Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A39: Superconducting and Semiconductor Qubits I/O, Packaging, and 3D IntegrationFocus Recordings Available
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Sponsoring Units: DQI Chair: Jimmy Chen, Google Room: McCormick Place W-196A |
Monday, March 14, 2022 8:00AM - 8:36AM |
A39.00001: Cryogenic Floating Gate CMOS Circuits for Quantum Control Invited Speaker: David Reilly
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Monday, March 14, 2022 8:36AM - 8:48AM |
A39.00002: Controlling transmon qubits with a low-power cryogenic CMOS AWG Devin L Underwood, Joseph Glick, Ken Inoue, Scott Lekuch, David Frank, Matthew A Beck, Pat Rosno, Raphael Robertazzi, Sudipto Chakraborty, John Timmerwilke, Brian Gaucher, Daniel Friedman Next generation quantum computers will undergo a paradigm shift whereupon multi qubit devices will predominantly perform circuits that support quantum error correction. This new era of quantum computing will require orders of magnitude more qubits than are currently being produced today, and at that scale cryogenic control electronics are considered a key technology in order to facilitate high performance operations. Here we present results demonstrating coherent control of transmon qubits using a low-power general-purpose CMOS RF AWG in 14nm FinFET technology, that is thermally anchored to the 4K stage of a dilution refrigerator. We evaluate the impact of control noise on qubit performance, and draw comparisons between the cryogenic CMOS RF AWG and standard RF room control electronics. |
Monday, March 14, 2022 8:48AM - 9:00AM |
A39.00003: Non-reciprocal microwave devices with a topological material Luis A Martinez, Gang Qiu, Gianpaolo P Carosi, Kang Wang, Jonathan L DuBois, Dongxia Qu Cryogenic circulators and isolators are nonreciprocal devices indispensable in shielding qubits against noise coming from the output measurement chain of superconducting quantum computing architectures and axion dark matter search experiments. However, conventional nonreciprocal ferrite devices are several centimeters in size and, thereby, impose a space limitation when scaling superconducting quantum computing systems. Here, we explore how micron-sized devices made from topological materials exhibit non-reciprocity, thus, enabling the potential for on-chip devices orders-of-magnitude smaller than conventional ferrite devices. Our devices use quantized anomalous Hall materials [1] patterned with circuit structures to realize an isolation of more than 20 dB and a bandwidth of approximately 160 MHz. We will discuss important circuit parameters unique to the chiral topological materials that may shed light to future device design. |
Monday, March 14, 2022 9:00AM - 9:12AM |
A39.00004: Coupling qubits on separate chips in a tileable superconducting circuit Giulio Campanaro, Shuxiang Cao, Simone D Fasciati, James F Wills, Mustafa S Bakr, Vivek Chidambaram, Boris Shteynas, Peter J Leek Superconducting quantum circuits are a promising hardware platform for the simulation of lattice Hamiltonians, but circuits are typically defined on a planar surface, limiting connectivity to 2D. |
Monday, March 14, 2022 9:12AM - 9:24AM |
A39.00005: Scalable Quantum i/o: Advances in Integrated Cryogenic Microwave Components in Flexible Stripline Structures Part 1/2 Kiefer Vermeulen, Daniel Bouman, Ruben van Gulik, Chun Heung Wong, Wouter Bos, Nikolai Drobotun, Rob van den Brink, Jakob Kammhuber, Patrick Paluch, Viktor Adam, Wolfgang Wernsdorfer, Ioan-Mihai Pop, Vivien Thiney, Laurent Colas, Michel Pioro-Ladrière, Marc-André Tétrault, Daan Kuitebrouwer, Sal Bosman Conventional cryogenic coaxial cabling and filtering solutions for quantum computing have limited scaling potential towards and beyond the kQbit regime due to cost, connection-density, form-factor and heat-load. In this work, we present advances in monolithic flexible RF cabling, which directly connects room temperature electronics to the cryogenic interface of a quantum device. |
Monday, March 14, 2022 9:24AM - 9:36AM |
A39.00006: Scalable Quantum i/o: Advances in Integrated Cryogenic Microwave Components in Flexible Stripline Structures Part 2/2 Daniël Bouman, Kiefer Vermeulen, Ruben van Gulik, Chun Heung Wong, Wouter Bos, Nikolai Drobotun, Rob van den Brink, Jakob Kammhuber, Patrick Paluch, Viktor Adam, Wolfgang Wernsdorfer, Ioan-Mihai Pop, Vivien Thiney, Laurent Colas, Marc-André Tétrault, Michel Pioro-Ladriere, Daan Kuitenbrouwer, Sal Bosman Conventional cryogenic coaxial cabling and filtering solutions for quantum computing have limited scaling potential towards and beyond the kQbit regime due to cost, connection-density, form-factor and heat-load. In this work, we present advances in monolithic flexible RF cabling, which directly connects room temperature electronics to the cryogenic interface of a quantum device. |
Monday, March 14, 2022 9:36AM - 9:48AM |
A39.00007: Atomic Layer Deposited Niobium and Titanium Nitrides for Superconducting Resonators and Superconducting Through Silicon Vias Nicholas Nugent, Jharna Paul, Valentino Seferai, Tania Hemakumara, James Grant, Myunglae Jo, Yi Shu, Dmytro Besprozvannyy, Tobias Lindstrom, Russ Renzas, Martin P Weides The next generation of superconducting quantum devices require both 3D integration and reduced loss. While early devices in the field have largely been made with Nb and Al, these materials have lossy surface oxides and are not compatible with conformal deposition techniques required for superconducting through silicon vias. Superconducting nitrides have emerged as a compelling alternative due their potential for reduced surface oxide-induced loss and compatibility with conformal deposition techniques such as Atomic Layer Deposition (ALD). While TiN has been thoroughly studied with sputtering and CVD, little work has been published with ALD or promising alternative nitrides such as NbN, NbTiN, and TaN. |
