Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B73: Superconducting Qubits: Design and device tools |
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Sponsoring Units: DQI Chair: Alexander McDonald, Université de Sherbrooke Room: Room 405 |
Monday, March 6, 2023 11:30AM - 11:42AM |
B73.00001: KQCircuits: an open-source package for automating design of superconducting quantum processors Andrew Guthrie, Alessandro Landra, Johannes Heinsoo, David Janzso, Máté Jenei, Janne Kotilahti, Caspar Ockeloen-Korppi, Jukka Räbinä, Niko Savola, Pavel Smirnov, Kristinn Juliusson Superconducting circuits have gained significant importance in recent years due to their application to the field of quantum computing. The first step in the design of a superconducting quantum processors consists of accurately laying out the desired quantum circuits and connectivity into a lithography mask file. As the complexity of quantum processors grow, accurate design of the underlying superconducting circuit has become a significant challenge. |
Monday, March 6, 2023 11:42AM - 11:54AM |
B73.00002: Fluxonium Qubit Design and EPR analysis Figen Yilmaz, Siddharth Singh, Taryn V Stefanski, Martijn F. S. Zwanenburg, Christian K Andersen Fluxonium qubits promise a better, alternative solution for large-scale quantum computing in terms of lower error rates. Compared to the conventional transmon qubit, the fluxonium is realized with just one more element: a linear inductor. It is essential to have the Hamiltonian parameters of the device before the fabrication steps since numerical simulations guide the design process and can help in understanding and interpreting measurement results. State-of-the-art analysis of superconducting quantum circuits uses the energy participation ratio (EPR) method which extracts linear terms from finite element simulations and adds non-linear (quantum) terms using the energy participations extracted from the classical simulations. We designed and simulated a fluxonium qubit using IBM Qiskit-metal, which includes open-source code for EPR analysis. We also developed the EPR analysis library to treat the non-linear terms non-perturbative allowing for analysis beyond weakly anharmonic qubits. In this talk, I will show our design and simulation results. Moreover, I will extract the Hamiltonian for a fluxonium qubit and readout resonator and compare the simulation results with the measurement results. |
Monday, March 6, 2023 11:54AM - 12:06PM |
B73.00003: Efficient Design and Simulation of Parametrically Coupled Superconducting Qubits Zachary L Parrott, Tongyu Zhao, Kaixuan Ji, Katarina Cicak, Kristen Genter, José A Estrada Gonzalez, Raymond W Simmonds Superconducting circuits provide a rich landscape to realize a variety of qubit properties and interactions. To achieve an intended Hamiltonian an experiment designer needs an appropriate toolset to ensure they will achieve the goal and minimize unintended processes before committing to fabrication. We have been pursuing a design architecture of superconducting qubits and cavities with fast, tunable coupling mediated by parametric coupling. We seek a means to optimize the cancellation of unwanted static interactions alongside adequate mode tuneability to have strong parametric coupling rates. This requires good agreement between the increasing levels of complex design and simulation to the measurement of fabricated devices. We will discuss how we leverage lumped-circuit models, full-wave EM finite-element solvers and driven dynamics simulation to optimize the design of parametric multi-qubit cavity QED devices. This work leverages and builds on a variety of open-source software packages with ongoing development in the community. |
Monday, March 6, 2023 12:06PM - 12:18PM |
B73.00004: Analysis of arbitrary superconducting quantum circuits accompanied by a Python package: SQcircuit Taha Rajabzadeh, Alexander B McKeehan, Zhaoyou Wang, Nathan R Lee, Takuma Makihara, Yudan Guo, Amir H Safavi-Naeini Superconducting quantum circuits are a promising hardware platform for realizing a fault-tolerant quantum computer. Accelerating progress in this field of research demands general approaches and computational tools to analyze and design more complex superconducting circuits. We develop a framework to systematically construct a superconducting quantum circuit's quantized Hamiltonian from its physical description. As is often the case with quantum descriptions of multi-coordinate systems, the complexity rises rapidly with the number of variables. Therefore, we introduce a set of coordinate transformations with which we can find bases to diagonalize the Hamiltonian efficiently. Furthermore, we broaden our framework's scope to calculate the circuit's key properties required for optimizing and discovering novel qubits. We implement the methods described in this work in an open-source Python package SQcircuit. In this presentation, we introduce the audience to the technical implementation of SQcircuit and its functionalities with a series of examples. Moreover, we present our preliminary results for SQcircuit development to address the large-scale circuits and our roadmap to use machine learning techniques to discover novel quantum hardware. |
Monday, March 6, 2023 12:18PM - 12:30PM |
