Collectively Enhanced Interactions in Solid-State Spin Qubits

Weimer, Hendrik; Yao, Norman Y.; Lukin, Mikhail D.

doi:10.1103/physrevlett.110.067601

Cited by 25 publications

(36 citation statements)

References 101 publications

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“…Furthermore, the achieved concentration of ∼ 10 15 NV/cm 3 corresponds to NV-NV dipolar coupling of ∼ 50 Hz. By repeating the irradiation process on isotopically pure 12 C samples, where ∼ 30 ms coherence times can be achieved using optimized dynamical decoupling [13], the NV-NV interaction dominated regime could be reached, opening an avenue for the study of many-body spin dynamics with available samples and processing techniques [10][11][12].…”

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confidence: 99%

“…The sensitivity of magnetic sensing grows as the square-root of the number of spins [1,3], thus enhanced NV concentrations could improve magnetometric sensitivities. Furthermore, enhanced NV concentrations could lead to strong NV-NV couplings, which together with long coherence times, achieved using a proper dynamical decoupling protocol [13], could pave the way toward the study of many-body dynamics in the NV-NV interaction-dominated regime [10][11][12]. However, nitrogen defects not associated with vacancies (P1 centers) create randomly fluctuating magnetic fields that cause decoherence of the quantum state of the NV ensemble [14,15].…”

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confidence: 99%

“…In addition to the fundamental understanding of spin dynamics, such research could pave the way toward the demonstration of non-classical spin states, which will be useful for a variety of applications in quantum information and quantum sensing. One of the leading candidates for such studies is the negatively charged nitrogen-vacancy (NV) center in diamond, having unique spin and optical properties, which make it useful for various sensing applications [1][2][3][4][5][6][7][8][9], as well as a resource for quantum information processing and quantum simulation [10][11][12].…”

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Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

Farfurnik

Alfasi

Masis

et al. 2017

Applied Physics Letters

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The studies of many-body dynamics of interacting spin ensembles, as well as quantum sensing in solid state systems, are often limited by the need for high spin concentrations, along with efficient decoupling of the spin ensemble from its environment. In particular, for an ensemble of nitrogenvacancy (NV) centers in diamond, high conversion efficiencies between nitrogen (P1) defects and NV centers are essential, while maintaining long coherence times of an NV ensemble. In this work, we study the effect of electron irradiation on the conversion efficiency and the coherence time of various types of diamond samples with different initial nitrogen concentrations. The samples were irradiated using a 200 keV transmission electron microscope (TEM). Our study reveals that the efficiency of NV creation strongly depends on the initial conversion efficiency as well as on the initial nitrogen concentration. The irradiation of the examined samples exhibits an order of magnitude improvement in the NV concentration (up to ∼ 10 11 NV/cm 2 ), without degradation in their coherence times of ∼ 180 µs. We address the potential of this technique toward the study of many-body physics of NV ensembles and the creation of non-classical spin states for quantum sensing. The study of quantum many-body spin physics in realistic solid-state platforms has been a long-standing goal in quantum and condensed-matter physics. In addition to the fundamental understanding of spin dynamics, such research could pave the way toward the demonstration of non-classical spin states, which will be useful for a variety of applications in quantum information and quantum sensing. One of the leading candidates for such studies is the negatively charged nitrogen-vacancy (NV) center in diamond, having unique spin and optical properties, which make it useful for various sensing applications [1][2][3][4][5][6][7][8][9], as well as a resource for quantum information processing and quantum simulation [10][11][12].The current state-of-the-art is limited by the requirement of obtaining high spin concentrations while maintaining long coherence times. The sensitivity of magnetic sensing grows as the square-root of the number of spins [1,3], thus enhanced NV concentrations could improve magnetometric sensitivities. Furthermore, enhanced NV concentrations could lead to strong NV-NV couplings, which together with long coherence times, achieved using a proper dynamical decoupling protocol [13], could pave the way toward the study of many-body dynamics in the NV-NV interaction-dominated regime [10][11][12]. However, nitrogen defects not associated with vacancies (P1 centers) create randomly fluctuating magnetic fields that cause decoherence of the quantum state of the NV ensemble [14,15]. As a result, in most cases it would be beneficial to increase the concentration of NV centers while keeping the nitrogen concentration constant, i.e. improve the N to NV conversion efficiency.A common technique for improving the conversion efficiency is the irradiation of the sample with elec...

