Physical Review Applied最新文献_第3页

Performance enhancement in Josephson traveling-wave parametric amplifiers by tailoring the relative distance between junctions 通过调整结间的相对距离来提高约瑟夫森行波参量放大器的性能

2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-22 DOI: 10.1103/j2zs-d2wh

M. A. Galí Labarias, T. Yamada, Y. Nakashima, Y. Urade, Joan Claramunt, K. Inomata

{"title":"Performance enhancement in Josephson traveling-wave parametric amplifiers by tailoring the relative distance between junctions","authors":"M. A. Galí Labarias, T. Yamada, Y. Nakashima, Y. Urade, Joan Claramunt, K. Inomata","doi":"10.1103/j2zs-d2wh","DOIUrl":"https://doi.org/10.1103/j2zs-d2wh","url":null,"abstract":"Josephson traveling-wave parametric amplifiers with heterogeneously spaced junctions are theoretically investigated. We consider unit cells with three junctions and characterize their interaction by spatially displaced fields defined by node fluxes. To solve this problem we define the system action and apply the variational principle to obtain the static action, which determines the equations of motion. This work shows that gain and bandwidth can be increased by modifying the relative distance between junctions within the same unit cell, thus increasing the effective nonlinear interaction. We find an optimal sub-unit-cell size ratio, which maximizes both gain and bandwidth, while equally spaced junctions offer minimum performance. Even though this method does not rely on phase matching, the same device can operate at different pump frequencies, it requires a very large number of JJs to achieve gains above 20 dB. We show that this method can be combined with resonant-phase matching and predicts an ideal gain above 29 dB on a 4-GHz bandwidth with 1998 junctions. Despite possible challenges fabricating devices at the optimal sub-unit-cell size with current technologies, substantial gain increase can still be achieved at suboptimal sizes.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147893234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observation and mitigation of microwave echoes from dielectric defects in Josephson traveling-wave amplifiers 约瑟夫逊行波放大器介质缺陷微波回波的观测与抑制

2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-17 DOI: 10.1103/4h9r-5hv8

Matteo Boselli, Joel Grebel, A. Peugeot, Rémy Dassonneville, Benjamin Huard, Audrey Bienfait

{"title":"Observation and mitigation of microwave echoes from dielectric defects in Josephson traveling-wave amplifiers","authors":"Matteo Boselli, Joel Grebel, A. Peugeot, Rémy Dassonneville, Benjamin Huard, Audrey Bienfait","doi":"10.1103/4h9r-5hv8","DOIUrl":"https://doi.org/10.1103/4h9r-5hv8","url":null,"abstract":"Amplifying microwave signals with a noise close to the minimum imposed by quantum mechanics is now routinely performed with superconducting quantum devices. In particular, Josephson-based Traveling Wave Parametric Amplifiers (JTWPA) have shown record bandwidth with added noise close to the quantum limit. In this work, we report the appearance of echo signals emitted by JTWPAs driven by trains of high-power pulses exceeding their dynamical range. we explore the case of weak signals generated through high power pulses. By sending a train of such high-power pulses, beyond the 1 dB compression point of such amplifiers, we observe the appearance of echoes, solely due to the JTWPA. These echoes have micro-second coherence and we attribute their origin to microscopic defects in the amplifier dielectric layer. By analyzing the power and the coherence of the echo signal as a function of temperature, we estimate the dielectric loss brought by these defects, and their impact on the JTWPA quantum efficiency. We introduce a mitigation technique (BLAST) to prevent the appearance of these echoes, consisting in an additional high-power tone sent concurrently with each pulse. We demonstrate that it suppresses the spurious defect signals and we recover the typical gain and noise figure within 95% of their low-power values in 300 ns. These results can help to extend the use of JTWPAs in experiments where fast high-power sequences are necessary to generate weak microwave responses from the system under study, and also provide a path towards characterizing in-situ the dielectric losses of these devices.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://arxiv.org/pdf/2503.00190","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147903336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Using coherent feedback for a periodic clock 对周期时钟使用相干反馈