B73.00005: Loss estimation using Energy Participation Ratio in KQCircuits Niko Savola, Alessandro Landra, Jukka Räbinä, Eelis Takala, Janne Kotilahti, David Janzso, Pavel Smirnov, Vladimir Milchakov, Kristinn Juliusson, Sinan Inel, Máté Jenei, Johannes Heinsoo, Caspar Ockeloen-Korppi In the last decade, superconducting circuits have become one of the most promising platforms for quantum computing. However, the current quantum circuits and algorithms in the noisy intermediate-scale quantum era would benefit from longer qubit coherence. To this end, we present a new addition to KQCircuits (KQC) [1]. Support for energy participation ratio simulations is implemented by employing an open-source toolbox named pyEPR [2]. KQC is a GPLv3-licensed layout design tool developed at IQM Finland for creating state-of-the-art superconducting circuits and processors. |
Monday, March 6, 2023 12:30PM - 12:42PM |
B73.00006: Simulation of magnetic field and current density profile for flux-tunable superconducting qubit devices Tianpu Zhao, Xinyuan You, Shashwat Kumar, Xanthe Croot, Andrew A Houck, Jens Koch We adopt a finite-element method [1] to solve the Maxwell-London equations to simulate magnetic field and current distributions in superconducting qubit devices. Taking into account both externally applied magnetic fields and supercurrents allows us to compute the total magnetic flux through any circuit loop. This is relevant, in particular, for flux-tunable qubits where the field generated by a flux-bias line current or external electromagnet tunes the qubit frequency. Our simulation may help inform the layout design for flux-tunable qubit devices, and mitigate flux crosstalk in large-scale superconducting circuits [2]. |
Monday, March 6, 2023 12:42PM - 12:54PM |
B73.00007: Machine Learning-Based Predictive Model for Designing Transmon Qubits in Superconducting Quantum Computer Ferris Prima Nugraha, QIMING SHAO The transmon qubit enables the scalable design of superconducting circuit-based quantum computing hardware due to the low sensitivity to charge noise while enabling qubit-photon coupling for interaction. The pursuit of fault-tolerant and computationally powerful quantum processors may require more qubits, increasing the design and simulation complexity before the final fabrication and application. In this work, we attempt to predict the characteristics of individual transmon qubits with a machine learning-based approach based on the simulation data collected with Qiskit Metal and ANSYS Electronics. Similarly, we can also set the targeted characteristics of transmon and generate some feasible geometrical designs with a machine learning model. Further application of our method is possible for future quantum electronic design and automation of superconducting quantum computing circuits. |
Monday, March 6, 2023 12:54PM - 1:06PM |
B73.00008: Band-stop Filters for Protecting Parametric Operations in Superconducting Systems Kaixuan Ji, José A Estrada Gonzalez, Zachary L Parrott, Tongyu Zhao, José Aumentado, Raymond W Simmonds Introducing a parametric pump into a system of coupled qubits and a cavity is convenient for performing fast gates [1], dispersive readout [2], or generating entanglement [3]. However, adding a parametric control port can open up the system to noise and dissipation. As a solution, we have designed and tested a custom band-stop filter in order to isolate the quantum system, while still allowing precise parametric control. In this talk, I will discuss our filter design strategy and show experimental results. |
Monday, March 6, 2023 1:06PM - 1:18PM |
B73.00009: Superconducting resonators with voltage-controlled frequency and nonlinearity William M Strickland, Bassel H Elfeky, Joseph O Yuan, William F Schiela, PENG YU, Dylan Langone, Maxim G Vavilov, Vladimir E Manucharyan, Javad Shabani Voltage-tunable superconductor-semiconductor devices offer a unique platform to realize dynamic tunability in superconducting quantum circuits. By galvanically connecting a gated InAs-Al Josephson junction to a coplanar waveguide resonator, we demonstrate the use of a superconducting element with wideband gate-tunability. We show that the resonant frequency is controlled via a gate-tunable Josephson inductance and that the non-linearity of the InAs-Al junction is non-dissipative as is the case with conventional AlOx-Al junctions. As the gate voltage is decreased, the inductive participation of the junction increases up to 44%, resulting in the resonant frequency being tuned by over 2 GHz. Utilizing the wide tunability of the device, we demonstrate that two resonant modes can be adjusted such that they strongly hybridize, exhibiting an avoided level crossing with a coupling strength of 51 MHz. Implementing such voltage-tunable resonators is the first step toward realizing wafer-scale continuous voltage control in superconducting circuits for qubit-qubit coupling, quantum-limited amplifiers, and quantum memory platforms. |
Monday, March 6, 2023 1:18PM - 1:30PM |
