Merged-Element Transmons: Design and Qubit Performance

Mamin, H. J.; Huang, Enyi; Carnevale, Santino D.; Rettner, C. T.; Arellano, Noel; Sherwood, Mark; Kurter, Cihan; Trimm, B.; Sandberg, Martin; Shelby, R. M.; Mueed, M. A.; Madon, Benjamin; Pushp, Aakash; Steffen, Matthias; Rugar, D.

doi:10.1103/physrevapplied.16.024023

Cited by 39 publications

(17 citation statements)

References 28 publications

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“…Interestingly, values for AlOx tunnel barriers from measurements of merged element transmons [339] and Cooper pair boxes [54] suggest much smaller values (below 10 -6 ) than those typically reported for AlOx films (~10 -3 ). Such uncertainty underscores the importance of considering the density and distribution of TLS [134] within constituent elements of the qubit; is there a threshold size [340] below which continuum descriptions of TLS behavior are no longer relevant?…”

Section: Conclusion and Future Outlookmentioning

confidence: 62%

Material matters in superconducting qubits

Murray

2021

Materials Science and Engineering: R: Reports

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Section: Conclusion and Future Outlookmentioning

confidence: 62%

Material matters in superconducting qubits

Murray

2021

Materials Science and Engineering: R: Reports

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“…This mechanism is local and affects each qubit independently. Because the parity switching rate Γ P can be reduced by one to two orders of magnitude with simple engineering of the device geometry, e.g., using the capping technique and reducing the qubit footprint, novel miniaturized qubit designs [43][44][45] may be advantageous in this regard. Meanwhile, further studies are required to evaluate the quasiparticle trapping effectiveness of the lower-gap capacitor pads and to optimize their design.…”

Section: Countsmentioning

confidence: 99%

Engineering superconducting qubits to reduce quasiparticles and charge noise

Pan,

Yuan,

Zhou

et al. 2022

Preprint

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“…Approaches such as protected qubits can decouple from environmental noise, but improving the constituent materials can dramatically impact qubit technology by reducing the footprint and enhancing qubit coherence. As such, new material platforms for qubits are now actively explored. − …”

mentioning

confidence: 99%

Miniaturizing Transmon Qubits Using van der Waals Materials

et al. 2021

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Quantum computers can potentially achieve an exponential speedup versus classical computers on certain computational tasks, recently demonstrated in superconducting qubit processors. However, the capacitor electrodes that comprise these qubits must be large in order to avoid lossy dielectrics. This tactic hinders scaling by increasing parasitic coupling among circuit components, degrading individual qubit addressability, and limiting the spatial density of qubits. Here, we take advantage of the unique properties of van der Waals (vdW) materials to reduce the qubit area by >1000 times while preserving the capacitance while maintaining quantum coherence. Our qubits combine conventional aluminum-based Josephson junctions with parallel-plate capacitors composed of crystalline layers of superconducting niobium diselenide and insulating hexagonal boron nitride. We measure a vdW transmon T 1 relaxation time of 1.06 μs, demonstrating a path to achieve high-qubit-density quantum processors with long coherence times, and the broad utility of layered heterostructures in low-loss, high-coherence quantum devices.

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Merged-Element Transmons: Design and Qubit Performance

Cited by 39 publications

References 28 publications

Material matters in superconducting qubits

Material matters in superconducting qubits

Engineering superconducting qubits to reduce quasiparticles and charge noise

Miniaturizing Transmon Qubits Using van der Waals Materials

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