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Your search keyword '"Kanazawa, Naoki"' showing total 11 results
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11 results on '"Kanazawa, Naoki"'

1. Detection of temporal fluctuation in superconducting qubits for quantum error mitigation

Author

Hirasaki, Yuta, Daimon, Shunsuke, Itoko, Toshinari, Kanazawa, Naoki, and Saitoh, Eiji

Subjects
Quantum Physics
Abstract

We have investigated instability of a superconducting quantum computer by continuously monitoring the qubit output. We found that qubits exhibit a step-like change in the error rates. This change is repeatedly observed, and each step persists for several minutes. By analyzing the correlation between the increased errors and anomalous variance of the output, we demonstrate quantum error mitigation based on post-selection. Numerical analysis on the proposed method was also conducted., Comment: 5 pages, 4 figures

Published
2023
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2. Dynamics of measurement-induced state transitions in superconducting qubits.

Author

Hirasaki, Yuta, Daimon, Shunsuke, Kanazawa, Naoki, Itoko, Toshinari, Tokunari, Masao, and Saitoh, Eiji

Subjects
SUPERCONDUCTING transitions, QUANTUM measurement, QUBITS, TIME-resolved measurements, ERROR rates
Abstract

We have investigated temporal fluctuation of superconducting qubits via the time-resolved measurement for an IBM Quantum system. We found that the qubit error rate abruptly changes during specific time intervals. Each high error state persists for several tens of seconds and exhibits an on-off behavior. The observed temporal instability can be attributed to qubit transitions induced by a measurement stimulus. Resonant transition between fluctuating dressed states of the qubits coupled with high-frequency resonators can be responsible for the error-rate change. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Demonstration of quantum volume 64 on a superconducting quantum computing system.

Author

Jurcevic, Petar, Javadi-Abhari, Ali, Bishop, Lev S, Lauer, Isaac, Bogorin, Daniela F, Brink, Markus, Capelluto, Lauren, Günlük, Oktay, Itoko, Toshinari, Kanazawa, Naoki, Kandala, Abhinav, Keefe, George A, Krsulich, Kevin, Landers, William, Lewandowski, Eric P, McClure, Douglas T, Nannicini, Giacomo, Narasgond, Adinath, Nayfeh, Hasan M, and Pritchett, Emily

Published
2021
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10. Monolithic Structure and Multiaxis Magnetic Sensing with Magnonic Crystals.

Author

Takagi, Hiroyuki, Noda, Josho, Ueno, Tomomi, Kanazawa, Naoki, Nakamura, Yuichi, and Inoue, Mitsuteru

Subjects
MONOLITHIC reactors, MAGNETIC sensors, THIN films, BAND gaps, MAGNETIC fields, SPIN waves
Abstract

SUMMARY We aim at the development of high-sensitivity magnetic sensors with magnonic crystals at room temperature. We fabricated SmCo thin film magnets on magnonic crystals as a monolithic structure. We were able to excite spin waves and develop a magnonic band gap by means of the magnetic field of the thin film magnet. Since magnonic crystals have a high magnetic field dependence, there is potential for their use as magnetic sensors. The maximum response sensitivity of the magnonic crystals with SmCo thin film magnets was found to be 7900%/Oe. We also investigated two-axis magnetic field sensing by spin waves. [ABSTRACT FROM AUTHOR]

Published
2014
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