6 results on '"Jack Y. Qiu"'
Search Results
2. Two-Qubit Spectroscopy of Spatiotemporally Correlated Quantum Noise in Superconducting Qubits
- Author
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Uwe von Lüpke, Félix Beaudoin, Leigh M. Norris, Youngkyu Sung, Roni Winik, Jack Y. Qiu, Morten Kjaergaard, David Kim, Jonilyn Yoder, Simon Gustavsson, Lorenza Viola, and William D. Oliver
- Subjects
Physics ,QC1-999 ,Computer software ,QA76.75-76.765 - Abstract
Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced metrology. However, a complete spectral characterization of the noise environment of even a two-qubit system has not been reported thus far. We propose and experimentally demonstrate a protocol for two-qubit dephasing noise spectroscopy based on continuous-control modulation. By combining ideas from spin-locking relaxometry with a statistically motivated robust estimation approach, our protocol allows for the simultaneous reconstruction of all the single-qubit and two-qubit cross-correlation spectra, including access to their distinctive nonclassical features. Only single-qubit control manipulations and state-tomography measurements are employed, with no need for entangled-state preparation or readout of two-qubit observables. While our experimental demonstration uses two superconducting qubits coupled to a shared, colored engineered noise source, our methodology is portable to a variety of dephasing-dominated qubit architectures. By pushing quantum noise spectroscopy beyond the single-qubit setting, our work heralds the characterization of spatiotemporal correlations in both engineered and naturally occurring noise environments.
- Published
- 2020
- Full Text
- View/download PDF
3. Deep-Neural-Network Discrimination of Multiplexed Superconducting-Qubit States
- Author
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Benjamin Lienhard, Antti Vepsäläinen, Luke C.G. Govia, Cole R. Hoffer, Jack Y. Qiu, Diego Ristè, Matthew Ware, David Kim, Roni Winik, Alexander Melville, Bethany Niedzielski, Jonilyn Yoder, Guilhem J. Ribeill, Thomas A. Ohki, Hari K. Krovi, Terry P. Orlando, Simon Gustavsson, and William D. Oliver
- Subjects
General Physics and Astronomy - Published
- 2022
4. Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
- Author
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Jack Y. Qiu, Arne Grimsmo, Kaidong Peng, Bharath Kannan, Benjamin Lienhard, Youngkyu Sung, Philip Krantz, Vladimir Bolkhovsky, Greg Calusine, David Kim, Alex Melville, Bethany M. Niedzielski, Jonilyn Yoder, Mollie E. Schwartz, Terry P. Orlando, Irfan Siddiqi, Simon Gustavsson, Kevin P. O’Brien, and William D. Oliver
- Subjects
Quantum Physics ,General Physics and Astronomy ,FOS: Physical sciences ,Quantum Physics (quant-ph) - Abstract
Squeezing of the electromagnetic vacuum is an essential metrological technique used to reduce quantum noise in applications spanning gravitational wave detection, biological microscopy, and quantum information science. In superconducting circuits, the resonator-based Josephson-junction parametric amplifiers conventionally used to generate squeezed microwaves are constrained by a narrow bandwidth and low dynamic range. In this work, we develop a dual-pump, broadband Josephson traveling-wave parametric amplifier that combines a phase-sensitive extinction ratio of 56 dB with single-mode squeezing on par with the best resonator-based squeezers. We also demonstrate two-mode squeezing at microwave frequencies with bandwidth in the gigahertz range that is almost two orders of magnitude wider than that of contemporary resonator-based squeezers. Our amplifier is capable of simultaneously creating entangled microwave photon pairs with large frequency separation, with potential applications including high-fidelity qubit readout, quantum illumination and teleportation.
