Perspectives on quantum transduction

Lauk, Nikolai; Sinclair, Neil; Barzanjeh, Shabir; Covey, Jacob P.; Saffman, M.; Spiropulu, M.; Simon, Christoph

doi:10.1088/2058-9565/ab788a

Cited by 220 publications

(149 citation statements)

References 111 publications

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“…So far, our discussion has been based on Förster defects and the spin-independent interaction coefficients C 3k and has not taken into consideration the angular factor S k (θ ) appearing in Eq. (5), which depends on the magnetic quantum numbers, the system geometry, and externally applied electric and magnetic fields. In the following, we extend our treatment to include the magnetic quantum numbers m j in the description and we account for Zeeman degeneracy.…”

Section: Pair Potentials External Fields and Angular Dependencementioning

confidence: 99%

Strong zero-field Förster resonances in K-Rb Rydberg systems

Otto

Kjærgaard

Deb

2020

Phys. Rev. Research

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We study resonant dipole-dipole coupling and the associated van der Waals energy shifts in Rydberg excited atomic rubidium and potassium and investigate Förster resonances between interspecies pair states. A comprehensive survey over experimentally accessible pair state combinations reveals multiple candidates with small Förster defects. We crucially identify the existence of an ultrastrong, "low" electric field K-Rb Förster resonance with an extremely large zero-field crossover distance exceeding 100 μm between the van der Waals regime and the resonant regime. This resonance allows for a strong interaction over a wide range of distances and by investigating its dependence on the strength and orientation of external fields we show this to be largely isotropic. As a result, the resonance offers a highly favorable setting for studying long-range resonant excitation transfer and entanglement generation between atomic ensembles in a flexible geometry. The two-species K-Rb system establishes a unique way of realizing a Rydberg single-photon optical transistor with a high input photon rate and we specifically investigate an experimental scheme with two separate ensembles.

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Section: Pair Potentials External Fields and Angular Dependencementioning

confidence: 99%

Strong zero-field Förster resonances in K-Rb Rydberg systems

Otto

Kjærgaard

Deb

2020

Phys. Rev. Research

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“…For this approach, a critical component are transducers that convert input microwave signals to the optical domain, which are compatible with low temperature operation and are sufficiently efficient to ensure low noise conversion of microwave to optical signals. Indeed, substantial efforts are underway to create quantum-coherent interfaces between the microwave and optical domains [32]. To date, quantum coherent conversion schemes based on piezo-electromechanical [33,34], magneto-optical [35], and optomechanical [36][37][38][39][40] coupling have been developed.…”

Section: K 3kmentioning

confidence: 99%

Cryogenic electro-optic interconnect for superconducting devices

Youssefi¹,

Shomroni²,

Joshi³

et al. 2020

Preprint

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Encoding information onto optical fields using electro-optical modulation is the backbone of modern telecommunication networks, offering vast bandwidth and low-loss transport via optical fibers. For these reasons, optical fibers are also replacing electrical cables for short range communications within data centers. Compared to electrical coaxial cables, optical fibers also introduce two orders of magnitude smaller heat load from room to milli-Kelvin temperatures, making optical interconnects based on electro-optical modulation an attractive candidate for interfacing superconducting quantum circuits and hybrid superconducting devices. Yet, little is known about optical modulation at cryogenic temperatures. Here we demonstrate a proof-of-principle cryogenic electro-optical interconnect, showing that currently employed Ti-doped lithium niobate phase modulators are compatible with operation down to 800mK ---below the typical operation temperature of conventional microwave amplifiers based on high electron mobility transistors (HEMTs)---and maintain their room temperature Pockels coefficient. We utilize cryogenic electro-optical modulation to perform spectroscopy of a superconducting circuit optomechanical system, measuring optomechanically induced transparency (OMIT). In addition, we encode thermomechanical sidebands from the microwave domain onto an optical signal processed at room temperature. Although the currently achieved noise figure is significantly higher than that of a typical HEMT, substantial noise reduction should be attainable by harnessing recent advances in integrated modulators, by increasing the modulator length, or by using materials with a higher electro-optic coefficient, leading to noise levels on par with HEMTs. Our work highlights the potential of electro-optical modulators for massively parallel readout for emerging quantum computing or cryogenic classical computing platforms.

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“…However, optical single-photon generation protocols are often probabilistic rather than deterministic, limiting success probability [6]. Moreover, conversion of quantum information stored in superconducting qubits operated in the microwave regime to optical photons suffers from low efficiency and limited bandwidth [7,8]. Schemes focused on generating photons at microwave frequencies and their characterization are therefore of great interest.…”

mentioning

confidence: 99%

On-demand generation and characterization of a microwave time-bin qubit

et al. 2020

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Superconducting circuits offer a scalable platform for the construction of large-scale quantum networks where information can be encoded in multiple temporal modes of propagating microwaves. Characterization of such microwave signals with a method extendable to an arbitrary number of temporal modes with a single detector and demonstration of their phase-robust nature are of great interest. Here we show the on-demand generation and Wigner tomography of a microwave timebin qubit with superconducting circuit quantum electrodynamics architecture. We perform the tomography with a single heterodyne detector by dynamically changing the measurement quadrature with a phase-sensitive amplifier independently for the two temporal modes. By generating and measuring the qubits with hardware lacking a shared phase reference, we demonstrate conservation of phase information in each time-bin qubit generated.

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Perspectives on quantum transduction

Cited by 220 publications

References 111 publications

Strong zero-field Förster resonances in K-Rb Rydberg systems

Strong zero-field Förster resonances in K-Rb Rydberg systems

Cryogenic electro-optic interconnect for superconducting devices

On-demand generation and characterization of a microwave time-bin qubit

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