Optimizing Hardware Compatibility for Scaling Up Superconducting Qubits

ORAL

Abstract

Since quantum computation relies on the manipulation of fragile quantum states, qubit devices must be isolated from the noisy environment to prevent decoherence. Custom made components make isolation from thermal and infrared radiation possible, but have been unreliable, massive, and show sub-ideal microwave performance. Infrared isolation for large scale experiments (> 8 qubits) was achieved with compact impedance matched microwave filters which attenuate stray infrared signals on cryogenic cables with only -25 dB reflection up to 7.5 GHz. In addition, a thermal anchoring system was designed to effectively transfer unwanted heat from more than 100 coaxial cables in the dilution refrigerator and yielded a 33 percent improvement in base temperature and 50\% improvement in hold time.

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Authors

  • Michael Fang

    • Univ of California - Santa Barbara

  • Brooks Campbell

    • University of California, Santa Barbara

  • Zijun Chen

    • University of California, Santa Barbara

  • Ben Chiaro

    • University of California, Santa Barbara

  • Andrew Dunsworth

    • University of California, Santa Barbara

  • Julian Kelly

    • University of California, Santa Barbara

  • Anthony Megrant

    • University of California, Santa Barbara

  • Charles Neill

    • University of California, Santa Barbara

  • Peter O'Malley

    • University of California, Santa Barbara

  • Chris Quintana

    • University of California, Santa Barbara

  • Amit Vainsencher

    • University of California, Santa Barbara

  • Jim Wenner

    • University of California, Santa Barbara

  • Ted White

    • University of California, Santa Barbara

  • Rami Barends

    • Google, Santa Barbara

  • Yu Chen

    • Google, Santa Barbara

  • Austin Fowler

    • Google, Santa Barbara

  • Evan Jeffrey

    • Google, Santa Barbara

  • Josh Mutus

    • Google, Santa Barbara

  • Pedram Roushan

    • Google, Santa Barbara

  • Daniel Sank

    • Google, Santa Barbara

  • John Martinis

    • University of California and Google, Santa Barbara