2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-16 DOI: 10.1103/b9hw-r9gk

Stefan Zeppetzauer, Leonardo Assis Morais, Xin He, G. J. Milburn, Arkady Fedorov

引用次数: 1

Spectral diffusion of nanomechanical resonators due to single quantum defects 单量子缺陷引起的纳米机械谐振器的光谱扩散

2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-16 DOI: 10.1103/22rx-v855

M. P. Maksymowych, Mert Yüksel, Oliver A. Hitchcock, Nathan Lee, Felix M. Mayor, Wentao Jiang, M. L. Roukes, Amir H. Safavi‐Naeini

{"title":"Spectral diffusion of nanomechanical resonators due to single quantum defects","authors":"M. P. Maksymowych, Mert Yüksel, Oliver A. Hitchcock, Nathan Lee, Felix M. Mayor, Wentao Jiang, M. L. Roukes, Amir H. Safavi‐Naeini","doi":"10.1103/22rx-v855","DOIUrl":"https://doi.org/10.1103/22rx-v855","url":null,"abstract":"Nanomechanical resonators promise diverse applications from mass spectrometry to quantum information processing, requiring long phonon lifetimes and frequency stability. Although two-level-system (TLS) defects govern dissipation at millikelvin temperatures, the nature of frequency fluctuations remains poorly understood. In nanoscale devices, where acoustic fields are confined to subwavelength volumes, strong coupling to individual TLSs should dominate over defect ensemble effects. In this work, we monitor fast spectral diffusion of phononic crystal nanomechanical resonators while varying the temperature (10 mK--1 K), drive power (${10}^{2}$--${10}^{5}$ phonons), and phononic band structure. We consistently observe random telegraph signals (RTSs), which we attribute to state transitions of individual TLSs. The spectral diffusion is well explained by mechanical coupling to individual far-off-resonant TLSs, which are either thermally excited or strongly coupled to thermal fluctuators. Understanding this fundamental decoherence process, particularly its RTS structure, opens a clear path toward noise suppression for quantum and sensing applications.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147885952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Characterization and optimization of tunable couplers via adiabatic control in superconducting circuits 超导电路中绝热控制可调谐耦合器的表征与优化

2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-02 DOI: 10.1103/wgqf-8rcy

Xuan Zhang, Xu Zhang, C. H. Chen, Kai Tang, Kangyuan Yi, Kai Luo, Zheshu Xie, Yuanzhen Chen, Tongxing Yan

{"title":"Characterization and optimization of tunable couplers via adiabatic control in superconducting circuits","authors":"Xuan Zhang, Xu Zhang, C. H. Chen, Kai Tang, Kangyuan Yi, Kai Luo, Zheshu Xie, Yuanzhen Chen, Tongxing Yan","doi":"10.1103/wgqf-8rcy","DOIUrl":"https://doi.org/10.1103/wgqf-8rcy","url":null,"abstract":"In the pursuit of scalable superconducting quantum computing, tunable couplers have emerged as a pivotal component, offering the flexibility required for complex quantum operations of high performance. In most current architectures of superconducting quantum chips, such couplers are not equipped with dedicated readout circuits to reduce complexity in both design and operation. However, this strategy poses challenges in precise characterization, calibration, and control of the couplers. In this work, we develop a hardware-efficient and robust technique based on adiabatic control to address this issue. The critical ingredient of this technique is adiabatic swap operation between a tunable coupler and nearby qubits. Using this technique, we have characterized and calibrated tunable couplers in our chips and achieved straightforward and precise control over these couplers. For example, we have demonstrated the calibration and correction of the flux distortion of couplers. In addition, we have also expanded this technique to tune the dispersive shift between a frequency-fixed qubit and its readout resonator over a wide range.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147893063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

High magnetic sensitivity via large-diameter-vortex stability in magnetic tunnel junctions through controlled anisotropy. 通过控制磁隧道结的各向异性，实现大直径涡旋稳定性，从而获得高磁灵敏度。

IF 4.4 2区物理与天体物理

Physical Review Applied Pub Date : 2025-09-01 Epub Date: 2025-09-23 DOI: 10.1103/41by-5p3c

