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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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Correlated charge noise and relaxation errors in superconducting qubits
C D Wilen1, S Abdullah2, N A Kurinsky3,4
1Department of Physics, University of Wisconsin-Madison, Madison, WI, USA. cwilen@wisc.edu.
Nature
|June 17, 2021
Summary
Quantum error correction faces a challenge from correlated errors in superconducting qubits. Particle impacts cause correlated errors, necessitating new mitigation strategies for quantum computing advancement.
Area of Science:
- Quantum Computing
- Quantum Error Correction
- Superconducting Circuits
Background:
- Quantum bits (qubits) are prone to two error types: X-flips and Z-flips.
- Quantum error correction requires monitoring both error types, which is challenging due to the Heisenberg uncertainty principle.
- Correlated errors must be avoided for effective quantum error correction.
Purpose of the Study:
- To characterize error correlations in a superconducting multiqubit circuit.
- To understand the sources of correlated errors in superconducting quantum processors.
Main Methods:
- Characterization of a superconducting multiqubit circuit.
- Analysis of charge noise and qubit energy relaxation times.
- Investigation of correlated errors induced by particle impacts.
Main Results:
- Charge noise in the chip is correlated over length scales exceeding 600 micrometres.
- Discrete charge jumps transiently reduce qubit energy relaxation time across the chip.
- Correlated errors are linked to charging events and phonon-mediated quasiparticle generation from particle impacts.
Conclusions:
- Correlated errors arising from particle impacts pose a significant challenge to quantum error correction.
- Robust quantum error correction necessitates mitigation strategies against these correlated errors.
- Protecting multiqubit arrays from correlated errors is crucial for building fault-tolerant quantum computers.
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