Efficiently computing the Uhlmann fidelity for density matrices

ArXiv 2211.02623 (2022)

Authors:

Andrew J Baldwin, Jonathan A Jones

Cross-verification of independent quantum devices

Physical Review X American Physical Society 11:3 (2021) 031049

Authors:

C Greganti, TF Demarie, M Ringbauer, JA Jones, V Saggio, IA Calafell, LA Rozema, A Erhard, M Meth, L Postler, R Stricker, P Schindler, R Blatt, T Monz, P Walther, JF Fitzsimons

Abstract:

Quantum computers are on the brink of surpassing the capabilities of even the most powerful classical computers, which naturally raises the question of how one can trust the results of a quantum computer when they cannot be compared to classical simulation Here, we present a cross-verification technique that exploits the principles of measurement-based quantum computation to link quantum circuits of different input size, depth, and structure. Our technique enables consistency checks of quantum computations between independent devices, as well as within a single device. We showcase our protocol by applying it to five state-of-the-art quantum processors, based on four distinct physical architectures: nuclear magnetic resonance, superconducting circuits, trapped ions, and photonics, with up to six qubits and up to 200 distinct circuits.

Cross-verification of independent quantum devices

Institute of Electrical and Electronics Engineers (IEEE) 00 (2021) 1-1

Authors:

C Greganti, TF Demarie, M Ringbauer, JA Jones, V Saggio, IA Calafell, LA Rozema, A Erhard, M Meth, L Postler, R Stricker, P Schindler, R Blatt, T Monz, P Walther, JF Fitzsimons

Cross-verification of independent quantum devices

Optics InfoBase Conference Papers (2021)

Authors:

C Greganti, TF Demarie, M Ringbauer, JA Jones, V Saggio, IA Calafell, LA Rozema, A Erhard, M Meth, L Postler, R Stricker, P Schindler, R Blatt, T Monz, P Walther, JF Fitzsimons

Cross-verification of independent quantum devices

Optics InfoBase Conference Papers Optica Publishing Group (2021)

Authors:

C Greganti, Tf Demarie, M Ringbauer, Jonathan Jones, V Saggio, Ia Calafell, La Rozema, A Erhard, M Meth, L Postler, R Stricker, P Schindler, R Blatt, T Monz, P Walther, Jf Fitzsimons

Abstract:

Todays noisy quantum computers are pushing the limits of classical computation. We present a scalable cross-check procedure to verify their performance in a hardware agnostic way and without relying on classical simulation.