1
|
Weaver MJ, Duivestein P, Bernasconi AC, Scharmer S, Lemang M, Thiel TCV, Hijazi F, Hensen B, Gröblacher S, Stockill R. An integrated microwave-to-optics interface for scalable quantum computing. NATURE NANOTECHNOLOGY 2024; 19:166-172. [PMID: 37798565 DOI: 10.1038/s41565-023-01515-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 08/31/2023] [Indexed: 10/07/2023]
Abstract
Microwave-to-optics transduction is emerging as a vital technology for scaling quantum computers and quantum networks. To establish useful entanglement links between qubit processing units, several key conditions must be simultaneously met: the transducer must add less than a single quantum of input-referred noise and operate with high efficiency, as well as large bandwidth and high repetition rate. Here we present a design for an integrated transducer based on a planar superconducting resonator coupled to a silicon photonic cavity through a mechanical oscillator made of lithium niobate on silicon. We experimentally demonstrate its performance with a transduction efficiency of 0.9% with 1 μW of continuous optical power and a spectral bandwidth of 14.8 MHz. With short optical pulses, we measure the added noise that is limited to a few photons, with a repetition rate of up to 100 kHz. Our device directly couples to a 50 Ω transmission line and can be scaled to a large number of transducers on a single chip, laying the foundations for distributed quantum computing.
Collapse
|
2
|
Sahu R, Qiu L, Hease W, Arnold G, Minoguchi Y, Rabl P, Fink JM. Entangling microwaves with light. Science 2023; 380:718-721. [PMID: 37200415 DOI: 10.1126/science.adg3812] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 04/19/2023] [Indexed: 05/20/2023]
Abstract
Quantum entanglement is a key resource in currently developed quantum technologies. Sharing this fragile property between superconducting microwave circuits and optical or atomic systems would enable new functionalities, but this has been hindered by an energy scale mismatch of >104 and the resulting mutually imposed loss and noise. In this work, we created and verified entanglement between microwave and optical fields in a millikelvin environment. Using an optically pulsed superconducting electro-optical device, we show entanglement between propagating microwave and optical fields in the continuous variable domain. This achievement not only paves the way for entanglement between superconducting circuits and telecom wavelength light, but also has wide-ranging implications for hybrid quantum networks in the context of modularization, scaling, sensing, and cross-platform verification.
Collapse
Affiliation(s)
- R Sahu
- Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria
| | - L Qiu
- Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria
| | - W Hease
- Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria
| | - G Arnold
- Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria
| | - Y Minoguchi
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1040 Vienna, Austria
| | - P Rabl
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1040 Vienna, Austria
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Technische Universität München, TUM School of Natural Sciences, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
| | - J M Fink
- Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria
| |
Collapse
|
3
|
Ultra-low-noise microwave to optics conversion in gallium phosphide. Nat Commun 2022; 13:6583. [PMID: 36323690 PMCID: PMC9630281 DOI: 10.1038/s41467-022-34338-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 10/21/2022] [Indexed: 11/06/2022] Open
Abstract
Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains due to their high quality factors. Nevertheless, the optical pump required to overcome the large energy difference between the frequencies can add significant noise to the transduced signal. Here we exploit the remarkable properties of thin-film gallium phosphide to demonstrate bi-directional on-chip conversion between microwave and optical frequencies, realized by piezoelectric actuation of a Gigahertz-frequency optomechanical resonator. The large optomechanical coupling and the suppression of two-photon absorption in the material allows us to operate the device at optomechanical cooperativities greatly exceeding one. Alternatively, when using a pulsed upconversion pump, we demonstrate that we induce less than one thermal noise phonon. We include a high-impedance on-chip matching resonator to mediate the mechanical load with the 50-Ω source. Our results establish gallium phosphide as a versatile platform for ultra-low-noise conversion of photons between microwave and optical frequencies.
