Southwest Quantum Information and Technology

Two qubit gates for the 0-π qubit

Presenting Author: Zhenxing Liu, University of Colorado Boulder
Contributing Author(s): Joshua Combes, Andras Gyenis

The transmon is the most successful superconducting qubit to date. The next generation of superconducting qubits, also known as protected qubits, are more complicated than the transmon but are expected to have longer coherence times relative to the transmon. By engineering more complicated circuits qubits are “protected” from noise by the laws of physics. The 0−π qubit is one of the most attractive candidates for a protected superconducting qubit. Since the 0−π qubit was proposed [1], it has been thoroughly investigated [2] and even experimentally realized [3]. However, a practical two-qubit gate for 0−π qubit has not yet been proposed. Here we will present the design of several two qubit gates for the 0−π qubit. Specifically, we show how to couple any degrees of freedom in one 0−π to any degrees of freedom in another 0−π circuit. References: [1] P. Brooks et al. Phys. Rev. A 87, 052306 (2013) [2] A. D. Paolo et al. New J. Phys. 21, 043002 (2019). [3] A. Gyenis et al. PRX Quantum 2, 010339 (2021).

(Session 5 : Thursday from 5:00 pm - 7:00 pm)