Direct observation of deterministic macroscopic entanglement

Kotler, Shlomi; Peterson, Gabriel A.; Shojaee, Ezad; Lecocq, Florent; Cicak, Katarina; Kwiatkowski, Alex; Geller, Shawn; Glancy, Scott; Knill, Emanuel; Simmonds, Raymond W.; Aumentado, José; Teufel, John

doi:10.1126/science.abf2998

Cited by 191 publications

(97 citation statements)

References 42 publications

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“…However, such benefit will become evident at low temperatures (< 1 K), relevant for quantum experiments involving GHz mechanical modes, or in a different material systems, when/where the thermal conductivity of the substrate and slab becomes comparable [29,30]. As a consequence, upscaled slab-on-substrate optomechanical crystals, which come with larger quality factors, could be unique at low temperatures for exploration of modalities including phonon sensing and macroscopic mechanical oscillators in the quantum regime [31,32].…”

Section: Discussionmentioning

confidence: 99%

Optomechanical crystal with bound states in the continuum

Liu,

Tong,

Fang

2022

Preprint

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Chipscale micro-and nano-optomechanical systems, hinging on the intangible radiation-pressure force, have shown their unique strength in sensing, signal transduction, and exploration of quantum physics with mechanical resonators. Optomechanical crystals, as one of the leading device platforms, enable simultaneous molding of the band structure of optical photons and microwave phonons with strong optomechanical coupling. Here, we demonstrate a new breed of optomechanical crystals in two-dimensional slab-on-substrate structures empowered by mechanical bound states in the continuum (BICs) at 8 GHz. We show symmetry-induced BIC emergence with optomechanical couplings up to g/2π ≈ 2.5 MHz per unit cell, on par with low-dimensional optomechanical crystals. Our work paves the way towards exploration of photon-phonon interaction beyond suspended microcavities, which might lead to new applications of optomechanics from phonon sensing to quantum transduction.

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Section: Discussionmentioning

confidence: 99%

Optomechanical crystal with bound states in the continuum

Liu,

Tong,

Fang

2022

Preprint

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“…Moreover, the preparation of the cubic-phase state or the cluster state can be experimentally certified by means of quantum tomographic strategies, following for example the scheme recently implemented to verify two-mode entanglement in electromechanical systems [143]. In particular, methods for reconstructing the state of a network of harmonic resonators coupled to an auxiliary mode [144] or to a two-level system [145] have been proposed.…”

Section: Experimental Feasibilitymentioning

confidence: 99%

Unconditional measurement-based quantum computation with optomechanical continuous variables

et al. 2022

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Universal quantum computation encoded over continuous variables can be achieved via Gaussian measurements acting on entangled non-Gaussian states. However, due to the weakness of available nonlinearities, generally these states can only be prepared conditionally, potentially with low probability. Here we show how universal quantum computation could be implemented unconditionally using an integrated platform able to sustain both linear and quadratic optomechanical-like interactions. Specifically, considering cavity opto-and electromechanical systems, we propose a realization of a driven-dissipative dynamics that deterministically prepares the required non-Gaussian cluster states-entangled squeezed states of multiple mechanical oscillators suitably interspersed with cubic-phase states. We next demonstrate how arbitrary Gaussian measurements on the cluster nodes can be performed by continuously monitoring the output cavity field. Finally, the feasibility requirements of this approach are analyzed in detail, suggesting that its building blocks are within reach of current technology.

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“…Leveraging these techniques has enabled quality factors approaching one billion at room temperature in amorphous nanomechanical resonators [44,45,47], together with predictions that even higher quality factors should be possible using crystalline resonators [47,48]. This provides the prospect of orders-of-magnitude sensitivity enhancements in nanomechanical sensors [49], extremely narrow nanomechanical filters [50], high density nanomechanical memories [51] and delay lines that can passively store information for many minutes [52], as well as fundamentally new technologies such as nanomechanical computer [5] and quantum information processors [53,54]. The purpose of this review is to provide an introduction to these new techniques, and an outlook on applications and what further advances may be possible in future.…”

Section: Introductionmentioning

confidence: 99%

Nanomechanical Dissipation and Strain Engineering

Sementilli,

Romero,

Bowen

2021

Preprint

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Nanomechanical resonators have applications in a wide variety of technologies ranging from biochemical sensors to mobile communications, quantum computing, inertial sensing, and precision navigation. The quality factor of the mechanical resonance is critical for many applications. Until recently, mechanical quality factors rarely exceeded a million. In the past few years however, new methods have been developed to exceed this boundary. These methods involve careful engineering of the structure of the nanomechanical resonator, including the use of acoustic bandgaps and nested structures to suppress dissipation into the substrate, and the use of dissipation dilution and strain engineering to increase the mechanical frequency and suppress intrinsic dissipation. Together, they have allowed quality factors to reach values near a billion at room temperature, resulting in exceptionally low dissipation. This review aims to provide a pedagogical introduction to these new methods, primarily targeted to readers who are new to the field, together with an overview of the existing state-of-the-art, what may be possible in the future, and a perspective on the future applications of these extreme-high quality resonators.

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Direct observation of deterministic macroscopic entanglement

Cited by 191 publications

References 42 publications

Optomechanical crystal with bound states in the continuum

Optomechanical crystal with bound states in the continuum

Unconditional measurement-based quantum computation with optomechanical continuous variables

Nanomechanical Dissipation and Strain Engineering

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