Monday, March 14, 2022 9:48AM - 10:00AM |
A39.00008: Qubit control using a CMOS DAC at mK tempertures Rene Otten, Lea Schreckenberg, Patrick Vliex, Julian Ritzmann, Arne Ludwig, Andreas D Wieck, Hendrik Bluhm Scaling up a quantum processor to tackle real-world problems requires qubit numbers in the millions. Scaleable semiconductor-based architectures have been proposed, many of them relying on integrated control instead of room-temperature electronics. However, it has not yet been shown that this can be achieved. For developing a high-density, low-cost wiring solution, it is highly advantageous for the electronics to be placed at the same temperature as the qubit chip. Therefore, tight integration of the qubit chip with ultra low power CMOS electronics presents a promising route. We demonstrate DC biasing qubit electrodes using a custom-designed 65nm CMOS capacitive DAC operating below 100mK [1]. Our chip features a complete proof of principle solution including interface, DAC memory and logic, the capacitive DAC, and sample-and-hold structures to provide voltages for multiple qubit gates. The bias DAC is combined with the qubit using a silicon interposer chip, enabling flexible routing and tight integration. Voltage stability, noise performance, and temperature are benchmarked using the qubit chip. Our results validate the potential of very low power qubit biasing using highly integrated circuits. |
Monday, March 14, 2022 10:00AM - 10:12AM |
A39.00009: Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation Anton Potocnik, Steven Brebels, Jeroen Verjauw, Rohith Acharya, Alexander Grill, Danny Wan, Massimo Mongillo, Ruoyu Li, Tsvetan Ivanov, Steven Van Winckel, Fahd A. Mohiyaddin, Bogdan Govoreanu, Jan Craninckx, Iuliana P Radu Quantum computers based on solid state qubits have been a subject of rapid development in recent years. In current Noisy Intermediate-Scale Quantum (NISQ) technology, each quantum device is controlled and characterised through a dedicated signal line between room temperature and base temperature of a dilution refrigerator. This approach is not scalable and is currently limiting the development of large-scale quantum system integration and quantum device characterisation. Here we demonstrate a custom designed cryo-CMOS multiplexer operating at 32 mK. The multiplexer exhibits excellent microwave properties up to 10 GHz at room and millikelvin temperatures. We have increased the characterisation throughput with the multiplexer by measuring four high-quality factor superconducting resonators using a single input and output line in a dilution refrigerator. Our work lays the foundation for large-scale microwave quantum device characterisation and has the perspective to address the wiring problem of future large-scale quantum computers. |
Monday, March 14, 2022 10:12AM - 10:24AM |
A39.00010: Characterizing a custom-designed cryo-CMOS multiplexer with superconducting qubits Rohith Acharya, Anton Potočnik, Steven Brebels, Alexander Grill, Jeroen Verjauw, Tsvetan Ivanov, Daniel Perez Lozano, Danny Wan, Fahd A. Mohiyaddin, A. M. Vadiraj, Jacques Van Damme, Massimo Mongillo, Georges Gielen, Francky Catthoor, Jan Craninckx, Iuliana P Radu, Bogdan Govoreanu The integration of cryo-CMOS based control electronics in close proximity to qubits has significant advantages for large-scale superconducting quantum processors. However, the heat dissipation of such devices introduces additional thermal noise that affects the qubit performance. Experiments studying the impact of cryo-CMOS components on the behavior of superconducting qubits at millikelvin temperatures are currently lacking. Here, we explore the feasibility of including cryo-CMOS components near superconducting qubits by measuring a low-power custom-designed multiplexer operating at the base temperature of a dilution refrigerator. We characterize the noise properties of the multiplexer by configuring it as a passive thermal load to drive noise photons on the readout resonator of a qubit. By measuring the qubit's dephasing rate, we estimate the thermal noise power irradiated from the multiplexer. We show that with appropriate signal attenuation and thermalization, the qubit's performance is maintained. Our results demonstrate that properly optimized cryo-CMOS components placed at the base temperature of a dilution refrigerator can be used to reliably address multiple qubits, ultimately enabling large-scale quantum device characterization. |
Monday, March 14, 2022 10:24AM - 10:36AM |
A39.00011: Hybrid 2D/3D integrated readout multiplexing in circuit QED Mustafa S Bakr, Shuxiang Cao, Giulio Campanaro, Simone D Fasciati, James F Wills, Vivek Chidambaram, Boris Shteynas, Peter J Leek As the field of superconducting quantum circuits progresses to large scale devices, methods for readout multiplexing are required to reduce hardware overheads. Typically, reported architectures use on-chip integration to address readout resonators, which can introduce unwanted circuit crosstalk. Here we present a method to multiplex readout resonators out-of-plane, featuring off-chip 3D integration and Purcell filtering of qubit radiative decay. We demonstrate the method in a prototype device, performing multiplexed readout of a four transmon device in a single 1.6 GHz wide readout channel, characterising the readout crosstalk and qubit coherence. Measurements of T1>200 µs inside the filter band demonstrate the compatibility of this 3D-integrated multiplexing architecture with high coherence multi-qubit devices. |
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