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* Speaker: Choi, Soonwon (UC Berkeley, USA)
* Speaker: Lee, Donghun (Korea Univ., Korea)




Strongly interacting solid-state spin ensembles provide a promising platform to explore quantum many-body physics. In particular, Nitrogen-Vacancy (NV) centers in diamond are appealing as they exhibit excellent spin properties even at room temperature. In this talk, I will present how a high-density NV ensemble can be used to investigate out-of-equilibrium quantum many-body phenomena. In particular, I will discuss the recent experimental observation of discrete time-crystalline (DTC) order: a nonequilibrium order characterized by a spontaneous breaking of time-translational symmetry and manifested in robust, long-lived subharmonic responses of a periodically driven system [1]. By engineering different types of effective interactions, we find that the spin ensemble can exhibit a long-lived robust subharmonic response over a wide range of parameters. Additional systematic investigation of the lifetime of the DTC response reveals three different regimes of relaxation dynamics, that can be continuously varied from disorder-induced slow thermalization, to driving assisted relaxation, and ultimately to universal Markovian dynamics [2]. These results highlight the utility of high-density NV ensembles as a probe of many-body dynamics and thermalization, an important aspect in the quest for the understanding and control of quantum matter, and may enable novel applications in quantum simulation and metrology with strongly correlated quantum matter [3].
There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices create exciting opportunities to mediate interactions between disparate qubits and to explore the quantum regime of macroscopic mechanical objects. In particular, a system consisting of the nitrogen-vacancy defect center in diamond embedded inside a high quality factor diamond mechanical oscillator is an appealing candidate for such a hybrid quantum device, as it combines the highly coherent and versatile spin properties of the defect center with the excellent mechanical properties of diamond resonators. In this talk, we will present recent experimental progress on diamond-based hybrid quantum devices in which the defect’s spin and orbital dynamics are mechanically driven by the motion of a mechanical oscillator. We will discuss the potential usage of multiple mechanical modes to fully engineer the strain environment of the defect center. For instance, simultaneous motion of flexural and torsional modes in T-shaped diamond cantilever can provide selective controls of linear and shear strain terms. We will also discuss future prospective applications, including strain-assisted indistinguishable photon generation, long range, phonon-mediated spin-spin interactions and phonon cooling and lasing in the quantum regime.


[1] S. Choi et al, Nature 543, 221–225 (2017)
[2] J. Choi et al, Phys. Rev. Lett. 122, 043603 (2019)
[3] S. Choi et al, arXiv:1801.00042 (2018)


[[Category:Qubits2019]]
[[Category:Qubits2019]]

Revision as of 05:38, 1 March 2019

  • Speaker: Lee, Donghun (Korea Univ., Korea)


There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices create exciting opportunities to mediate interactions between disparate qubits and to explore the quantum regime of macroscopic mechanical objects. In particular, a system consisting of the nitrogen-vacancy defect center in diamond embedded inside a high quality factor diamond mechanical oscillator is an appealing candidate for such a hybrid quantum device, as it combines the highly coherent and versatile spin properties of the defect center with the excellent mechanical properties of diamond resonators. In this talk, we will present recent experimental progress on diamond-based hybrid quantum devices in which the defect’s spin and orbital dynamics are mechanically driven by the motion of a mechanical oscillator. We will discuss the potential usage of multiple mechanical modes to fully engineer the strain environment of the defect center. For instance, simultaneous motion of flexural and torsional modes in T-shaped diamond cantilever can provide selective controls of linear and shear strain terms. We will also discuss future prospective applications, including strain-assisted indistinguishable photon generation, long range, phonon-mediated spin-spin interactions and phonon cooling and lasing in the quantum regime.