Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session C26: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |
Hide Abstracts |
Sponsoring Units: DQI Chair: Jose Aumentado Room: BCEC 160B |
Monday, March 4, 2019 2:30PM - 2:42PM |
C26.00001: Broadband design of parametric non-reciprocal devices Ofer Naaman, Jose Aumentado, John M Martinis
|
Monday, March 4, 2019 2:42PM - 2:54PM |
C26.00002: Quantum discord in squeezed microwaves Kirill Fedorov, Stefan Pogorzalek, Minxing Xu, Michael Renger, Michael Fischer, Edwar Xie, Qi-Ming Chen, Achim Marx, Frank Deppe, Rudolf Gross Quantum discord is known as a general measure for quantum correlations in bipartite systems. It encompasses all nonclassical correlations including entanglement. Quantum discord has many intriguing fundamental properties many of which require experimental verification such as the asymptotic robustness towards environmental noise. We experimentally investigate quantum discord in propagating two-mode squeezed (TMS) microwave states generated with the help of superconducting Josephson parametric amplifiers. We exploit asymmetric noise injection into these TMS states which allows us to demonstrate the robustness of quantum discord as opposed to the sudden death of entanglement. Finally, we discuss the relevance of quantum discord as a resource in quantum communication and sensing , in particular with respect to remote state preparation and quantum radar protocols. |
Monday, March 4, 2019 2:54PM - 3:06PM |
C26.00003: Proposal for a novel directional parametric amplifier requiring no external nonreciprocal components Andrew Lingenfelter, Volodymyr Sivak, Shyam Shankar, Michel H. Devoret Quantum-limited Josephson parametric amplifiers are an important part of most superconducting qubit readout systems. Parametric amplifiers typically operate in reflection and require external nonreciprocal devices to spatially separate the input and output fields of the amplifier and to protect the qubit from noise propagating from the output field. To achieve this without additional external components, the parametric amplifier should have a matched input port, large forward gain from input to output, ideally zero reverse gain from output to input, a matched output port, and an auxiliary port which provides amplified quantum noise to the output. We propose a novel four-port phase-preserving parametric amplifier that satisfies all of the above requirements. This proposal is a natural extension of the previously realized three-port directional amplifier, but does not require an isolator on its output. We discuss the properties of this proposal, and we present a possible experimental implementation. |
Monday, March 4, 2019 3:06PM - 3:18PM |
C26.00004: Theoretical study of nonreciprocal microwave transmission based on Gebhard-Ruckenstein hopping Shumpei Masuda, Shingo Kono, Keishi Suzuki, Yuuki Tokunaga, Yasunobu Nakamura, Kazuki Koshino Several types of quantum information processing schemes and many of superconducting quantum optics experiments require routing of microwaves in a cryostat. Thus, cryogenic circulator is an important tool, and the loss at the circulators is detrimental especially for quantum information processing. This has been urging many researchers to experimental and theoretical works devoted to lossless on-chip microwave circulators. |
Monday, March 4, 2019 3:18PM - 3:30PM |
C26.00005: Exploiting the Kerr-free point of a SNAIL for improvement of dynamic range in parametric amplifiers Volodymyr Sivak, Andrew Lingenfelter, Nicholas E. Frattini, Vidul Joshi, Wei Dai, Shyam Shankar, Michel H. Devoret Quantum-limited Josephson parametric amplifiers are an important component for most superconducting qubit readout methods. While being well optimized for the noise performance, the scalability of resonant parametric amplifiers is determined predominantly by the ability to boost their dynamic range and bandwidth. The dynamic range of the state-of-the-art "paramps" is limited by the spurious Kerr-induced Stark shifts which detune the paramp from its operating point, leading to the reduction of gain with increased signal power. We show that using a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) as an active element, we are able to tune to a Kerr-free sweet spot in the presence of the pump, which exhibits significantly improved 1 dB compression power. |
Monday, March 4, 2019 3:30PM - 3:42PM |
