8 papers
Long-lived memory effects in the defect bath of superconducting qubits
Abhishek Agarwal, Masum Uddin, Shroya Vaidya +5
We reveal long-lived memory effects in the defect bath of a superconducting transmon qubit through electric-field tuning of two-level system (TLS) defects coupled to the qubit. Usi…
Coulomb blockade in microscopic material defects as a source of decoherence and noise in solid-state quantum circuits
R. Banerjee, L. P. Lindoy, M. Hegedus +9
The paper identifies Coulomb blockade and microwave‑driven charge tunnelling in metallic grains as a previously unrecognised source of decoherence and noise in superconducting quan…
Preparing 100-qubit symmetry-protected topological order on a digital quantum computer
George Pennington, Kevin C. Smith, James R. Garrison +3
Symmetry-protected topological (SPT) phases extend the Landau paradigm of quantum matter by admitting distinct symmetry-preserving phases that lack any local order parameter. Demon…
Variational preparation of normal matrix product states on quantum computers
Ben Jaderberg, George Pennington, Kate V. Marshall +6
Preparing matrix product states (MPSs) on quantum computers is an essential routine in the simulation of many-body physics. However, widely-used schemes based on staircase circuits…
On the Discretization Error of the Discrete Generalized Quantum Master Equation
Ruojing Peng, Lachlan P. Lindoy, Joonho Lee
The transfer tensor method (TTM) [Cerrillo and Cao, Phys. Rev. Lett. 2014, 112, 110401] can be considered a discrete-time formulation of the Nakajima-Zwanzig quantum master equatio…
Fast-tracking and disentangling of qubit noise fluctuations using minimal-data averaging and hierarchical discrete fluctuation auto-segmentation
Abhishek Agarwal, Lachlan P. Lindoy, Deep Lall +3
Qubit noise and fluctuations of the noise over time are key factors limiting the performance of quantum computers. Characterising them with high temporal resolution is challenging…