The Experts below are selected from a list of 1995 Experts worldwide ranked by ideXlab platform
R Mcdermott - One of the best experts on this subject based on the ideXlab platform.
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high fidelity readout of a transmon qubit using a superconducting low inductance undulatory Galvanometer microwave amplifier
New Journal of Physics, 2014Co-Authors: Yanbing Liu, David Hover, Shaojiang Zhu, R Mcdermott, Srikanth Srinivasan, Andrew HouckAbstract:We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory Galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by in a window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of with a measurement time of . Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of .
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high fidelity qubit readout with the superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2014Co-Authors: David Hover, Guilhem Ribeill, Shaojiang Zhu, Ted Thorbeck, D Sank, J Kelly, R Barends, John M Martinis, R McdermottAbstract:We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
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superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2012Co-Authors: David Hover, Yungfu Chen, Guilhem Ribeill, Shaojiang Zhu, S Sendelbach, R McdermottAbstract:We describe a microwave amplifier based on the superconducting low-inductance undulatory Galvanometer (SLUG). The SLUG is embedded in a microstrip resonator, and the signal current is injected directly into the device loop. Measurements at 30 mK show gains of 25 dB at 3 GHz and 15 dB at 9 GHz. Amplifier performance is well described by a simple numerical model based on the Josephson junction phase dynamics. We expect optimized devices based on high critical current junctions to achieve gain greater than 15 dB, bandwidth of several hundred MHz, and added noise of order one quantum in the frequency range of 5-10 GHz.
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superconducting low inductance undulatory Galvanometer microwave amplifier theory
Journal of Applied Physics, 2011Co-Authors: Guilhem Ribeill, David Hover, Yungfu Chen, Shaojiang Zhu, R McdermottAbstract:We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory Galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.
David Hover - One of the best experts on this subject based on the ideXlab platform.
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high fidelity readout of a transmon qubit using a superconducting low inductance undulatory Galvanometer microwave amplifier
New Journal of Physics, 2014Co-Authors: Yanbing Liu, David Hover, Shaojiang Zhu, R Mcdermott, Srikanth Srinivasan, Andrew HouckAbstract:We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory Galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by in a window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of with a measurement time of . Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of .
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high fidelity qubit readout with the superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2014Co-Authors: David Hover, Guilhem Ribeill, Shaojiang Zhu, Ted Thorbeck, D Sank, J Kelly, R Barends, John M Martinis, R McdermottAbstract:We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
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superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2012Co-Authors: David Hover, Yungfu Chen, Guilhem Ribeill, Shaojiang Zhu, S Sendelbach, R McdermottAbstract:We describe a microwave amplifier based on the superconducting low-inductance undulatory Galvanometer (SLUG). The SLUG is embedded in a microstrip resonator, and the signal current is injected directly into the device loop. Measurements at 30 mK show gains of 25 dB at 3 GHz and 15 dB at 9 GHz. Amplifier performance is well described by a simple numerical model based on the Josephson junction phase dynamics. We expect optimized devices based on high critical current junctions to achieve gain greater than 15 dB, bandwidth of several hundred MHz, and added noise of order one quantum in the frequency range of 5-10 GHz.
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superconducting low inductance undulatory Galvanometer microwave amplifier theory
Journal of Applied Physics, 2011Co-Authors: Guilhem Ribeill, David Hover, Yungfu Chen, Shaojiang Zhu, R McdermottAbstract:We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory Galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.
Shaojiang Zhu - One of the best experts on this subject based on the ideXlab platform.
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high fidelity readout of a transmon qubit using a superconducting low inductance undulatory Galvanometer microwave amplifier
New Journal of Physics, 2014Co-Authors: Yanbing Liu, David Hover, Shaojiang Zhu, R Mcdermott, Srikanth Srinivasan, Andrew HouckAbstract:We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory Galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by in a window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of with a measurement time of . Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of .