C26.00006: Towards a SQUID-based Traveling Wave Parametric Amplifier Luca Planat, Karthik Srikanth Bharadwaj, Olivier Buisson, Remy Dassonneville, Jovian Delaforce, Farshad Foroughi, Wiebke Guichard, Sébastien Leger, Vladimir Milchakov, Cecile Naud, Javier Puertas, Nicolas Roch Superconducting Parametric Amplifiers are key to research fields involving microwave signals in the quantum regime, such as superconducting qubits or NEMs because of the large gain they provide and their noise performance. Large interaction time between a weak microwave signal, a strong coherent pump tone and a non-linear medium is required to obtain enough gain. Up to now, this was achieved by coupling the non-linear medium to a resonator. But this is also possible by using distributed non-linear media and working in transmission, thus overriding issues of limited bandwidth due to resonant cavities. When the medium is a Josephson junction, this new class of amplifier is called Josephson Traveling Wave Parametric Amplifier (J-TWPA) [1]. We will present our on-going effort to develop a SQUID-based TWPA. It will allow to tune in situ the characteristic impedance of the TWPA to have a perfect impedance match with the rest of the electronic setup, despite the uncertainty of the electrical properties of the device due to the fabrication process. |
Monday, March 4, 2019 3:42PM - 3:54PM |
C26.00007: Design and Fabrication of Broadband Parametric Amplifiers for Quantum Applications Joel Grebel, Audrey Bienfait, Etienne Dumur, Hung-Shen Chang, Ming-Han Chou, Christopher Conner, Gregory A Peairs, Rhys G Povey, Kevin Satzinger, Youpeng Zhong, Andrew N Cleland Josephson parametric amplifiers (JPAs) provide a straightforward means for the quantum-limited amplification of signals, with noise approaching 1/2-photon for phase-independent gain [1]. These are an important resource for the single-shot readout of superconducting qubits, allowing high fidelity measurements of single as well as multiplexed qubits. I will describe the circuit designs and fabrication process for JPAs developed at the University of Chicago, fabricated in a new nanofabrication facility. The process includes low-loss dielectric deposition, superconducting crossovers, and a Dolan-bridge based Josephson junction definition. We will present data on lumped-element JPA devices with state-of-the-art gain, saturation power, and bandwidth [2], and describe different circuit designs for achieving large bandwidths [3]. |
Monday, March 4, 2019 3:54PM - 4:06PM |
C26.00008: WITHDRAWN ABSTRACT
|
Monday, March 4, 2019 4:06PM - 4:18PM |
C26.00009: Design of an on-chip superconducting microwave circulator with octave bandwidth Benjamin Chapman, Eric Rosenthal, Konrad Lehnert Standard techniques for the measurement of superconducting qubits rely on non-reciprocal devices like circulators to isolate sensitive quantum circuits and/or duplex parametric amplifiers. Commercial ferrite circulators are broadband, but are also bulky and lossy, and cannot be easily miniaturized as superconducting circuits because of their large permanent magnets. Here we present the design of a broadband, superconducting, on-chip circulator composed of dynamically modulated transfer switches and delays. Design goals are set for the multiplexed readout of superconducting qubits, and for integration with broadband quantum limited amplifiers. Simulations of the device with realistic parameters show that it allows for low-loss circulation (insertion loss < 0.35 dB and isolation > 20 dB) over an instantaneous bandwidth of 2.3 GHz. As the device is estimated to be linear for input powers up to -65 dBm, this design improves on the bandwidth and power-handling of previous superconducting circulators by over a factor of 50. |
Monday, March 4, 2019 4:18PM - 4:30PM |
C26.00010: A Fast Tunable, Large Bandwidth Superconducting Microwave Switch Hung-Shen Chang, Kevin Satzinger, Youpeng Zhong, Audrey Bienfait, Ming-Han Chou, Christopher Conner, Etienne Dumur, Joel Grebel, Gregory A Peairs, Rhys G Povey, Andrew N Cleland Fast controlled switches are a key feature in classical communication architectures, and likely will play an analogous role in quantum communication applications. Conventional semiconductor-based microwave switches have been used with superconducting quantum circuits, enabling for example the in-situ measurement of multiple devices via a common readout chain. However, theses switches dissipate energy when switched, making them unsuitable for applications requiring rapid, repeated switching. Josephson junction-based switches can be designed for dissipation-free operation with fast switching, and can be more readily integrated with superconducting quantum circuits, providing a very appealing alternative to semiconductor switches. Here, we present the design and characterization of a lossless single pole double throw (SPDT) superconducting switch based on tunable DC SQUIDs. The switch features fast switching times, large bandwidth, and a large on/off ratio. Applications for this device include coherent switch of itinerant photons for applications in quantum information, including quantum computation. |
Monday, March 4, 2019 4:30PM - 4:42PM |
