Non-degenerate Noise-Resilient Superconducting Qubit
ORAL
Abstract
We propose a superconducting qubit based on engineering of the first and second harmonics of the Josephson energy/phase relation EJ1cosφ and EJ2cos2φ. By constructing a circuit such that the energy scales of both harmonics EJ1 and EJ2 are negative, we create a periodic potential with two non-degenerate minima. The qubit is then formed from the lowest-energy states of each minimum. Bit-flip protection of the qubit arises due to the localization of each qubit state to their respective minima, while phase-flip protection can be understood by considering the circuit within the Born-Oppenheimer approximation. We discuss implementations of qubit control and readout. Finally, we estimate the qubit coherence times using numerical diagonalization of the complete circuit in conjunction with state-of-the-art noise models.
*This research is sponsored in part by the U.S. Army Research Office under Award No. W911NFF-23-1-0045 and in part by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704. M.H. is supported by an appointment to the Intelligence Community Postdoctoral Research Fellowship Program. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the U.S. Government.
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Presenters
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Max Hays
- MIT
- Massachusetts Institute of Technology (MIT)
- Massachusetts Institute of Technology