Benjamin J Brown, Liam K Mitchell, Vineetha S Bheemarasetty, H Minh Cao, Justin N Kingsnorth, Jerome N Sanes, Gang Xiao

{"title":"High magnetic sensitivity via large-diameter-vortex stability in magnetic tunnel junctions through controlled anisotropy.","authors":"Benjamin J Brown, Liam K Mitchell, Vineetha S Bheemarasetty, H Minh Cao, Justin N Kingsnorth, Jerome N Sanes, Gang Xiao","doi":"10.1103/41by-5p3c","DOIUrl":"10.1103/41by-5p3c","url":null,"abstract":"Magnetic-annealing-induced uniaxial anisotropy is shown to influence vortex formation in magnetic tunnel junction (MTJ) free layers of various diameters, with micromagnetic simulations demonstrating a threshold for single-vortex formation that exhibits an inverse diameter dependence. Angular M-H curves were measured for MTJ multilayers under different annealing conditions, and reveal that a two-step orthogonal magnetic annealing process reduces the uniaxial anisotropy in the free layer from 1040 J/m3 to 130 J/m3. This reduction in anisotropy allows for vortex formation in MTJ sensors as large as 40 μm. Increasing the MTJ diameter leads to an enhancement of magnetic sensitivity up to 2.80%/Oe with the conventional definition, or 1.78%/Oe via an ac sensitivity measurement that verifies the nonhysteretic response. This result demonstrates an eightfold increase in vortex-MTJ sensitivity, compared with standard MTJs that have diameters limited to 5 μm, and this work provides the foundation for highly sensitive vortex-MTJ-based sensors for applications that require a nonhysteretic, ultrasensitive response.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13186255/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147982644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-phase-matched broadband amplification with a left-handed Josephson transmission line 自相位匹配宽带放大与左手约瑟夫森传输线

2区物理与天体物理

Physical Review Applied Pub Date : 2025-08-11 DOI: 10.1103/physrevapplied.24.024026

C. Kow, Viktor A. Podolskiy, Archana Kamal

{"title":"Self-phase-matched broadband amplification with a left-handed Josephson transmission line","authors":"C. Kow, Viktor A. Podolskiy, Archana Kamal","doi":"10.1103/physrevapplied.24.024026","DOIUrl":"https://doi.org/10.1103/physrevapplied.24.024026","url":null,"abstract":"Josephson traveling-wave parametric amplifiers (JTWPAs) are promising platforms for realizing broadband quantum-limited amplification of microwave signals. However, substantial gain in such systems is attainable only when strict constraints on phase matching of the signal, idler, and pump waves are satisfied---this is rendered particularly challenging in the presence of nonlinear effects, such as self- and cross-phase modulation, which scale with the intensity of propagating signals. In this work, we present a simple JTWPA based on ``left-handed'' (negative-index) nonlinear Josephson metamaterial, which has phase matching native to its design, precluding the need for any complicated circuit or dispersion engineering. The resultant efficiency of the four-wave-mixing process can implement gains in excess of 20 dB over few-gigahertz bandwidths with much shorter lines than previous implementations. Furthermore, the intrinsic phase matching considerably simplifies the JTWPA design and operation compared to the previous implementations based on ``right-handed'' (positive-index) Josephson metamaterials, making the proposed architecture particularly appealing for integration with large superconducting architectures. The left-handed Josephson transmission line introduced here constitutes an alternative modality in distributed Josephson circuits, and forms a crucial piece of the unified framework that can be used to inform the optimal design and operation of broadband microwave amplifiers.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147920200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Simple high-saturation-power quantum-limited rf-SQUID-array-based Josephson parametric amplifiers 简单的高饱和功率量子限制rf- squid阵列约瑟夫森参数放大器

2区物理与天体物理

Physical Review Applied Pub Date : 2025-07-29 DOI: 10.1103/physrevapplied.24.014052

Ryan Kaufman, Chenxu Liu, Katarina Cicak, Boris Mesits, Mingkang Xia, Chao Zhou, Maria Nowicki, José Aumentado, David Pekker, Michael Hatridge

