Quantum Gates between Multi-modal Quantum Circuits

ORAL

Abstract

Maximum interqubit connectivity and ability to do fast multiqubit operation are key ingredients towards building an efficient quantum processor. We have recently demonstrated trimon, a multimodal device[1,2] with all-to-all longitudinal coupling as a three-qubit quantum processor[3]. Always on strong longitudinal coupling and maximum interqubit interactions in such devices lead to simple implementation of fast high fidelity multi-qubit gates. In order to scale up, we propose to use the trimon as a building block for a larger quantum processor using cross resonance drive[4] to turn on interaction between two such units. We will first discuss the coupling of a transmon and a longitudinally coupled two-qubit device named dimon, and explain how to construct a two-qubit CNOT gate. We will present preliminary experimental data and discuss extensions to gates between multiple dimon/trimon blocks. Finally, we will discuss the possibility of using dimon to improve connectivity and directionality of gates in transversely coupled multi-qubit systems.
[1] Phys. Rev. Applied 7, 054025
[2] arXiv:1711.01658
[3] arXiv:1809.00668
[4] Phys. Rev. B 81, 134507

*Department of Atomic Energy, Government of India

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Presenters

  • Sumeru Hazra

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research

Authors

  • Sumeru Hazra

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research

  • Kishor Salunkhe

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research

  • Gaurav Bothara

    • Tata Institute of Fundamental Research

  • Anirban Bhattacharjee

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • Tata Institute of Fundamental Research

  • Suman Kundu

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research

  • Meghan P. Patankar

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research

  • Tanay Roy

    • Department of Physics, University of Chicago, USA
    • Department of Physics, University of Chicago, IL, USA

  • Rajamani Vijayaraghavan

    • Department of Physics, TATA INSTITUTE OF FUNDAMENTAL RESEARCH
    • DCMP&MS, Tata Institute of Fundamental Research, Mumbai
    • Tata Institute of Fundamental Research