Universal Quantum Transducers Based on Surface Acoustic Waves

Schuetz, Martin J. A.; Kessler, Eric; Giedke, G.; Vandersypen, L. M. K.; Lukin, Mikhail D.; Cirac, J. I.

doi:10.1103/physrevx.5.031031

Cited by 218 publications

(196 citation statements)

References 93 publications

(249 reference statements)

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“…Work is in progress to explore spin responses to uniaxial strains, which may be useful in applications ranging from nano-scale sensing 71 to creation of hybrid quantum systems [30][31][32] . 73 .…”

Section: Discussionmentioning

confidence: 99%

Designing defect-based qubit candidates in wide-gap binary semiconductors for solid-state quantum technologies

Seo

Govoni

et al. 2017

Phys. Rev. Materials

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The development of novel quantum bits is key to extend the scope of solid-state quantum information science and technology. Using first-principles calculations, we propose that large metal ionvacancy complexes are promising qubit candidates in two binary crystals: 4H-SiC and w-AlN. In particular, we found that the formation of neutral Hf-and Zr-vacancy complexes is energetically favorable in both solids; these defects have spin-triplet ground states, with electronic structures similar to those of the diamond NV center and the SiC di-vacancy. Interestingly, they exhibit different spin-strain coupling characteristics, and the nature of heavy metal ions may allow for easy defect implantation in desired lattice locations and ensure stability against defect diffusion. In order to support future experimental identification of the proposed defects, we report predictions of their optical zero-phonon line, zero-field splitting and hyperfine parameters. The defect design concept identified here may be generalized to other binary semiconductors to facilitate the exploration of new solid-state qubits.

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Section: Discussionmentioning

confidence: 99%

Designing defect-based qubit candidates in wide-gap binary semiconductors for solid-state quantum technologies

Seo

Govoni

et al. 2017

Phys. Rev. Materials

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“…The extensive technologies developed for micro-electromechanical systems (MEMS) can also be adapted for quantum acoustics. Potential applications in quantum information processing, such as phononic cavity QED, mechanically mediated spin entanglement, spin squeezing, and SAW-based universal quantum transducers interfacing a broad array of qubits, have been proposed recently [2][3][4][5][6]. Applications for phonon cooling and lasing have also been considered theoretically [7,8].…”

Section: Introductionmentioning

confidence: 99%

Coupling a Surface Acoustic Wave to an Electron Spin in Diamond via a Dark State

et al. 2016

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The emerging field of quantum acoustics explores interactions between acoustic waves and artificial atoms and their applications in quantum information processing. In this experimental study, we demonstrate the coupling between a surface acoustic wave (SAW) and an electron spin in diamond by taking advantage of the strong strain coupling of the excited states of a nitrogen vacancy center while avoiding the short lifetime of these states. The SAW-spin coupling takes place through a Λ-type three-level system where two ground spin states couple to a common excited state through a phonon-assisted as well as a direct dipole optical transition. Both coherent population trapping and optically driven spin transitions have been realized. The coherent population trapping demonstrates the coupling between a SAW and an electron spin coherence through a dark state. The optically driven spin transitions, which resemble the sideband transitions in a trapped-ion system, can enable the quantum control of both spin and mechanical degrees of freedom and potentially a trapped-ion-like solid-state system for applications in quantum computing. These results establish an experimental platform for spin-based quantum acoustics, bridging the gap between spintronics and quantum acoustics.

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“…we may be able to use mechanical systems as powerful resources for quantum information and metrology, such as universal transducers or quantum memories that are more compact than their electromagnetic counterparts 8,9,17,18 . In addition, since any coupling of qubits to other degrees of freedom can lead to decoherence, it is crucial to understand and control the interaction qubits might have to their mechanical environments 19 .…”

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confidence: 99%

Quantum acoustics with superconducting qubits

Chu

Kharel

Renninger

et al. 2017

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The ability to engineer and manipulate different varieties of quantum mechanical objects allows us to take advantage of their unique properties and create useful hybrid technologies 1 .Thus far, complex quantum states and exquisite quantum control have been demonstrated in systems ranging from trapped ions 2, 3 and solid state qubits 4,5 to superconducting microwave resonators 6,7 . Recently, there have been many efforts 8,9 to extend these demonstrations to the motion of complex, macroscopic objects. These mechanical objects have important practical applications in the fields of quantum information and metrology as quantum memories or transducers for measuring and connecting different types of quantum systems. In pursuit of such macroscopic quantum phenomena, mechanical oscillators have been interfaced with quantum devices such as optical cavities and superconducting circuits [10][11][12] . In particular, there have been a few experiments that couple motion to nonlinear quantum objects [13][14][15] such as superconducting qubits. Importantly, this opens up the possibility of creating, storing, and manipulating non-Gaussian quantum states in mechanical degrees of freedom. However, before sophisticated quantum control of mechanical motion can be achieved, we must overcome the challenge of realizing systems with long coherence times while maintaining a 1 arXiv:1703.00342v1 [quant-ph] 1 Mar 2017 sufficient interaction strength. These systems should be implemented in a simple and robust manner that allows for increasing complexity and scalability in the future. Here we experimentally demonstrate a high frequency bulk acoustic wave resonator that is strongly coupled to a superconducting qubit using piezoelectric transduction. In contrast to previous experiments with qubit-mechanical systems [13][14][15] , our device requires only simple fabrication methods, extends coherence times to many microseconds, and provides controllable access to a multitude of phonon modes. We use this system to demonstrate basic quantum operations on the coupled qubit-phonon system. Straightforward improvements to the current device will allow for advanced protocols analogous to what has been shown in optical and microwave resonators, resulting in a novel resource for implementing hybrid quantum technologies.Measuring and controlling the motion of massive objects in the quantum regime is of great interest for both technological applications and for furthering our understanding of quantum mechanics in complex systems. In some respects, the physics of phonons inside a crystal is similar to that of photons inside an electromagnetic resonator, which are routinely treated as quantum mechanical objects. However, such mechanical excitations involve the collective motion of a large number of atoms in the complex environment of a macroscopic object. Nevertheless, there has only been one demonstration of a nonlinear electromechanical system in the strong coupling limit 13 . The outstanding question is how to simultaneously achieve coherences 3 and c...

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Universal Quantum Transducers Based on Surface Acoustic Waves

Cited by 218 publications

References 93 publications

Designing defect-based qubit candidates in wide-gap binary semiconductors for solid-state quantum technologies

Designing defect-based qubit candidates in wide-gap binary semiconductors for solid-state quantum technologies

Coupling a Surface Acoustic Wave to an Electron Spin in Diamond via a Dark State

Quantum acoustics with superconducting qubits

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