B73.00010: Post-fabrication resonator frequency trimming enabling fast, high-fidelity dispersive readout of transmon qubits Santiago Valles-Sanclemente, Sean van der Meer, Matvey Finkel, Christos Zachariadis, Thijs Stavenga, Marc Beekman, Nadia Haider, Leonardo DiCarlo Fast, high-fidelity dispersive readout in circuit QED that does not impact qubit relaxation can be achieved using a dedicated Purcell-filter resonator coupled to the readout resonator. Optimal conditions are achieved when the bare frequencies of both resonators are accurately matched so that they form a hybridized system. This requirement can be challenging to meet in fabrication due to non-uniformity of the base layer thickness and previously untested design changes, among other reasons. We present a practical method allowing accurate trimming of the bare frequency of either resonator as gleaned necessary from initial device characterisation. We compare the speed of photon depletion before and after trimming and demonstrate the enhancement of readout fidelity and speed without impacting qubit relaxation. The method does not require extra fabrication steps and also allows the elimination of any frequency collisions between resonators used to measure different qubits with a common feedline. |
Monday, March 6, 2023 1:30PM - 1:42PM |
B73.00011: A power-meter based on superconducting qubits Danilo Labranca, Adam J Sirois, Manuel A Castellanos-Beltran, Peter Hopkins, David Olaya, John P Biesecker, Andrea Giachero Light-matter interaction is a fundamental process that has been widely investigated through atomic physics and quantum optics. Advancements in superconducting circuits have achieved strong coupling between transmission lines and transmon qubits, which are employed as artificial atoms. Because of this, microwave quantum optics experiments can now be performed, based on circuit quantum electrodynamics and superconducting qubits. |
Monday, March 6, 2023 1:42PM - 1:54PM |
B73.00012: Spectroscopic method for measuring the number of photons in superconducting Kerr parametric oscillators keisuke matsumoto, Aiko Yamaguchi, Tsuyoshi Yamamoto, Shiro Kawabata, Yuichiro Matsuzaki Quantum annealing (QA) is a way to solve combinational optimization problems. Kerr nonlinear parametric oscillators (KPOs) are promising devices for implementing QA. |
Monday, March 6, 2023 1:54PM - 2:06PM |
B73.00013: Characterizing Polariton States in the Non-Dispersive regime of cQED Arvind Mamgain, Samarth Hawaldar, Athreya Shankar, Baladitya Suri A superconducting qubit coupled to a resonator is currently the building block of multiple quantum computing as well as quantum optics experiments. A typical qubit-resonator system is coupled in the dispersive regime, where the detuning between the qubit and resonator is much greater than the coupling between them. In this work, we fabricated and measured a superconducting transmon qubit coupled to a lumped element resonator in non-dispersive regime. The dressed states formed by mixing the bare qubit and resonator states can be further mixed by applying a drive on the qubit, leading to the formation of polariton states. We report experimental studies of transitions between polariton states at varying driving strengths and frequencies. We observe the effects of the non-dispersively coupled higher transmon levels in our system. We also report close agreement with numerical results obtained from a driven Jaynes–Cummings Model beyond the dispersive regime. |
Monday, March 6, 2023 2:06PM - 2:18PM |
B73.00014: Analysing Polariton States in the Non-Dispersive regime of cQED Samarth Hawaldar, Arvind Mamgain, Athreya Shankar, Baladitya Suri Strongly driven qubit-resonator systems have recently gained attention as they can be used to generate polariton states. These are hybrid states obtained by dressing a coupled qubit-resonator system with a drive and can be of great utility in realizing phenomena such as electromagnetically induced transparency. Previous theoretical and experimental studies have almost exclusively limited themselves to the dispersive regime, where the qubit-resonator detuning is much greater than their coupling. In this work, we theoretically study a driven transmon -resonator system outside the dispersive regime. We analyze this system using two approaches that give complementary insights: eigenmode analysis and master equation simulations. We show how the non-dispersive coupling of the higher levels of the qubit-resonator system modifies the polariton eigenstates and the corresponding transition frequencies. Furthermore, we compare our predictions to experimental data from a lumped resonator-transmon system operating outside the dispersive regime and find excellent agreement between theory and experiment. |
Monday, March 6, 2023 2:18PM - 2:30PM |
B73.00015: Design of a current-biased tunable coupler integrated with superconducting 3D-cavities Eva Gurra, Ziyi Zhao, Konrad Lehnert Superconducting circuits are a leading platform for scalable quantum information processing. These macroscopic circuits can be easily controlled using magnetic flux generated by delivering current to an off-chip coil or an integrated on-chip coil. However, flux sensitive devices can suffer from flux offsets and environmental magnetic field fluctuations, and cannot be operated inside of superconducting enclosures. Furthermore, scaling up flux-controlled devices can be difficult, as large amounts of current may be required to deliver sufficient flux to each device. One solution for improved operation and scalability is to use current biasing. |
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