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CMP
Credit: Jack Hobhouse

Peter Leek

Research Fellow

Sub department

  • Condensed Matter Physics

Research groups

  • Superconducting quantum devices
peter.leek@physics.ox.ac.uk
Telephone: 01865 (2)72364,01865 (2)82066
Clarendon Laboratory, room 018,104
  • About
  • Publications

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
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Multiplexed readout of superconducting qubits using a three-dimensional reentrant-cavity filter

Physical Review Applied American Physical Society (APS) 23:5 (2025) 054089

Authors:

Mustafa Bakr, Simone D Fasciati, Shuxiang Cao, Giulio Campanaro, James Wills, Mohammed Alghadeer, Michele Piscitelli, Boris Shteynas, Vivek Chidambaram, Peter J Leek
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Characterization of Nanostructural Imperfections in Superconducting Quantum Circuits

(2025)

Authors:

Mohammed Alghadeer, Simone D Fasciati, Shuxiang Cao, Michele Piscitelli, Susannah C Speller, Peter J Leek, Mustafa Bakr
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