Superconducting Quantum Circuits Research Group

Theme/Field

We aim to realize novel quantum systems from Josephson junction based superconducting circuits that are founded on new physical principles and fabricated using cutting edge technologies. The aim of this work is to both study and harness the opportunities arising from quantum phenomena for new fundamental science and applications that cannot be satisfied by existing technologies.

Message

Dr. Shiro Saito
Group Leader
Dr. Shiro Saito

Superconducting quantum circuits integrated with Josephson junctions are at the forefront of quantum technologies that could form the backbone of a universal quantum computer. The unprecedented control over the fragile quantum states that is offered by these circuits can also be exploited for a range of quantum-enabled applications that have emerged as spin-offs from quantum computing. Our research group aims to exploit superconducting quantum circuits either independently or by coupling them to electromagnetic resonators in 3D cavities or spin ensembles in crystals and even organic biological agents to build long lived qubits and to perform ultimate measurements with quantum sensors whose performance exceeds classical bounds. In parallel superconducting circuits will also be used to study microwave quantum optics and quantum simulation where this work is underpinned by an in-house theoretical program.

Member

Dr. Imran Mahboob

Dr. Imran Mahboob

Dr. Kousuke Kakuyanagi

Dr. Kousuke Kakuyanagi

Dr. Toida Hiraku

Dr. Toida Hiraku

Dr. Takaaki Takenaka

Dr. Takaaki Takenaka

Dr. Leonid Abdurakhimov

Dr. Leonid Abdurakhimov

Dr. Kosuke Mizuno

Dr. Kosuke Mizuno

Topics by Group

Press Release

Publications

Publications in 2020

  1. L. V. Abdurakhimov, I. Mahboob, H. Toida, K. Kakuyanagi, Y. Matsuzaki, and S. Saito

    Driven-state relaxation of a coupled qubit-defect system in spin-locking measurements

    Phys. Rev. B 102 (10), 100502 (2020).

  2. H. Toida, T. Ohrai, Y. Matsuzaki, K. Kakuyanagi, and S. Saito

    Control of the transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator

    Phys. Rev. B 102 (9), 094502 (2020).

  3. R. P. Budoyo, K. Kakuyanagi, H. Toida, Y. Matsuzaki, and S. Saito

    Electron spin resonance with up to 20 spin sensitivity measured using a superconducting flux qubit

    Appl. Phys. Lett. 116 (19), 194001 (2020).

  4. Y. Matsuzaki, V. M. Bastidas, Y. Takeuchi, W. J. Munro, and S. Saito

    One-way Transfer of Quantum States via Decoherence

    J. Phys. Soc. Jpn. 89 (4), 044003 (2020).

  5. K. Miyanishi, Y. Matsuzaki, H. Toida, K. Kakuyanagi, M. Negoro, M. Kitagawa, and S. Saito

    Architecture to achieve nuclear magnetic resonance spectroscopy with a superconducting flux qubit

    Phys. Rev. A 101 (5), 052303 (2020).

  6. S. Endo, Y. Matsuzaki, K. Kakuyanagi, S. Saito, N. Lambert, and F. Nori

    Projecting an ultra-strongly-coupled system in a non-energy-eigenbasis with a driven nonlinear resonator

    Sci Rep 10 (1), 1751 (2020).

  1. L. V. Abdurakhimov, I. Mahboob, H. Toida, K. Kakuyanagi, and S. Saito

    A long-lived capacitively shunted flux qubit embedded in a 3D cavity

    ppl. Phys. Lett. 115 (26), 262601 (2019).

  2. T. Yamaguchi, Y. Matsuzaki, S. Saito, S. Saijo, H. Watanabe, N. Mizuochi, and J. Ishi-Hayase

    Bandwidth analysis of AC magnetic field sensing based on electronic spin double-resonance of nitrogen-vacancy centers in diamond

    Jpn. J. Appl. Phys. 58 (10), 100901 (2019).

  3. M. Tatsuta, Y. Matsuzaki, and A. Shimizu

    Quantum metrology with generalized cat states

    Phys. Rev. A 100 (3), 032318 (2019).

  4. L. B. Ho, Y. Matsuzaki, M. Matsuzaki, and Y. Kondo

    Realization of controllable open system with NMR

    New J. Phys. 21, 093008 (2019).

