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Coherent control of macroscopic quantum states in a single-Cooper-pair box

Author

Listed:
  • Y. Nakamura

    (NEC Fundamental Research Laboratories)

  • Yu. A. Pashkin

    (CREST, Japan Science and Technology Corporation (JST))

  • J. S. Tsai

    (NEC Fundamental Research Laboratories)

Abstract

A nanometre-scale superconducting electrode connected to a reservoir via a Josephson junction constitutes an artificial two-level electronic system: a single-Cooper-pair box. The two levels consist of charge states (differing by 2e, where e is the electronic charge) that are coupled by tunnelling of Cooper pairs through the junction. Although the two-level system is macroscopic, containing a large number of electrons, the two charge states can be coherently superposed1,2,3,4. The Cooper-pair box has therefore been suggested5,6,7 as a candidate for a quantum bit or ‘qubit’—the basic component of a quantum computer. Here we report the observation of quantum oscillations in a single-Cooper-pair box. By applying a short voltage pulse via a gate electrode, we can control the coherent quantum state evolution: the pulse modifies the energies of the two charge states non-adiabatically, bringing them into resonance. The resulting state—a superposition of the two charge states—is detected by a tunnelling current through a probe junction. Our results demonstrate electrical coherent control of a qubit in a solid-state electronic device.

Suggested Citation

  • Y. Nakamura & Yu. A. Pashkin & J. S. Tsai, 1999. "Coherent control of macroscopic quantum states in a single-Cooper-pair box," Nature, Nature, vol. 398(6730), pages 786-788, April.
  • Handle: RePEc:nat:nature:v:398:y:1999:i:6730:d:10.1038_19718
    DOI: 10.1038/19718
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    1. F. Hassani & M. Peruzzo & L. N. Kapoor & A. Trioni & M. Zemlicka & J. M. Fink, 2023. "Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Gupta, Shivam & Modgil, Sachin & Bhatt, Priyanka C. & Chiappetta Jabbour, Charbel Jose & Kamble, Sachin, 2023. "Quantum computing led innovation for achieving a more sustainable Covid-19 healthcare industry," Technovation, Elsevier, vol. 120(C).
    3. Humire, Fernando R. & Zárate, Yair D. & Joglekar, Yogesh N. & García-Ñustes, Mónica A., 2023. "Classical Rabi oscillations induced by unbalanced dissipation on a nonlinear dimer," Chaos, Solitons & Fractals, Elsevier, vol. 171(C).
    4. Daisuke Iyama & Takahiko Kamiya & Shiori Fujii & Hiroto Mukai & Yu Zhou & Toshiaki Nagase & Akiyoshi Tomonaga & Rui Wang & Jiao-Jiao Xue & Shohei Watabe & Sangil Kwon & Jaw-Shen Tsai, 2024. "Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    5. Xianchuang Pan & Yuxuan Zhou & Haolan Yuan & Lifu Nie & Weiwei Wei & Libo Zhang & Jian Li & Song Liu & Zhi Hao Jiang & Gianluigi Catelani & Ling Hu & Fei Yan & Dapeng Yu, 2022. "Engineering superconducting qubits to reduce quasiparticles and charge noise," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    6. Atsushi Sakaguchi & Shunya Konno & Fumiya Hanamura & Warit Asavanant & Kan Takase & Hisashi Ogawa & Petr Marek & Radim Filip & Jun-ichi Yoshikawa & Elanor Huntington & Hidehiro Yonezawa & Akira Furusa, 2023. "Nonlinear feedforward enabling quantum computation," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    7. Slaoui, Abdallah & Salah, Ahmed & Daoud, Mohammed, 2020. "Influence of Stark-shift on quantum coherence and non-classical correlations for two two-level atoms interacting with a single-mode cavity field," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 558(C).
    8. Abdel-Khalek, S. & Berrada, K. & Aldaghfag, Shatha A., 2021. "Quantum correlations and non-classical properties for two superconducting qubits interacting with a quantized field in the context of deformed Heisenberg algebra," Chaos, Solitons & Fractals, Elsevier, vol. 143(C).
    9. Eric Hyyppä & Suman Kundu & Chun Fai Chan & András Gunyhó & Juho Hotari & David Janzso & Kristinn Juliusson & Olavi Kiuru & Janne Kotilahti & Alessandro Landra & Wei Liu & Fabian Marxer & Akseli Mäkin, 2022. "Unimon qubit," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    10. Shuai-Peng Wang & Alessandro Ridolfo & Tiefu Li & Salvatore Savasta & Franco Nori & Y. Nakamura & J. Q. You, 2023. "Probing the symmetry breaking of a light–matter system by an ancillary qubit," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    11. Berrada, K. & Sabik, A. & Khalil, E.M. & Abdel-Khalek, S., 2024. "Geometric phase and Wehrl phase entropy for two superconducting qubits in a coherent field system under the effect of nonlinear medium," Chaos, Solitons & Fractals, Elsevier, vol. 178(C).

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