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high fidelity qubit readout with the superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2014Co-Authors: David Hover, Guilhem Ribeill, Shaojiang Zhu, Ted Thorbeck, D Sank, J Kelly, R Barends, John M Martinis, R McdermottAbstract:We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
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superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2012Co-Authors: David Hover, Yungfu Chen, Guilhem Ribeill, Shaojiang Zhu, S Sendelbach, R McdermottAbstract:We describe a microwave amplifier based on the superconducting low-inductance undulatory Galvanometer (SLUG). The SLUG is embedded in a microstrip resonator, and the signal current is injected directly into the device loop. Measurements at 30 mK show gains of 25 dB at 3 GHz and 15 dB at 9 GHz. Amplifier performance is well described by a simple numerical model based on the Josephson junction phase dynamics. We expect optimized devices based on high critical current junctions to achieve gain greater than 15 dB, bandwidth of several hundred MHz, and added noise of order one quantum in the frequency range of 5-10 GHz.
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superconducting low inductance undulatory Galvanometer microwave amplifier theory
Journal of Applied Physics, 2011Co-Authors: Guilhem Ribeill, David Hover, Yungfu Chen, Shaojiang Zhu, R McdermottAbstract:We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory Galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.
Masatoshi Ishikawa - One of the best experts on this subject based on the ideXlab platform.
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extension of the capture range under high speed motion using Galvanometer mirror
International Conference on Advanced Intelligent Mechatronics, 2020Co-Authors: Yuriko Ezaki, Tomohiko Hayakawa, Yushi Moko, Haruka Ikeda, Masatoshi IshikawaAbstract:Inspection of tunnel surfaces on highway is an important task in ensuring transportation safety and stability. Although an existing method used for scanning tunnel surfaces while traveling on the highway is efficient and can prevent traffic violations, its scanning range in every traveling was limited. Thus, we propose a method to extend the range of scanning per trial using a Galvanometer mirror. The Galvanometer mirror is used for changing the angle of scanning degree and capturing at an angle equivalent to twice the angle of camera’s view, which contributes to improve the efficiency of tunnel inspections. The mirror must move fast enough to change the angle within one shot. However, resonance noise of the Galvanometer mirror is generated owing to its physical rigidity. Therefore, we propose an additional noise suppression method to adjust the widths of the input pulse.
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high speed motion blur compensation system in infrared region using Galvanometer mirror and thermography camera
Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2020, 2020Co-Authors: Y Kubota, Tomohiko Hayakawa, Yushi Moko, Masatoshi IshikawaAbstract:The infrared thermography method has been used as a non-contact and quick diagnostic technique for the measurement of deformation inside concrete structures. Measurement from the in-vehicle camera is indispensable for quick diagnosis, yet motion blur while running is the essential problem. In this study, we developed a system using the Galvanometer mirror and the thermography camera for compensating this motion blur. In the indoor and outdoor experiment assuming the measurement at 40 km/h, it was confirmed that our system compensated the motion blur effectively in the infrared region and detected the delamination of concrete structures.
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real time high speed motion blur compensation method using Galvanometer mirror for shape sensing of microfabricated objects
Optics Photonics and Digital Technologies for Imaging Applications V, 2018Co-Authors: Kenichi Murakami, Tomohiko Hayakawa, Jerome De Leon, Masatoshi IshikawaAbstract:In this paper, motion-blur compensation method for micro fabricated objects using a Galvanometer mirror with back-and-forth rotation is proposed. Motion-blur compensation is expected to extend exposure time without motion blur because longer exposure time can decrease the intensity of illumination to avoid shape expansion of a target object by heat of illumination. Dealing with this demand, a Galvanometer mirror is installed between the target and a 2D high-speed camera, and controls the optical axis of the camera to follow the moving target. Each continuous images are taken during the motion of the stage, and finally taken images are integrated into one image by patching for detecting fabrication error using image processing. The experimental system that consists of a high-speed camera, a Galvanometer mirror and a high-precision stage is developed and a 20mm=/s moving drilled silicon nitride sheet having holes of about 40 μm in diameter are lattice-shaped at a pitch of 60 μm is captured without motion blur by using this system. Comparing captured images with still images in diameter, roundness and curvature of the each holes, the effectiveness of this system is validated.
