High coherence 2D Kerr-cat qubit: Experimental realization and technical challenges (1/2)

ORAL

Abstract



The Kerr-cat qubit is a bosonic qubit in which the information is encoded in multi-photon cat states. The suppressed bit flip rate makes this qubit a promising candidate to implement quantum error correction codes tailored for noise-biased qubits. Moreover, its intrinsic nonlinearities enable fast logic gates and QND measurement. However, the strong two-photon pump drive, which stabilizes the cat-state, introduces both theoretical and practical challenges when large cat sizes or multi-qubit operations are desired. Here, we present an experimental realization of high-coherence Kerr-cat qubits in a 2D superconducting circuit. With a novel on-chip filter that significantly increases the qubit-pump coupling, we can generate large cats with smaller drive power and explore the bit-flip dependence on the cat size. With bit-flip times approaching 800us for a cat of size 11 photon our work paves the way towards high-coherence and scalable multi-qubit devices.

The talk is divided into two parts. This is the first part, which will discuss the motivation, concept, and design.

* Research was sponsored by the Army Research Office and was accomplished under Grant Number W911NF-23-1-0323. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the U.S. Government.

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Presenters

  • AHMED HAJR

    University of California, Berkeley

Authors

  • AHMED HAJR

    University of California, Berkeley

  • Bingcheng Qing

    University of California, Berkeley

  • Ke Wang

    University of California, Berkeley, UC Berkeley

  • Zahra Pedramrazi

    University of California, Berkeley

  • Long B Nguyen

    University of California, Berkeley, UC Berkeley

  • Irwin Huang

    University of Rochester

  • Bibek Bhandari

    Institute for Quantum Studies, Chapman University, Chapman University

  • Christian Juenger

    University of California, Berkeley

  • Gerwin Koolstra

    University of California, Berkeley

  • David I Santiago

    Lawrence Berkeley National Laboratory

  • Justin G Dressel

    Chapman Univ, Chapman University

  • Andrew N Jordan

    University of Rochester, Chapman University

  • Irfan Siddiqi

    University of California, Berkeley