  5. S. Ashhab, Y. Matsuzaki, K. Kakuyanagi, S. Saito, F. Yoshihara, T. Fuse, and K. Semba

    Spectrum of the Dicke model in a superconducting qubit-oscillator system

    Phys. Rev. A 99 (6), 063822 (2019).

  6. L. V. Abdurakhimov, S. Khan, N. A. Panjwani, D. Breeze, M. Mochizuki, S. Seki, Y. Tokura, J. J. Morton, and H. Kurebayashi

    Magnon-photon coupling in the noncollinear magnetic insulator Cu2OSeO3

    Phys. Rev. B 99 (14), 140401 (2019).

  7. H. Toida, Y. Matsuzaki, K. Kakuyanagi, X. B. Zhu, W. J. Munro, H. Yamaguchi, and S. Saito

    Electron paramagnetic resonance spectroscopy using a single artificial atom

    Commun. Phys. 2, 33 (2019).

  8. Y. Takeuchi, Y. Matsuzaki, K. Miyanishi, T. Sugiyama, and W. J. Munro

    Quantum remote sensing with asymmetric information gain

    Phys. Rev. A 99 (2), 022325 (2019).

  9. P. Renault, H. Yamaguchi, and I. Mahboob

    Virtual Exceptional Points in an Electromechanical System

    Phys. Rev. Appl. 11 (2), 024007 (2019).

  10. K. Yahata, Y. Matsuzaki, S. Saito, H. Watanabe, and J. Ishi-Hayase

    Demonstration of vector magnetic field sensing by simultaneous control of nitrogen-vacancy centers in diamond using multi-frequency microwave pulses

    Appl. Phys. Lett. 114 (2), 022404 (2019).

  1. Y. Matsuzaki, S. Benjamin, S. Nakayama, S. Saito, and W. J. Munro

    Quantum Metrology beyond the Classical Limit under the Effect of Dephasing

    Phys. Rev. Lett. 120 (14), 140501 (2018).

  2. R. P. Budoyo, K. Kakuyanagi, H. Toida, Y. Matsuzaki, W. J. Munro, H. Yamaguchi, and S. Saito

    Phonon-bottlenecked spin relaxation of Er3+:Y2SiO5 at sub-kelvin temperatures

    Appl. Phys. Express 11 (4), 043002 (2018).

  3. K. Hayashi, Y. Matsuzaki, T. Taniguchi, T. Shimo-Oka, I. Nakamura, S. Onoda, T. Ohshima, H. Morishita, M. Fujiwara, S. Saito, and N. Mizuochi

    Optimization of Temperature Sensitivity Using the Optically Detected Magnetic-Resonance Spectrum of a Nitrogen-Vacancy Center Ensemble

    Phys. Rev. Appl. 10 (3), 034009 (2018).

  4. S. Saijo, Y. Matsuzaki, S. Saito, T. Yamaguchi, I. Hanano, H. Watanabe, N. Mizuochi, and J. Ishi-Hayase

    AC magnetic field sensing using continuous-wave optically detected magnetic resonance of nitrogen-vacancy centers in diamond

    Appl. Phys. Lett. 113 (8), 082405 (2018).

  5. F. Yoshihara, T. Fuse, Z. Ao, S. Ashhab, K. Kakuyanagi, S. Saito, T. Aoki, K. Koshino, and K. Semba

    Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime

    Phys. Rev. Lett. 120 (18), 183601 (2018).

  6. Y. Matsuzaki, S. Benjamin, S. Nakayama, S. Saito, and W. J. Munro

    Quantum Metrology beyond the Classical Limit under the Effect of Dephasing

    Phys. Rev. Lett. 120 (14), 140501 (2018).

  7. R. P. Budoyo, K. Kakuyanagi, H. Toida, Y. Matsuzaki, W. J. Munro, H. Yamaguchi, and S. Saito

    Phonon-bottlenecked spin relaxation of Er3+:Y2SiO5 at sub-kelvin temperatures

    Appl. Phys. Express 11 (4), 043002 (2018).

  8. R. P. Budoyo, K. Kakuyanagi, H. Toida, Y. Matsuzaki, W. J. Munro, H. Yamaguchi, and S. Saito

    Electron paramagnetic resonance spectroscopy of Er3+:Y2SiO5 using a Josephson bifurcation amplifier: Observation of hyperfine and quadrupole structures

    Phys. Rev. Mater. 2 (1), 011403 (2018).