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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques.
Journal of visualized experiments : JoVE, 2017Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Taku Senoo, Masatoshi IshikawaAbstract:Galvanometer mirrors are used for optical applications such as target tracking, drawing, and scanning control because of their high speed and accuracy. However, the responsiveness of a Galvanometer mirror is limited by its inertia; hence, the gain of a Galvanometer mirror is reduced when the control path is steep. In this research, we propose a method to extend the corresponding frequency using a pre-emphasis technique to compensate for the gain reduction of Galvanometer mirrors in sine-wave path tracking using proportional-integral-differential (PID) control. The pre-emphasis technique obtains an input value for a desired output value in advance. Applying this method to control the Galvanometer mirror, the raw gain of a Galvanometer mirror in each frequency and amplitude for sine-wave path tracking using a PID controller was calculated. Where PID control is not effective, maintaining a gain of 0 dB to improve the trajectory tracking accuracy, it is possible to expand the speed range in which a gain of 0 dB can be obtained without tuning the PID control parameters. However, if there is only one frequency, amplification is possible with a single pre-emphasis coefficient. Therefore, a sine wave is suitable for this technique, unlike triangular and sawtooth waves. Hence, we can adopt a pre-emphasis technique to configure the parameters in advance, and we need not prepare additional active control models and hardware. The parameters are updated immediately within the next cycle because of the open loop after the pre-emphasis coefficients are set. In other words, to regard the controller as a black box, we need to know only the input-to-output ratio, and detailed modeling is not required. This simplicity allows our system to be easily embedded in applications. Our method using the pre-emphasis technique for a motion-blur compensation system and the experiment conducted to evaluate the method are explained.
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simultaneous position and angle control for outgoing laser beam design using two Galvanometer mirrors
Proceedings of SPIE, 2017Co-Authors: Tomohiko Hayakawa, Masatoshi IshikawaAbstract:In this study, we propose a laser beam pointing method that allows for simultaneous control of position and angle using two commercially available Galvanometer mirrors. Two mirrors are placed next to each other. Mathematical calculations show that the outgoing beam angle for the system is defined by the control angles of the two mirrors, and the one-dimensional position of the outgoing beam is defined by the angles of the two mirrors and the distance between their rotational centers. Using a line laser, two Galvanometer mirrors, and a camera, we confirmed that the one-dimensional position and angle can be controlled using the proposed method. This method can be used for dynamic fabrication and manufacturing in future.
Guilhem Ribeill - One of the best experts on this subject based on the ideXlab platform.
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high fidelity qubit readout with the superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2014Co-Authors: David Hover, Guilhem Ribeill, Shaojiang Zhu, Ted Thorbeck, D Sank, J Kelly, R Barends, John M Martinis, R McdermottAbstract:We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
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superconducting low inductance undulatory Galvanometer microwave amplifier
Applied Physics Letters, 2012Co-Authors: David Hover, Yungfu Chen, Guilhem Ribeill, Shaojiang Zhu, S Sendelbach, R McdermottAbstract:We describe a microwave amplifier based on the superconducting low-inductance undulatory Galvanometer (SLUG). The SLUG is embedded in a microstrip resonator, and the signal current is injected directly into the device loop. Measurements at 30 mK show gains of 25 dB at 3 GHz and 15 dB at 9 GHz. Amplifier performance is well described by a simple numerical model based on the Josephson junction phase dynamics. We expect optimized devices based on high critical current junctions to achieve gain greater than 15 dB, bandwidth of several hundred MHz, and added noise of order one quantum in the frequency range of 5-10 GHz.
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superconducting low inductance undulatory Galvanometer microwave amplifier theory
Journal of Applied Physics, 2011Co-Authors: Guilhem Ribeill, David Hover, Yungfu Chen, Shaojiang Zhu, R McdermottAbstract:We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory Galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.