C26.00011: Low-loss ferrite waveguide circulator for non-reciprocal circuit QED Yingying Wang, Thomas Connolly, Chen Wang In a quantum information processing network, it is highly desirable to have low-loss directional transmission channels with circulators/isolators to control the information flow while maintaining high fidelity. Moreover, such directional channels can be used to mediate non-reciprocal interactions between qubits or cavities to stabilize entanglement or novel many-body states. Here, using single crystalline yttrium iron garnet (YIG) in a waveguide-based package, we realize a microwave circulator with insertion loss of ~1% and isolation of >20 dB in the quantum regime (at single-photon power and 20 mK temperature). The circulator can be converted into a multi-mode cavity, which enables detailed study of hybridized magnon-photon spectra and the internal loss of various modes. The circulator operates at a relatively low magnetic field of 25 mT (significantly below saturation magnetization of YIG), allowing for direct coupling to transmons qubits and superconducting cavities under proper magnetic shielding. We will describe our ongoing progress towards a 3D circuit QED platform with non-reciprocal qubit-qubit interactions. |
Monday, March 4, 2019 4:42PM - 4:54PM |
C26.00012: Broadband superconducting switches for integrated quantum networks Eric Rosenthal, Christian M.F. Schneider, Benjamin J. Chapman, Leila R. Vale, Gene C. Hilton, K. W. Lehnert Switching elements are a generally useful tool in superconducting circuit experiments. They may be used to reconfigure the connectivity of a network, multiplex qubit readout, and create non-reciprocal devices. In particular, broadband switches allow for the construction of a broadband, on-chip microwave circulator. For integration with superconducting qubits, however, these switches must be low-loss and dissipate negligible heat when switching. Engineering such switches requires reactive circuit elements that tune rapidly between low and high impedance. To achieve these effects, we develop widely tunable SQUID arrays and present measurements of their performance. We then describe a new generation of broadband superconducting switches. |
Monday, March 4, 2019 4:54PM - 5:06PM |
C26.00013: Josephson Junction-Based Components for Scalable Quantum Computing Brittany Richman, Cosmic Raj, Jacob Taylor The physical realization of larger quantum computing schemes will require highly scalable signal processing architectures for precise qubit control. Various microwave components are needed for signal routing and isolation, but the size and design of commercially available components are not always feasible for on-chip solutions. With this motivation, we examine how arrays of Josephson junctions in external magnetic fields provide the potential to replace larger devices using the ordering of flux degrees of freedom in the arrays. As a key example, we consider models of circulators, non-reciprocal devices that enable isolation of quantum circuits. |
Monday, March 4, 2019 5:06PM - 5:18PM |
C26.00014: Efficient qubit measurements with a nonreciprocal microwave amplifier Florent Lecocq, Leonardo M Ranzani, Gabriel Peterson, Katarina Cicak, X. Y. Jin, Raymond Simmonds, John Teufel, Jose Aumentado In typical circuit quantum electrodynamics and microwave optomechanics system, the measurement of the observable of interest --- the state of a quantum bit or the position of a mechanical oscillator --- hinges on the efficient detection of the phase shift that it imparts on a microwave field. Ideal measurement efficiency can only be achieved with a lossless single quadrature measurement apparatus and has been a longstanding challenge. Nonreciprocal parametric amplifiers could enable such high measurement efficiency as they can be directly integrated with the quantum system, avoiding common technical losses due to circulators, cables and connectors used in state-of-the-art amplification chains. |
Monday, March 4, 2019 5:18PM - 5:30PM |
C26.00015: Anomalous Supercurrents in exciton-condensate/normal-barrier/exciton-condensate (EC/N/EC) junctions Jung-Jung Su, Ya-Fen Hsu The exciton-condensate/normal-barrier/exciton-condensate (EC/N/EC) junction in a bilayer consist of a normal barrier sandwiched between two exciton condensates (ECs), while the two ECs retain a relative phase of φ0. It is a setup inspired by the superconducting Josephson junction but with a special ingredient – the interlayer tunneling. In EC/N/EC junctions of short-barrier, fractional solitons with topological charge Q = φ0/2π are predicted to occur. In this paper, however, we focus on the case that the barrier length dJ is larger than the excitonic coherence length ξ. We find that the supercurrent occurs because of a distinctive mechanism – an Andreev reflection occurs in one of the EC/N interfaces along with the interlayer tunneling in the barrier. This exotic mechanism gives rise to only a half portion of a fractional soliton that carries a doubled topological charge 2Q = φ0/π (for the same relative phase φ0). The distinction in topology between the EC/N/EC junctions of short- and long-barrier is reflected in the supercurrents and their current phase relations, which can be observed directly by experiments. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700