Collapse
|
4
|
Asjad M, Qasymeh M, Eleuch H. A local area quantum teleportation network based on an array of electrically activated graphene waveguides. OPTICS EXPRESS 2022; 30:21016-21027. [PMID: 36224832 DOI: 10.1364/oe.457476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/11/2022] [Indexed: 06/16/2023]
Abstract
We present a scheme to generate a continuous variable (CV) multipartite entangled state using an array of plasmonic graphene waveguides that are activated by nonclassical driving microwave modes. Within this scheme, we can exploit the interaction of two light fields coupled to the same microwave mode in each waveguide to produce any type of multipartite Gaussian entangled state. A teleportation network is illustrated using the resultant CV multipartite entangled state. In particular, the proposed setup enables coherent state teleportation across remotely connected nodes with fidelity above a threshold limit of 2/3, providing secure quantum teleportation networking even in the presence of losses.
Collapse
|
5
|
Rau CL, Kyle A, Kwiatkowski A, Shojaee E, Teufel JD, Lehnert KW, Dennis T. Entanglement Thresholds of Doubly Parametric Quantum Transducers. PHYSICAL REVIEW APPLIED 2022; 17:10.1103/physrevapplied.17.044057. [PMID: 36632278 PMCID: PMC9830939 DOI: 10.1103/physrevapplied.17.044057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Doubly parametric quantum transducers, such as electro-optomechanical devices, show promise for providing the critical link between quantum information encoded in highly disparate frequencies such as in the optical and microwave domains. This technology would enable long-distance networking of superconducting quantum computers. Rapid experimental progress has resulted in impressive reductions in decoherence from mechanisms such as thermal noise, loss, and limited cooperativities. However, the fundamental requirements on transducer parameters necessary to achieve quantum operation have yet to be characterized. In this work we find simple, protocol-independent expressions for the necessary and sufficient conditions under which doubly parametric transducers in the resolved-sideband, 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 beamsplitter-type interaction, we find parameter thresholds that distinguish regions of the channel's separability, capacity for bound entanglement, and capacity for distillable entanglement. By contrast, the two-mode squeezing-type interaction always produces distillable entanglement with no restrictions on temperature, cooperativities, or losses. Counterintuitively, for both interactions, we find that achieving quantum operation does not require either a quantum cooperativity exceeding one, or ground-state cooling of the mediating mode. Finally, we discuss where two state-of-the-art implementations are relative to these thresholds and show that current devices operating in either mode of operation are in principle capable of entangling optical and microwave modes.
Collapse
Affiliation(s)
- Curtis L. Rau
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| | - Akira Kyle
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| | - Alex Kwiatkowski
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| | - Ezad Shojaee
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| | - John D. Teufel
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| | - Konrad W. Lehnert
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
- JILA, University of Colorado and NIST, Boulder, Colorado 80309, USA
| | - Tasshi Dennis
- National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA
| |
Collapse
|
6
|
Quantum-enabled operation of a microwave-optical interface. Nat Commun 2022; 13:1276. [PMID: 35277488 PMCID: PMC8917169 DOI: 10.1038/s41467-022-28924-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 02/15/2022] [Indexed: 11/08/2022] Open
Abstract
Solid-state microwave systems offer strong interactions for fast quantum logic and sensing but photons at telecom wavelength are the ideal choice for high-density low-loss quantum interconnects. A general-purpose interface that can make use of single photon effects requires < 1 input noise quanta, which has remained elusive due to either low efficiency or pump induced heating. Here we demonstrate coherent electro-optic modulation on nanosecond-timescales with only [Formula: see text] microwave input noise photons with a total bidirectional transduction efficiency of 8.7% (or up to 15% with [Formula: see text]), as required for near-term heralded quantum network protocols. The use of short and high-power optical pump pulses also enables near-unity cooperativity of the electro-optic interaction leading to an internal pure conversion efficiency of up to 99.5%. Together with the low mode occupancy this provides evidence for electro-optic laser cooling and vacuum amplification as predicted a decade ago.
Collapse
|