Dissipation-assisted preparation of steady spin-squeezed states of SiV centers

Chen, Jia-Qiang; Qiao, Yi-Fan; Dong, Xing-Liang; Hei, Xin-Lei; Li, Pengbo

doi:10.1103/physreva.103.013709

Cited by 15 publications

(5 citation statements)

References 80 publications

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“…As illustrated in figure 1, we consider two SiV center spins that are strain-coupled to a nanomechanical resonator. The Hamiltonian of the spin-mechanical hybrid system is given by [17,31,32,[43][44][45][46] the interaction between the spins and phonons with coupling strength g j being the spin-phonon coupling strength.…”

Section: Model and Methodsmentioning

confidence: 99%

“…These devices are promising since in terms of present nanofabrication techniques, it is capable of fabricating high-quality mechanical modes at GHz frequency [26][27][28][29][30], while SiV centers in diamond, owing to their long coherence time and the highly favourable spectral properties, have become one of the most promising solid-state quantum emitters [19][20][21][22]. So far, the strain coupling between solid spins and mechanical modes has been regarded as a new type of coupling interface to realize a phonon network in the strong coupling regime [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

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Protected two-qubit entangling gate with mechanical driven continuous dynamical decoupling

Sun

Liu

Chen

et al. 2022

Commun. Theor. Phys.

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In this work, we propose a high-fidelity phonon-mediated entangling gate in a hybrid mechanical system based on two silicon-vacancy color centers in diamond. In order to suppress the influence of the spin decoherence on the entangling gate, we use continuous dynamical decoupling approach to create new dressed spin states, which are less sensitive to environmental fluctuations and exhibit an extended $T_{2}^*$ spin dephasing time. The effective spin-spin Hamiltonian modified by the mechanical driving field and the corresponding master equation are derived in the dispersive regime. We show that in the presence of the mechanical driving field, the effective spin-spin coupling can be highly controlled. By calculating the entangling gate fidelity in the dressed basis, we find that once the mechanical field is turned on, the gate fidelity can be significantly improved. In particular, under an optimized spin-phonon detuning and a stronger Rabi frequency of the mechanical driving field, the two-qubit gate is capable of reaching fidelity exceeding $0.99$. Moreover, by employing appropriate driving modulation, we show that a high-fidelity full quantum gate can be also realized, in which the initial and final spin states are in bare basis. Our work provides a promising scheme for realizing high-fidelity quantum information processing.

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Section: Model and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Protected two-qubit entangling gate with mechanical driven continuous dynamical decoupling

Sun

Liu

Chen

et al. 2022

Commun. Theor. Phys.

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show abstract

“…Spin squeezing means that the fluctuation of the quantum state is lower than the standard quantum limit [1][2][3][4][5][6]; it plays an important role in the field of quantum information and quantum metrology [7][8][9][10][11][12][13][14][15][16][17]. Currently, spin squeezing has been generated in many systems using the dynamic method [18][19][20][21][22][23][24][25] and reservoir engineering [26][27][28][29][30][31][32][33][34][35]. Although great progress has been achieved, there is still a considerable challenge to overcome.…”

Section: Introductionmentioning

confidence: 99%

Pure spin squeezing of h -BN spins coupled to superconducting resonator

et al. 2023

Self Cite

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The negatively charged boron vacancy (VB − ) spin defect in two-dimensional (2D) hexagonal boron nitride (h-BN) has attracted much attention for potential applications in quantum photonics recently. Its inherent van der Waals force mechanism guarantees convenient heterostructures for quantum sensing. By virtue of such materials, researchers not only can fabricate enough thin spin film naturally close to the sensing target but also can prepare an almost perfect spin ensemble with a uniform orientation. We here propose a setup with an ensemble of VB − spins strongly coupled to the superconducting coplanar waveguide resonator through the magnetic-dipolar interaction. The collective coupling strength is predicted to be G/2π ∼ 15 MHz, which corresponds to the strong coupling region. This collective spin-photon interaction can mimic the one-axis twisting Lipkin-Meshkov-Glick model effectively and therefore guarantee the dynamic generation of the spin-squeezed state. In addition, we show the influence of inhomogeneous coupling caused by sample thickness on squeezing, which proves the validity of the homogeneity assumption in our scheme. This attempt not only explores the possibility and superiority of 2D VB − spins but also opens another avenue for quantum hybridization.

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“…Several proposals for hybrid systems in cavity-QED [4], circuit-QED [5], and spin-mechanical hybrid systems have already been implemented in recent years. The spin-mechanical hybrid system combines quantum systems with long coherence time, such as trapped atoms or ions [30][31][32][33][34], solid-state spins [35][36][37][38][39][40][41], and mechanical oscillators with high-quality factors, such as cantilevers [16][17][18][19][20][21][22][23] and nanobeams [11][12][13][14]. It has been widely used in the preparation of a non-classical quantum state of mechanical motion [24,25], ground-state cooling [14][15][16], ultrasensitive sensing [10,42], as well as the generation of interaction between two distant quantum systems [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Enhanced spin-mechanical interaction with levitated micromagnets

Pan¹,

Hei²,

Dong³

et al. 2022

Preprint

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Spin-mechanical hybrid systems have been widely used in quantum information processing. However, the spin-mechanical interaction is generally weak, making it a critical challenge to enhance the spin-mechanical interaction into the strong coupling or even ultra-strong coupling regime. Here, we propose a protocol that can significantly enhance the spin-mechanical coupling strength with a diamond spin vacancy and a levitated micromagnet. A driving electrical current is used to modulate the mechanical motion of the levitated micromagnet, which induces a two-phonon drive and can exponentially enhance the spin-phonon and phonon-medicated spin-spin coupling strengths. Furthermore, a high fidelity Schrödinger cat state and an unconventional 2-qubit geometric phase gate with high fidelity and faster gate speed can be achieved using this hybrid system. This protocol provides a promising platform for quantum information processing with NV spins coupled to levitated micromagnets.

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Dissipation-assisted preparation of steady spin-squeezed states of SiV centers

Cited by 15 publications

References 80 publications

Protected two-qubit entangling gate with mechanical driven continuous dynamical decoupling

Protected two-qubit entangling gate with mechanical driven continuous dynamical decoupling

Pure spin squeezing of h -BN spins coupled to superconducting resonator

Enhanced spin-mechanical interaction with levitated micromagnets

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