Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems

Magnard, Paul; Storz, Simon; Kurpiers, Philipp; Schär, Josua; Marxer, Fabian; Lütolf, Janis; Walter, Theo; Besse, Jean-Claude; Gabureac, Mihai; Reuer, Kevin; Akın, Abdulkadir; Royer, Baptiste; Blais, Alexandre; Wallraff, Andreas

doi:10.1103/physrevlett.125.260502

Cited by 130 publications

(102 citation statements)

References 52 publications

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“…Heralded entanglement protocols, whereby entanglement is generated probabilistically, have now reached entanglement rates up to 200 Hz [6][7][8][9][10][11][12] . Superconducting systems have established direct exchange of quantum information over cryogenic microwave channels [13][14][15][16][17][18] , which is particularly useful toward interconnects of intermediate range such as between dilution refrigerators. Yet, in the context of superconducting qubit based processors, none of these methods are likely to outperform local gates between qubits, which can achieve coupling rates in the tens of MHz and fidelities reaching 99.9% [19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Entanglement across separate silicon dies in a modular superconducting qubit device

et al. 2021

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Assembling future large-scale quantum computers out of smaller, specialized modules promises to simplify a number of formidable science and engineering challenges. One of the primary challenges in developing a modular architecture is in engineering high fidelity, low-latency quantum interconnects between modules. Here we demonstrate a modular solid state architecture with deterministic inter-module coupling between four physically separate, interchangeable superconducting qubit integrated circuits, achieving two-qubit gate fidelities as high as 99.1 ± 0.5% and 98.3 ± 0.3% for iSWAP and CZ entangling gates, respectively. The quality of the inter-module entanglement is further confirmed by a demonstration of Bell-inequality violation for disjoint pairs of entangled qubits across the four separate silicon dies. Having proven out the fundamental building blocks, this work provides the technological foundations for a modular quantum processor: technology which will accelerate near-term experimental efforts and open up new paths to the fault-tolerant era for solid state qubit architectures.

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Section: Introductionmentioning

confidence: 99%

Entanglement across separate silicon dies in a modular superconducting qubit device

et al. 2021

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“…Moreover, a technological backbone for such superconducting quantum networks is already available in the form of microwave cryogenic links. These cryolinks have several promising advantages over optical links: (i) very high quantum efficiencies for single-photon transmission due to the absence of frequency transduction and (ii) comparatively straightforward technical implementation ( 34 ). The demonstrated microwave QT results, in combination with the aforementioned technological advances, bring quantum local area networks between superconducting quantum computers withing reach.…”

Section: Discussionmentioning

confidence: 99%

Experimental quantum teleportation of propagating microwaves

et al. 2021

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“…In the space of microwave links, the work of [49] shows that superconducting qubits and microwave links can couple at high efficiency, mediated by coupling resonators. The systems in [50] and [51] demonstrate high-fidelity (80-91%) qubit state transfer and entanglement between two nodes separated by a meter within one DR and five meters between separated cryostats, respectively. Similarly, [52] describes SWAP operations between four quantum modules, each containing a single qubit, with a microwave quantum state router.…”

Section: B Ongoing Work In Short-range Link Hardwarementioning

confidence: 99%

Modeling Short-Range Microwave Networks to Scale Superconducting Quantum Computation

LaRacuente¹,

Smith²,

Imany³

et al. 2022

Preprint

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A core challenge for superconducting quantum computers is to scale up the number of qubits in each processor without increasing noise or cross-talk. Distributing a quantum computer across nearby small qubit arrays, known as chiplets, could solve many problems associated with size. We propose a chiplet architecture over microwave links with potential to exceed monolithic performance on near-term hardware. We model and evaluate the chiplet architecture in a way that bridges the physical and network layers. We find concrete evidence that distributed quantum computing may accelerate the path toward useful and ultimately scalable quantum computers. In the long-term, short-range networks may underlie quantum computers just as local area networks underlie classical datacenters and supercomputers today.

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Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems

Cited by 130 publications

References 52 publications

Entanglement across separate silicon dies in a modular superconducting qubit device

Entanglement across separate silicon dies in a modular superconducting qubit device

Experimental quantum teleportation of propagating microwaves

Modeling Short-Range Microwave Networks to Scale Superconducting Quantum Computation

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