  1. S. Kitazawa, Y. Matsuzaki, S. Saijo, K. Kakuyanagi, S. Saito, and J. Ishi-Hayase

    Vector-magnetic-field sensing via multifrequency control of nitrogen-vacancy centers in diamond

    Phys. Rev. A 96 (4), 042115 (2017).

  2. A. Iwakura, Y. Matsuzaki, and Y. Kondo

    Engineered noisy environment for studying decoherence

    Phys. Rev. A 96 (3), 032303 (2017).

  3. Y. Matsuzaki, S. Nakayama, A. Soeda, S. Saito, and M. Murao

    Projective measurement of energy on an ensemble of qubits with unknown frequencies

    Phys. Rev. A 95 (6), 062106 (2017).

  4. F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, and K. Semba

    Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime

    Phys. Rev. A 95 (5), 053824 (2017).

  5. F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, and K. Semba

    Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime

    Phys. Rev. A 95 (5), 053824 (2017).

  6. Y. Matsuzaki, and S. Benjamin

    Magnetic-field sensing with quantum error detection under the effect of energy relaxation

    Phys. Rev. A 95 (3), 032303 (2017).

  7. F. Yoshihara, T. Fuse, S. Ashhab, K. Kakuyanagi, S. Saito, and K. Semba

    Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime

    Nat. Phys. 13 (1) 44-47 (2017).

  1. Y. Matsuzaki, T. Shimo-Oka, H. Tanaka, Y. Tokura, K. Semba and N. Mizuochi

    Hybrid quantum magnetic-field sensor with an electron spin and a nuclear spin in diamond

    Phys. Rev. A 94 (5), 052330 (2016)

  2. K. Kakuyanagi, Y. Matsuzaki, C. Deprez, H. Toida, K. Semba, H. Yamaguchi, W. J. Munro and S. Saito

    Observation of Collective Coupling between an Engineered Ensemble of Macroscopic Artificial Atoms and a Superconducting Resonator

    Phys. Rev. Lett. 117 (21), 210503 (2016)

  3. K. Kakuyanagi, Y. Matsuzaki, T. Baba, H. Nakano, S. Saito and K. Semba

    Characterization and Control of Measurement-Induced Dephasing on Superconducting Flux Qubit with a Josephson Bifurcation Amplifier

    J. Phys. Soc. Jpn. 85 (10), 104801 (2016)

  4. Y. Matsuzaki, H. Morishita, T. Shimooka, T. Tashima, K. Kakuyanagi, K. Semba, W. J. Munro, H. Yamaguchi, N. Mizuochi and S. Saito

    Optically detected magnetic resonance of high-density ensemble of NV- centers in diamond

    J. Phys.-Condes. Matter 28 (27), 275302 (2016)

  5. S. Dooley, E. Yukawa, Y. Matsuzaki, G. C. Knee, W. J. Munro and K. Nemoto

    A hybrid-systems approach to spin squeezing using a highly dissipative ancillary system

    New J. Phys. 18 (2016)

  6. H. Toida, Y. Matsuzaki, K. Kakuyanagi, X. B. Zhu, W. J. Munro, K. Nemoto, H. Yamaguchi and S. Saito

    Electron paramagnetic resonance spectroscopy using a direct current-SQUID magnetometer directly coupled to an electron spin ensemble

    Appl. Phys. Lett. 108 (5), 052601 (2016)

  7. Y. Matsuzaki and H. Tanaka

    Quantum Zeno Effect in an Unstable System with NMR

    J. Phys. Soc. Jpn. 85 (1), 014001 (2016)

  8. Y. Kondo, Y. Matsuzaki, K. Matsushima and J. G. Filgueiras

    Using the quantum Zeno effect for suppression of decoherence

    New J. Phys. 18 013033 (2016)

  9. G. C. Knee, K. Kakuyanagi, M. C. Yeh, Y. Matsuzaki, H. Toida, H. Yamaguchi, S. Saito, A. J. Leggett, and W. J. Munro

    A strict experimental test of macroscopic realism in a superconducting flux qubit

    Nat. Commun. 7, 13253 (2016).