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Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

Farfurnik

Alfasi

Masis

et al. 2017

Applied Physics Letters

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“…Spin states have previously been considered as a way of storing a qubit (i.e., two orthogonal collective spin states are used as computational basis states of an effective qubit [12,13,14,15]) but can be naturally utilised for CV quantum information processing by creating CV entangled states in a spin system. We assume that the initial state consists of each of the N A qubits in the same pure state, an easily prepared state in principle.…”

Section: Introductionmentioning

confidence: 99%

Generating non-classical states from spin coherent states via interaction with ancillary spins

Dooley

Joo

Proctor

et al. 2015

Optics Communications

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The generation of non-classical states of large quantum systems has attracted much interest from a foundational perspective, but also because of the significant potential of such states in emerging quantum technologies. In this paper we consider the possibility of generating non-classical states of a system of spins by interaction with an ancillary system, starting from an easily prepared initial state . We extend previous results for an ancillary system comprising a single spin to bigger ancillary systems and the interaction strength is enhanced by a factor of the number of ancillary spins. Depending on initial conditions, we find -by a combination of approximation and numerics -that the system of spins can evolve to spin cat states, spin squeezed states or to multiple cat states. * We also discuss some candidate systems for implementation of the Hamiltonian necessary to generate these non-classical states.

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“…[48]. The next step is to rewrite the Hamiltonian in terms of collective operators S † A,α in place of the microscopic atomic operators σ j α,g .…”

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Fractional quantum Hall states of Rydberg polaritons

et al. 2015

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We propose a scheme for realizing fractional quantum Hall states of light. In our scheme, photons of two polarizations are coupled to different atomic Rydberg states to form two flavors of Rydberg polaritons that behave as an effective spin. An array of optical cavity modes overlapping with the atomic cloud enables the realization of an effective spin-1/2 lattice. We show that the dipolar interaction between such polaritons, inherited from the Rydberg states, can be exploited to create a flat, topological band for a single spin-flip excitation. At half filling, this gives rise to a photonic (or polaritonic) fractional Chern insulator -a lattice-based, fractional quantum Hall state of light. [3]. On the other hand, the recent experimental realization of topological band structures in arrays of photonic modes [4,5] points to the intriguing possibility of realizing strongly-correlated interacting topological states of light [6,7]. Given that photonic systems are prepared and probed differently [8], typically have no chemical potential [9], and exhibit different decoherence mechanisms [10,11] as compared to their electronic counterparts, interacting topological states of light will open new avenues to the study of exotic physics [6]. Furthermore, such states might enable the construction of numerous robust, i.e. topologically protected, optical devices such as filters [6], switches, and delay lines [12,13]. Finally, once such highly non-classical states of light are released onto freely propagating non-interacting modes, they might be usable as resources for enhanced precision measurements and imaging [14].While strong interactions between microwave photons are readily achievable [15][16][17][18][19][20], the realization of strong high-fidelity interactions between optical photons has remained a challenge [21][22][23]. Only recently, the required strong interaction between optical photons has been implemented in a robust fashion by transforming photons into superpositions of light and highly excited atomic Rydberg states, thus forming polaritons. These polaritons inherit strong dipolar interactions from Rydberg states [24][25][26][27][28][29][30][31][32] and -together with artificial gauge fields that arise naturally in dipolar systems via the Einstein-deHaas effect [3,33,34] -constitute an ideal platform for realizing interacting topological states of light [35][36][37][38].In this Letter, we present the first example of a fractional Chern insulator of photons (or polaritons) in such a medium. The particular insulator we construct corresponds to the ν = 1/2 filling fraction of the familiar Laughlin fractional quantum Hall state, in which an ad- arXiv:1411.6624v1 [cond-mat.quant-gas]

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Collectively Enhanced Interactions in Solid-State Spin Qubits

Cited by 25 publications

References 101 publications

Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

Generating non-classical states from spin coherent states via interaction with ancillary spins

Fractional quantum Hall states of Rydberg polaritons

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