{"title":"Simple high-saturation-power quantum-limited rf-SQUID-array-based Josephson parametric amplifiers","authors":"Ryan Kaufman, Chenxu Liu, Katarina Cicak, Boris Mesits, Mingkang Xia, Chao Zhou, Maria Nowicki, José Aumentado, David Pekker, Michael Hatridge","doi":"10.1103/physrevapplied.24.014052","DOIUrl":"https://doi.org/10.1103/physrevapplied.24.014052","url":null,"abstract":"High-fidelity quantum nondemolition qubit measurement is critical to error correction and rapid qubit feedback in large-scale quantum computing. Maximizing high-fidelity dispersive readout in superconducting qubits commonly requires passing a short and strong pulse through the qubit's readout resonator, which is then processed by a sufficiently high bandwidth, high saturation power, and quantum-limited amplifier. We have developed an amplifier design pipeline that combines time-domain simulation of the untruncated device Hamiltonian, fabrication constraints, and maximization of saturation power. We have realized an amplifier based on a modified trilayer (Nb-Al-${mathrm{Al}mathrm{O}}_{x}$-Nb) fabrication suite at NIST, which utilizes an array of 25 rf superconducting quantum interference devices embedded within a low-$Q$ resonator powered by a high-power voltage pump delivered via a diplexer on the signal port. We show that, despite the intensity of the pump, the device is quantum efficient and capable of high-fidelity measurement limited by state transitions in the transmon. We present experimental data demonstrating up to $ensuremath{-}91.2phantom{rule{0.2em}{0ex}}mathrm{dBm}$ input saturation power with 20-$dB$ gain, up to 28-MHz instantaneous bandwidth, and phase-preserving qubit measurements with $62mathrm{%}$ quantum efficiency.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147904285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Constant-depth fan-out with real-time feedforward on a superconducting quantum processor 在超导量子处理器上具有实时前馈的恒定深度扇出

2区物理与天体物理

Physical Review Applied Pub Date : 2025-07-23 DOI: 10.1103/q418-pydy

Yongxin Song, Liberto Beltrán, Ilya S. Besedin, Michael Kerschbaum, Marek Pechal, François Swiadek, Christoph Hellings, Dante Colao Zanuz, Alexander Flasby, Jean-Claude Besse, Andreas Wallraff

{"title":"Constant-depth fan-out with real-time feedforward on a superconducting quantum processor","authors":"Yongxin Song, Liberto Beltrán, Ilya S. Besedin, Michael Kerschbaum, Marek Pechal, François Swiadek, Christoph Hellings, Dante Colao Zanuz, Alexander Flasby, Jean-Claude Besse, Andreas Wallraff","doi":"10.1103/q418-pydy","DOIUrl":"https://doi.org/10.1103/q418-pydy","url":null,"abstract":"When using unitary gate sequences, the growth in depth of many quantum circuits with output size poses significant obstacles to practical quantum computation. The quantum fan-out operation, which reduces the circuit depth of quantum algorithms such as the quantum Fourier transform and Shor’s algorithm, is an example that can be realized in constant depth independent of the output size. Here, we demonstrate a quantum fan-out gate with real-time feedforward on up to four output qubits using a superconducting quantum processor. By performing quantum state tomography on the output states, we benchmark our gate with input states spanning the entire Bloch sphere. We decompose the output-state error into a set of independently characterized error contributions. We extrapolate our constant-depth circuit to offer a scaling advantage compared to the unitary fan-out sequence beyond 25 output qubits with feedforward control, or beyond 17 output qubits if the classical feedforward latency is negligible. Our work highlights the potential of midcircuit measurements combined with real-time conditional operations to improve the efficiency of complex quantum algorithms.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Nonreciprocal scattering in a microwave frequency comb 微波频率梳中的非互反散射

2区物理与天体物理

Physical Review Applied Pub Date : 2025-06-20 DOI: 10.1103/kz53-dryz

C. Bock, J. C. Rivera Hernández, Fabio Lingua, David B. Haviland

引用次数: 0