Entanglement of microwave-optical modes in a strongly coupled electro-optomechanical system

Zhong, Changchun; Han, Xu; Tang, Hong X.; Jiang, Liang

doi:10.1103/physreva.101.032345

Cited by 36 publications

(15 citation statements)

References 68 publications

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“…In recent decades, progress on understanding and engineering this light-matter interaction has produced groundbreaking experiments in cavity optomechanics, including laser feedback cooling [3], parametric light-matter processes in kg-scale [4] and picogram-scale [5][6][7] optomechanical systems, and laser cooling of mechanical modes to their ground state [7,8]. These quantum optics-like experiments have paved the way for optomechanical devices to be used in quantum transduction [9][10][11][12][13] and entanglement [14,15].…”

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confidence: 99%

A spin-optomechanical quantum interface enabled by an ultrasmall mechanical and optical mode volume cavity

Raniwala¹,

Krastanov²,

Eichenfield³

et al. 2022

Preprint

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We propose a coherent mechanical interface between defect centers in diamond and telecom optical modes. Combining recent developments in spin-mechanical devices and optomechanical crystals, we introduce a 1D diamond nanobeam with embedded mechanical and electric field concentrator with mechanical and optical mode volumes V mech /Λ 3 p ∼ 10 −5 and Vopt/λ 3 ∼ 10 −3 , respectively. By placing a Group IV vacancy in the concentrator we demonstrate exquisitely high spin-mechanical coupling rates approaching 40 MHz, while retaining high acousto-optical couplings. We theoretically show that such a device, used in an entanglement heralding scheme, can provide high-fidelity Bell pairs between quantum repeaters. Using the mechanical interface as an intermediary between the optical and spin subsystems, we are able to directly use telecom optics, bypassing the native wavelength requirements of the spin. As the spin is never optically excited or addressed, we do not suffer from spectral diffusion and can operate at higher temperatures (up to 40 K), limited only by thermal losses. We estimate that based on these metrics, optomechanical devices with high spin-mechanical coupling will be a useful architecture for near-term quantum repeaters.

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confidence: 99%

A spin-optomechanical quantum interface enabled by an ultrasmall mechanical and optical mode volume cavity

Raniwala¹,

Krastanov²,

Eichenfield³

et al. 2022

Preprint

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“…The resulting quantum channel can always be characterized by effective loss and added noise parameters which directly determine the transduction fidelity [10]. An alternative protocol uses the OE entan-glement generation capability of the transducer itself as a resource to accomplish the mode conversion via quantum teleportation [11][12][13][14]. More involved protocols introduce squeezed ancilla states to the unused input ports and homodyne measurements of the unused output ports in order to improve transduction fidelity of imperfect transducers [15].…”

Section: Introductionmentioning

confidence: 99%

Entanglement Thresholds of Doubly-Parametric Quantum Transducers

Rau¹,

Kyle²,

Kwiatkowski³

et al. 2021

Preprint

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Doubly-parametric quantum transducers, such as electro-opto-mechanical devices, are quickly approaching quantum operation as decoherence mechanisms such as thermal noise, loss, and limited cooperativities are improved. These devices show potential as the critical link between quantum information contained at frequencies as disparate as those in the optical and microwave domains, thus enabling applications such as long distance networking of superconducting quantum computers. However, the requirements on the operating parameters of the transducers necessary to achieve quantum operation have yet to be characterized. In this work we find simple, explicit expressions for the necessary and sufficient conditions under which doubly-parametric transducers in the resolvedsideband, steady-state limit are capable of entangling optical and microwave modes. Our analysis treats the transducer as a two-mode bosonic Gaussian channel capable of both beamsplitter-type and two-mode squeezing-type interactions between optical and microwave modes. For the beamsplittertype interaction, we find parameter thresholds which distinguish regions of the channel's separability, capacity for bound entanglement, and capacity for distillable entanglement. By contrast, the twomode squeezing-type interaction always produces distillable entanglement with no restrictions on temperature, cooperativities, or losses. Finally, we find the entanglement breaking conditions on the reduced one-mode upconversion and downconversion channels obtained by initializing the unused input with vacuum while ignoring the unused output. These differences between the entanglement thresholds of the beamsplitter-type and two-mode squeezing-type interactions are then important considerations in the construction of larger quantum networks that integrate multiple transducers.

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“…A critical requirement in these approaches is to optimize conversion efficiency and to minimize added noise but achieving both simultaneously is extremely challenging. Recently proposed heralded transduction from a microwave to an optical photon by heralding on a microwave Bell pair may help [25,34], but two such transduction steps would still be necessary for end-to-end state transfer, entailing high overhead. Alternatively, microwave transduction to proximal diamond color center spins has been proposed for highspeed and high-fidelity quantum network teleportation, but efficient coupling between a single spin and microwave photon has not yet been shown.…”

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confidence: 99%

“…Several techniques can be used to reduce the effects of thermal noise in our proposed system, including light shielding [46] and immersion in a liquid helium coolant [16]. Additionally, the microwave-optical transducer can be physically connected to a 1-K stage, while radiatively overcoupling the microwave cavity mode to a thermal bath at 10 mK, as proposed in previous works [25,34,47]. This allows the transducer to use the greater cooling power of a 1-K stage while the noise is dominated by that of the colder stage.…”

mentioning

confidence: 99%