4 papers
Procrustes Tomography -- reconstructing noisy quantum channels made easy
Josey Stevens, Reece Robertson, Sebastian Deffner
What is the most expensive part of quantum device characterization? Clearly, the answer is quantum process tomography. However, especially for noisy intermediate-scale quantum (NIS…
Energy-error tradeoff in encoding quantum error correction
Josey Stevens, Sebastian Deffner
While it has been widely recognized that genuine quantum advantage for practical problems might only be achieved with fault-tolerant quantum computers, it is still not entirely cle…
Variational Gibbs State Preparation on Trapped-Ion Devices
Reece Robertson, Mirko Consiglio, Josey Stevens +3
We implement a variational quantum algorithm for Gibbs state preparation of a transverse-field Ising model on IonQ's quantum computers. To this end, we train the variational parame…
Hamiltonian quantum gates -- energetic advantage from entangleability
Josey Stevens, Sebastian Deffner
Hamiltonian quantum gates controlled by classical electromagnetic fields form the basis of any realistic model of quantum computers. In this letter, we derive a lower bound on the…