Entanglement between distant macroscopic mechanical and spin systems

Thomas, Rodrigo A.; Parniak, Michał; Østfeldt, Christoffer; Møller, C.; Bærentsen, Christian; Tsaturyan, Yeghishe; Schließer, Albert; Appel, J.; Zeuthen, Emil; Polzik, E. S.

doi:10.1038/s41567-020-1031-5

Cited by 106 publications

(83 citation statements)

References 42 publications

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“…There have been recent efforts to realize a PnC with dynamically tunable frequency [21][22][23][24][25][26][27][28][29][30][31][32] . Frequency tunability may unlock new regimes of guiding, filtering, and focusing phonons.…”

Section: Introductionmentioning

confidence: 99%

“…Frequency tunability may unlock new regimes of guiding, filtering, and focusing phonons. It would furthermore allow to resonantly couple to an external optical or mechanical excitation and thus realize sensing applications with mechanical qubits and studies on quantum entanglement 22 . Yet, the mechanical resonances in PnCs are determined by material constants and the crystal geometry [23][24][25][26][27] , which cannot be varied easily.…”

Section: Introductionmentioning

confidence: 99%

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Tunable graphene phononic crystal

Kirchhof

Weinel

Heeg

et al. 2020

Preprint

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In the field of phononics, periodic patterning controls vibrations and thereby the flow of heat and sound in matter. Bandgaps arising in such phononic crystals realize low-dissipation vibrational modes and enable applications towards mechanical qubits, efficient waveguides, and state-of-the-art sensing. Here, we combine phononics and two-dimensional materials and explore the possibility of manipulating phononic crystals via applied mechanical pressure. To this end, we fabricate the thinnest possible phononic crystal from monolayer graphene and simulate its vibrational properties. We find a bandgap in the MHz regime, within which we localize a defect mode with a small effective mass of 0.72 ag = 0.002 mphysical. Finally, we take advantage of graphene’s flexibility and mechanically tune a finite size phononic crystal. Under electrostatic pressure up to 30 kPa, we observe an upshift in frequency of the entire phononic system by more than 350%. At the same time, the defect mode stays within the bandgap and remains localized, suggesting a high-quality, dynamically tunable mechanical system.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable graphene phononic crystal

Kirchhof

Weinel

Heeg

et al. 2020

Preprint

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“…Recent years have seen significant interest in the study of theoretical and experimental aspects of optomechanical systems [1]. In particular, the reported achievements of ground-state cooling [2][3][4] as well as the entanglement of macroscopic systems [5][6][7][8] have significantly improved the prospects for using optomechanical systems as sensors [9][10][11] and for tests of fundamental physics [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Master-equation treatment of nonlinear optomechanical systems with optical loss

et al. 2021

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Open-system dynamics play a key role in the experimental and theoretical study of cavity optomechanical systems. In many cases, the quantum Langevin equations have enabled excellent models for optical decoherence, yet a master-equation approach to the fully nonlinear optomechanical Hamiltonian has thus far proven more elusive. To address this outstanding question and broaden the mathematical tool set available, we derive a solution to the Lindblad master equation that models optical decoherence for a system evolving with the nonlinear optomechanical Hamiltonian. The method combines a Lie-algebra solution to the unitary dynamics with a vectorization of the Lindblad equation, and we demonstrate its applicability by considering the preparation of optical cat states via the optomechanical nonlinearity in the presence of optical loss. Our results provide a direct way of analytically assessing the impact of optical decoherence on the optomechanical intracavity state.

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“…Cavity optomechanics [1] has become an established platform for the implementation of quantum information processing in which one can manipulate electromagnetic (e.m.) fields and mechanical/phononic degrees of freedom for the realization of quantum interfaces [2][3][4], memories [5], and quantum gates [6][7][8][9]. The optomechanical interaction is typically of parametric form; that is, the cavity frequency is modulated by the motion of the mechanical element, and therefore, it acts dispersively on the e.m. field.…”

Section: Introductionmentioning

confidence: 99%

Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime

Aporvari

Vitali

2021

Entropy

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Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation–pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamics corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer–Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime.

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Entanglement between distant macroscopic mechanical and spin systems

Cited by 106 publications

References 42 publications

Tunable graphene phononic crystal

Tunable graphene phononic crystal

Master-equation treatment of nonlinear optomechanical systems with optical loss

Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime

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