo train under assumption of strong driving, and identify the most important regimes of the decay. The analytical results are compared with the direct numerical simulations to confirm quantitative accuracy of our study. We present the results for realistic environment of substitutional nitrogen atoms (P1 centers), and provide a simplified but accurate description for decay of the rotary echo train of the NV center's spin. The approach presented here can also be used to study decoherence and longitudinal relaxation of other spin systems under conditions of strong driving.

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“…Manipulation of such systems often utilizes a combination of microwave (MW) excitation to drive electronic spin transitions and radiofrequency (RF) excitation to control nuclear spins [2,3,7,8]. Experimental techniques typically rely on sequential RF and MW pulses [2,3], but a better understanding of simultaneous MW and RF excitation may enable greater parallelism in manipulating few-spin systems.…”

Section: Introductionmentioning

confidence: 99%

Multifrequency spin resonance in diamond

Childress

McIntyre

2010

Phys. Rev. A

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Magnetic resonance techniques provide a powerful tool for controlling spin systems, with applications ranging from quantum information processing to medical imaging. Nevertheless, the behavior of a spin system under strong excitation remains a rich dynamical problem. In this paper, we examine spin resonance of the nitrogen-vacancy center in diamond under conditions outside the regime where the usual rotating wave approximation applies, focusing on effects of multifrequency excitation and excitation with orientation parallel to the spin quantization axis. Strong-field phenomena such as multiphoton transitions and coherent destruction of tunneling are observed in the spectra and analyzed via numerical and analytic theory. In addition to illustrating the response of a spin system to strong multifrequency excitation, these observations may inform techniques for manipulating electron-nuclear spin quantum registers.

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Robust control of individual nuclear spins in diamond

Cited by 144 publications

References 31 publications

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

Decay of the rotary echoes for the spin of a nitrogen-vacancy center in diamond

Multifrequency spin resonance in diamond

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