Investigating the Individual Performances of Coupled Superconducting Transmon Qubits

Condensed Matter

article

Francesco Tafuri¹  Oleg Mukhanov³  Marco Arzeo⁴  Davide Massarotti⁵  Halima Giovanna Ahmad¹  Caleb Jordan³  Roald van den Boogaart⁷  Daan Waardenburg⁷  Christos Zachariadis⁷  Pasquale Mastrovito¹  Asen Lyubenov Georgiev¹  Domenico Montemurro¹  Giovanni Piero Pepe¹  Marten Arthers⁷  Alessandro Bruno⁷ 

[1] Dipartimento di Fisica “Ettore Pancini”, Università degli Studi di Napoli “Federico II”;Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica;SEEQC, Inc.;SEEQC-EU;Consiglio Nazionale delle Ricerche—SuPerconducting and Other INnovative Materials and Devices Institute;Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione, Università degli Studi di Napoli Federico II;QuantWare

关键词: superconducting transmon qubit;    quantum computing;    scalability;    fidelity;   

DOI  :  10.3390/condmat8010029

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY