Investigating the Individual Performances of Coupled Superconducting Transmon Qubits

Year: 2023

Authors: Ahmad HG., Jordan C., van den Boogaart R., Waardenburg D., Zachariadis C., Mastrovito P., Georgiev AL., Montemurro D., Pepe GP., Arthers M., Bruno A., Tafuri F., Mukhanov O., Arzeo M., Massarotti D.

Autors Affiliation: Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, Complesso Monte St Angelo, Via Cinthia, I-80126 Naples, Italy; CNR, SuPerconducting & Other INnovat Mat & Devices Inst, Complesso Monte St Angelo, Via Cinthia, I-80126 Naples, Italy; SEEQC Inc, 150 Clearbrook Rd,Suite 170, Elmsford, NY 10523 USA; QuantWare, Elektronicaweg 10, NL-2628 XG Delft, Netherlands; CNR, Ist Nazl Ott CNR INO, Largo Enr Fermi 6, I-50125 Florence, Italy; SEEQC EU, Str Vicinale Cupa Cinthia 21, I-80126 Naples, Italy; Univ Napoli Federico II, Dipartimento Ingn Elettr & Tecnol Informaz, I-80125 Naples, Italy; Phys Tech Bundesanstalt PTB, Bundesallee 100, D-38116 Braunschweig, Germany.

Abstract: The strong requirement for high-performing quantum computing led to intensive research on novel quantum platforms in the last decades. The circuital nature of Josephson-based quantum superconducting systems powerfully supports massive circuital freedom, which allowed for the implementation of a wide range of qubit designs, and an easy interface with the quantum processing unit. However, this unavoidably introduces a coupling with the environment, and thus to extra decoherence sources. Moreover, at the time of writing, control and readout protocols mainly use analogue microwave electronics, which limit the otherwise reasonable scalability in superconducting quantum circuits. Within the future perspective to improve scalability by integrating novel control energy-efficient superconducting electronics at the quantum stage in a multi-chip module, we report on an all-microwave characterization of a planar two-transmon qubits device, which involves state-of-the-art control pulses optimization. We demonstrate that the single-qubit average gate fidelity is mainly limited by the gate pulse duration and the quality of the optimization, and thus does not preclude the integration in novel hybrid quantum-classical superconducting devices.

Journal/Review: CONDENSED MATTER

Volume: 8 (1)      Pages from: 29-1  to: 29-19

More Information: The work was supported by the project SFQ4QPU, Eurostars 115636, Code: ES21COD15_00043, the project SQUAD-On-chip control and advanced read-out for superconducting qubit arrays, Programma STAR PLUS 2020, Finanziamento della Ricerca di Ateneo, University of Napoli Federico II, the project SuperLink – Superconducting quantum-classical linked computing systems, call QuantERA2 ERANET COFUND, CUP B53C22003320005, the PNRRMUR project PE0000023-NQSTI and the PNRR MUR project CN_00000013 -ICSC.
KeyWords: superconducting transmon qubit; quantum computing; scalability; fidelity
DOI: 10.3390/condmat8010029

ImpactFactor: 1.900
Citations: 3
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