- Published
- 2022
- Full Text
- View/download PDF
5. Non-Gaussian noise spectroscopy with a superconducting qubit sensor
- Author
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Lorenza Viola, Uwe von Lüpke, Jack Y. Qiu, Félix Beaudoin, William D. Oliver, Simon Gustavsson, Youngkyu Sung, Leigh Norris, Terry P. Orlando, Fei Yan, Jonilyn Yoder, and David Kim
- Subjects
Quantum decoherence ,Quantum information ,Science ,Dephasing ,Gaussian ,FOS: Physical sciences ,General Physics and Astronomy ,02 engineering and technology ,Quantum metrology ,01 natural sciences ,Quantum mechanics ,General Biochemistry, Genetics and Molecular Biology ,Article ,symbols.namesake ,0103 physical sciences ,Quantum system ,Statistical physics ,010306 general physics ,Quantum information science ,lcsh:Science ,Physics ,Quantum Physics ,Multidisciplinary ,Spectral density estimation ,General Chemistry ,021001 nanoscience & nanotechnology ,Gaussian noise ,Qubit ,symbols ,lcsh:Q ,Quantum Physics (quant-ph) ,0210 nano-technology ,Qubits - Abstract
Accurate characterization of the noise influencing a quantum system of interest has far-reaching implications across quantum science, ranging from microscopic modeling of decoherence dynamics to noise-optimized quantum control. While the assumption that noise obeys Gaussian statistics is commonly employed, noise is generically non-Gaussian in nature. In particular, the Gaussian approximation breaks down whenever a qubit is strongly coupled to discrete noise sources or has a non-linear response to the environmental degrees of freedom. Thus, in order to both scrutinize the applicability of the Gaussian assumption and capture distinctive non-Gaussian signatures, a tool for characterizing non-Gaussian noise is essential. Here, we experimentally validate a quantum control protocol which, in addition to the spectrum, reconstructs the leading higher-order spectrum of engineered non-Gaussian dephasing noise using a superconducting qubit as a sensor. This first experimental demonstration of non-Gaussian noise spectroscopy represents a major step toward demonstrating a complete spectral estimation toolbox for quantum devices., 21 pages, 12 figures
- Published
- 2019
6. Two-Qubit Spectroscopy of Spatiotemporally Correlated Quantum Noise in Superconducting Qubits
- Author
-
Youngkyu Sung, Jack Y. Qiu, Leigh Norris, David Kim, Lorenza Viola, Uwe von Lüpke, Morten Kjaergaard, William D. Oliver, Simon Gustavsson, Félix Beaudoin, Jonilyn Yoder, and Roni Winik
- Subjects
Superconductivity ,Physics ,Quantum Physics ,Quantum noise ,Spectrum (functional analysis) ,General Engineering ,FOS: Physical sciences ,01 natural sciences ,010305 fluids & plasmas ,Computer Science::Emerging Technologies ,Qubit ,Quantum mechanics ,0103 physical sciences ,General Earth and Planetary Sciences ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,Quantum Physics (quant-ph) ,010306 general physics ,Spectroscopy ,General Environmental Science - Abstract
Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced metrology. However, a complete spectral characterization of the noise environment of even a two-qubit system has not been reported thus far. We propose and experimentally demonstrate a protocol for two-qubit dephasing noise spectroscopy based on continuous-control modulation. By combining ideas from spin-locking relaxometry with a statistically motivated robust estimation approach, our protocol allows for the simultaneous reconstruction of all the single-qubit and two-qubit cross-correlation spectra, including access to their distinctive nonclassical features. Only single-qubit control manipulations and state-tomography measurements are employed, with no need for entangled-state preparation or readout of two-qubit observables. While our experimental demonstration uses two superconducting qubits coupled to a shared, colored engineered noise source, our methodology is portable to a variety of dephasing-dominated qubit architectures. By pushing quantum noise spectroscopy beyond the single-qubit setting, our work heralds the characterization of spatiotemporal correlations in both engineered and naturally occurring noise environments., PRX Quantum, 1 (1), ISSN:2691-3399
- Published
- 2020
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