Diagnostics of quantum-gate coherences deteriorated by unitary errors via end-point-measurement statistics

Year: 2023

Authors: Gianani I.; Belenchia A.; Gherardini S.; Berardi V.; Barbieri M.; Paternostro P.

Autors Affiliation: Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy; Eberhard Karls Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany; Queens Univ Belfast, Ctr Quantum Mat & Technol, Sch Math & Phys, Belfast BT7 1NN, North Ireland; CNR, Ist Nazl Ott, Area Sci Pk, I-34149 Trieste, Italy; Univ Florence, LENS, Via Carrara 1, I-50019 Sesto Fiorentino, Italy; Politecn Bari, Dipartimento Interateneo Fis Michelangelo Merlin, Via Orabona 4, I-70126 Bari, Italy; CNR, Ist Nazl Ott, Largo Enrico Fermi 6, I-50125 Florence, Italy.

Abstract: Quantum coherence is a central ingredient in quantum physics with several theoretical and technological ramifications. We consider a figure of merit encoding the information on how the coherence generated on average by a quantum gate is affected by unitary errors (coherent noise sources) in the form of rotation-angle and rotation-axis errors. We provide numerical evidences that such information is well captured by the statistics of local energy measurements on the output states of the gate. These findings are then corroborated by experimental data taken in a quantum optics setting.

Journal/Review: QUANTUM SCIENCE AND TECHNOLOGY

Volume: 8 (4)      Pages from: 045018-1  to: 045018-12

More Information: We acknowledge support from the European Union´s Horizon 2020 FET-Open Projects TEQ (Grant Agreement No.?766900) and STORMYTUNE (Grant Agreement No.?899587), the Horizon Europe EIC Pathfinder Project QuCoM (Grant Agreement No.?101046973), the Leverhulme Trust Research Project Grant UltraQuTe (Grant RGP-2018-266), the Royal Society Wolfson Fellowship (RSWF/R3/183013), the UK EPSRC (Grant EP/T028424/1), the Department for the Economy Northern Ireland under the US-Ireland R & amp;D Partnership Programme, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project number BR 5221/4-1, the Blanceflor Foundation for financial support through the project The theRmodynamics behInd thE meaSuremenT postulate of quantum mEchanics (TRIESTE)´.
KeyWords: Quantum-gate coherences, Diagnostics methods, Unitary errors, End-point measurement scheme, Quantum optics
DOI: 10.1088/2058-9565/acedca

Citations: 5
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