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Qubits

Dr Shuxiang Cao

Long Term Visitor

Research theme

  • Quantum information and computation

Sub department

  • Condensed Matter Physics

Research groups

  • Superconducting quantum devices
shuxiang.cao@physics.ox.ac.uk
Clarendon Laboratory, room 120,030
  • About
  • Publications

Agents for self-driving laboratories applied to quantum computing

(2024)

Authors:

Shuxiang Cao, Zijian Zhang, Mohammed Alghadeer, Simone D Fasciati, Michele Piscitelli, Mustafa Bakr, Peter Leek, Alán Aspuru-Guzik
Details from ArXiV

Efficient Characterization of Qudit Logical Gates with Gate Set Tomography Using an Error-Free Virtual Z Gate Model.

Physical review letters 133:12 (2024) 120802

Authors:

Shuxiang Cao, Deep Lall, Mustafa Bakr, Giulio Campanaro, Simone D Fasciati, James Wills, Vivek Chidambaram, Boris Shteynas, Ivan Rungger, Peter J Leek

Abstract:

Gate set tomography (GST) characterizes the process matrix of quantum logic gates, along with measurement and state preparation errors in quantum processors. GST typically requires extensive data collection and significant computational resources for model estimation. We propose a more efficient GST approach for qudits, utilizing the qudit Hadamard and virtual Z gates to construct fiducials while assuming virtual Z gates are error-free. Our method reduces the computational costs of estimating characterization results, making GST more practical at scale. We experimentally demonstrate the applicability of this approach on a superconducting transmon qutrit.
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Characterization of nanostructural imperfections in superconducting quantum circuits

Materials for Quantum Technology IOP Publishing 5:3 (2025) 035201

Authors:

Mohammed Alghadeer, Simone D Fasciati, Shuxiang Cao, Michele Piscitelli, Matthew C Spink, David G Hopkinson, Mohsen Danaie, Susannah C Speller, Peter J Leek, Mustafa Bakr

Abstract:

Decoherence in superconducting quantum circuits, caused by loss mechanisms like material imperfections and two-level system (TLS) defects, remains a major obstacle to improving the performance of quantum devices. In this work, we present atomic-level characterization of cross-sections of a Josephson junction and a spiral resonator to assess the quality of critical interfaces. Employing scanning transmission electron microscopy combined with energy-dispersive x-ray spectroscopy and electron-energy loss spectroscopy, we identify structural imperfections associated with oxide layer formation and carbon-based contamination, and correlate these imperfections to the patterning and etching steps in the fabrication process and environmental exposure. These results suggest that TLS imperfections at critical interfaces significantly contribute to limiting device performance, emphasizing the need for an improved fabrication process.
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Intrinsic Multi-Mode Interference for Passive Suppression of Purcell Decay in Superconducting Circuits

(2025)

Authors:

Mustafa Bakr, Mohammed Alghadeer, Simon Pettersson Fors, Simone D Fasciati, Shuxiang Cao, Atharv Mahajan, Smain Amari, Anton Frisk Kockum, Peter Leek

Low Crosstalk in a Scalable Superconducting Quantum Lattice

(2025)

Authors:

Mohammed Alghadeer, Shuxiang Cao, Simone D Fasciati, Michele Piscitelli, Paul C Gow, James C Gates, Mustafa Bakr, Peter J Leek
More details from the publisher

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