  10. N. Lambert, Y. Matsuzaki, K. Kakuyanagi, N. Ishida, S. Saito, and F. Nori

    Superradiance with an ensemble of superconducting flux qubits

    Phys. Rev. B 94 (22), 224510 (2016)

  1. T. Tanaka, P. Knott, Y. Matsuzaki, S. Dooley, H. Yamaguchi, W. J. Munro and S. Saito

    Proposed Robust Entanglement-Based Magnetic Field Sensor Beyond the Standard Quantum Limit

    Phys. Rev. Lett. 115, 170801 (2015)

  2. S. Endo, Y. Matsuzaki, W. J. Munro, T. Koike and S. Saito

    Spin Amplification in an Inhomogeneous System

    J. Phys. Soc. Jpn. 84, 103001 (2015)

  3. J. Govenius, Y. Matsuzaki, I. G. Savenko and M. Mottonen

    Parity measurement of remote qubits using dispersive coupling and photodetection

    Phys. Rev. A 92, 042305 (2015)

  4. H. Cai, Y. Matsuzaki, K. Kakuyanagi, H. Toida, X. Zhu, N. Mizuochi, K. Nemoto, K. Semba, W. J. Munro, S. Saito and H. Yamaguchi

    Analysis of the spectroscopy of a hybrid system composed of a superconducting flux qubit and diamond NV- centers

    J. Phys.-Condes. Matter 27, 345702 (2015)

  5. K. Kakuyanagi, T. Baba, Y. Matsuzaki, H. Nakano, S. Saito and K. Semba

    Observation of quantum Zeno effect in a superconducting flux qubit

    New J. Phys. 17, 063035 (2015)

  6. T. Satoh, Y. Matsuzaki, K. Kakuyanagi, W. J. Munro, K. Semba, H. Yamaguchi and S. Saito

    Scalable quantum computation architecture using always-on Ising interactions via quantum feedforward

    Phys. Rev. A 91, 052329 (2015)

  7. Y. Matsuzaki, X. Zhu, K. Kakuyanagi, H. Toida, T. Shimooka, N. Mizuochi, K. Nemoto, K. Semba, W. J. Munro, H. Yamaguchi and S. Saito

    Improving the lifetime of the nitrogen-vacancy-center ensemble coupled with a superconducting flux qubit by applying magnetic fields

    Phys. Rev. A 91, 042329 (2015)

  8. Y. Matsuzaki, X. Zhu, K. Kakuyanagi, H. Toida, T. Shimo-Oka, N. Mizuochi, K. Nemoto, K. Semba, W. J. Munro, H. Yamaguchi, and S. Saito

    Improving the Coherence Time of a Quantum System via a Coupling to a Short-Lived System

    Phys. Rev. Lett. 114, 120501 (2015)

  1. X. B. Zhu, Y. Matsuzaki, R. Amsuss, K. Kakuyanagi, T. Shimo-Oka, N. Mizuochi, K. Nemoto, K. Semba, W. J. Munro and S. Saito

    Observation of dark states in a superconductor diamond quantum hybrid system

    Nat. Commun. 5, 3524 (2014)

  1. K. Kakuyanagi, S. Kagei, R. Koibuchi, S. Saito, A. Lupascu, K. Semba, and H. Nakano

    Experimental analysis of the measurement strength dependence of superconducting qubit readout using a Josephson bifurcation readout method

    New J. Phys. 15, 043028 (2013)

  2. S. Saito, XB. Zhu, R. Amsuess, Y. Matsuzaki, K. Kakuyanagi, T. Shimo-Oka, N. Mizuochi, K. Nemoto, WJ. Munro, and K. Semba

    Towards Realizing a Quantum Memory for a Superconducting Qubit: Storage and Retrieval of Quantum States

    Phys. Rev. Lett. 111 (10), 107008 (2013)

  3. A. Shimizu, Y. Matsuzaki, and A. Ukena

    Necessity of Superposition of Macroscopically Distinct States for Quantum Computational Speedup

    J. Phys. Soc. Jpn. 82 (5), 054801 (2013)

  1. K. Koshino, and Y. Matsuzaki.

    Entangling homogeneously broadened matter qubits in the weak-coupling cavity-QED regime

    Physical Review A 86 (2), 020305 (2012)

  2. Y. Matsuzaki, and H. Nakano

    Enhanced energy relaxation process of a quantum memory coupled to a superconducting qubit

    Physical Review B 86 (18), 184501 (2012)

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