Demonstration of superconducting micromachined cavities

Brecht, T.; Reagor, Matthew; Chu, Yiwen; Pfaff, Wolfgang; Wang, C.; Frunzio, Luigi; Devoret, Michel; Schoelkopf, Robert

doi:10.48550/arxiv.1509.01119

2015

DOI: 10.48550/arxiv.1509.01119

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Demonstration of superconducting micromachined cavities

T. Brecht¹,

Matthew Reagor²,

Yiwen Chu³

et al.

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Cited by 2 publications

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“…We believe similarly-fabricated qubits performing substantially worse than this surface-loss line are limited by other mechanisms. Early generation of planar transmons may incur losses due to non-equilibrium quasiparticles or lossy components of the device package 29 , and the 3D "vertical" transmons 34 may be severely limited by conduction loss across the cavity seam 38 .…”

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confidence: 99%

Surface participation and dielectric loss in superconducting qubits

Wang

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Gao

et al. 2015

Applied Physics Letters

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We study the energy relaxation times ($T_1$) of superconducting transmon qubits in 3D cavities as a function of dielectric participation ratios of material surfaces. This surface participation ratio, representing the fraction of electric field energy stored in a dissipative surface layer, is computed by a two-step finite-element simulation and experimentally varied by qubit geometry. With a clean electromagnetic environment and suppressed non-equilibrium quasiparticle density, we find an approximately proportional relation between the transmon relaxation rates and surface participation ratios. These results suggest dielectric dissipation arising from material interfaces is the major limiting factor for the $T_1$ of transmons in 3D cQED architecture. Our analysis also supports the notion of spatial discreteness of surface dielectric dissipation.Comment: Main text: 5 pages 4 figures; Supplementary Materials: 6 pages 4 figures 1 tabl

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confidence: 99%

Surface participation and dielectric loss in superconducting qubits

Wang

Axline

Gao

et al. 2015

Applied Physics Letters

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280

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“…As described in Ref. [28], we find that many of the above challenges can be addressed through the selection of appropriate methods and materials.…”

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confidence: 89%

“…In a proof-of-principle experiment described in Ref. [28], we have demonstrated a 3D micromachined resonator with a high quality superconducting seam and planar multilayer coupling, which are two key components of the architecture presented here. We foresee that various other components including qubits and amplifiers can be readily incorporated in this multilayer geometry.…”

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confidence: 94%

“…Some contain input and output circuitry, while others are 3D cavity resonators coupled to qubits. [28] In this 3D geometry, both qubits and resonators have been shown to experience substantial gains in coherence times. [29] The use of intentionally designed 3D modes as quantum elements also alleviates the need for suppressing spurious package modes.…”

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confidence: 99%

“…ings to achieve the higher Q required for storing quantum states. [28] Another important feature of the MMIQC is the use of shielded, low-loss, superconducting transmission lines connecting elements on the same layer (Figure 2c) and vertical interconnects to provide coupling between layers. Micromachining has been used to remove substrate in both normal metal and superconducting transmission lines to reduce dielectric loss.…”

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confidence: 99%

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Multilayer microwave integrated quantum circuits for scalable quantum computing

et al. 2016

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As experimental quantum information processing (QIP) rapidly advances, an emerging challenge is to design a scalable architecture that combines various quantum elements into a complex device without compromising their performance. In particular, superconducting quantum circuits have successfully demonstrated many of the requirements for quantum computing, including coherence levels that approach the thresholds for scaling. However, it remains challenging to couple a large number of circuit components through controllable channels while suppressing any other interactions. We propose a hardware platform intended to address these challenges, which combines the advantages of integrated circuit fabrication and the long coherence times achievable in three-dimensional circuit quantum electrodynamics. This multilayer microwave integrated quantum circuit platform provides a path towards the realisation of increasingly complex superconducting devices in pursuit of a scalable quantum computer. INTRODUCTIONExperimental quantum information processing is rapidly developing in several physical implementations, and superconducting quantum circuits are particularly promising candidates for building a practical quantum computer. 1,2 In these systems, qubits made with Josephson junctions behave like macroscopic atoms with quantised energy levels in the microwave domain. Coupling them to resonators forms a powerful platform known as circuit quantum electrodynamics (cQED) 3,4 that shares several important advantages with classical computing architectures: For one, devices are created in the solid state and their properties can be fully engineered through circuit design and mass produced by lithographic fabrication. Further, electromagnetically coupling qubits to superconducting transmission lines enables communication of quantum information, rapid multi-qubit gates and entangling operations between elements on or off the chip. 2,[5][6][7][8][9] Finally, electronic control and measurement are achieved through microwave signals carried to and from the device by wires and cables. This capacity for quantum electrical engineering of devices allows the lifetimes of quantum states to continually rise due to improvements in design and selection of high-quality materials. As a consequence, superconducting circuits fulfil many of the necessary requirements for universal quantum computation, as evidenced by recent experimental realisations of a large suite of desired building blocks. [10][11][12] In general, scaling up quantum information devices will require connecting orders of magnitude more circuit elements than today's experimental devices without sacrificing coherence. In particular, building a fully functional, fault-tolerant quantum computer requires error rates to remain below the threshold for quantum error correction. 13,14 At the same time, the different components must retain the ability to selectively interact with each other while being externally addressed and accurately controlled. Finally, they must be mass producible in a r...

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Demonstration of superconducting micromachined cavities

Cited by 2 publications

References 0 publications

Surface participation and dielectric loss in superconducting qubits

Surface participation and dielectric loss in superconducting qubits

Multilayer microwave integrated quantum circuits for scalable quantum computing

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