Cryogenic microwave loss in epitaxial Al/GaAs/Al trilayers for superconducting circuits

McRae, Corey Rae; McFadden, Anthony; Zhao, Ruichen; Wang, H.; Long, Junling; Zhao, Tianyu; Park, S.; Bal, M.; Palmstrøm, C. J.; Pappas, David P.

doi:10.1063/5.0029855

Cited by 14 publications

(5 citation statements)

References 17 publications

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“…To date, conventional superconducting qubits are mostly fabricated by using amorphous aluminum and its oxide, which can host TLSs, limiting qubit coherence. Several possible paths have been recently followed to increase coherence: i) Replacing the oxide [35]; ii) Employing crystalline epitaxial materials such as GaAs [36] and nitrides [37,38]; and iii) Employing 2D vdW materials [39][40][41][42][43].…”

Section: Quantum Devices Built By Using Vdw Materialsmentioning

confidence: 99%

Materials and devices for fundamental quantum science and quantum technologies

Polini¹,

Giazotto²,

Fong³

et al. 2022

Preprint

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Technologies operating on the basis of quantum mechanical laws and resources such as phase coherence and entanglement are expected to revolutionize our future. Quantum technologies are often divided into four main pillars: computing, simulation, communication, and sensing & metrology. Moreover, a great deal of interest is currently also nucleating around energy-related quantum technologies. In this Perspective, we focus on advanced superconducting materials, van der Waals materials, and moiré quantum matter, summarizing recent exciting developments and highlighting a wealth of potential applications, ranging from high-energy experimental and theoretical physics to quantum materials science and energy storage.

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Section: Quantum Devices Built By Using Vdw Materialsmentioning

confidence: 99%

Materials and devices for fundamental quantum science and quantum technologies

Polini¹,

Giazotto²,

Fong³

et al. 2022

Preprint

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“…In this configuration, we study microwave loss using four samples containing superconducting high-quality factor LERs fabricated with different process steps (table 1). Resonator are widely used as short-loop characterization vehicles for superconducting qubit devices, since their lifetime time is limited by the same dominant microwave losses as in qubits [46]. Qubit specific loss sources, such as quasiparticle tunnelling or two-level-system (TLS) defects inside a Josephson junction, are not captured by this method, however these are generally not limiting the performance of widely used transmon qubits [47].…”

Section: Scalable Millikelvin Device Characterisationmentioning

confidence: 99%

Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation

Potočnik¹,

Brebels²,

Verjauw³

et al. 2021

Quantum Sci. Technol.

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Quantum computers based on solid state qubits have been a subject of rapid development in recent years. In current noisy intermediate-scale quantum 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.

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“…Approaches such as protected qubits can decouple from environmental noise, but improving the constituent materials can dramatically impact qubit technology by reducing the footprint and enhancing qubit coherence. As such, new material platforms for qubits are now actively explored. − …”

mentioning

confidence: 99%

Miniaturizing Transmon Qubits Using van der Waals Materials

et al. 2021

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Quantum computers can potentially achieve an exponential speedup versus classical computers on certain computational tasks, recently demonstrated in superconducting qubit processors. However, the capacitor electrodes that comprise these qubits must be large in order to avoid lossy dielectrics. This tactic hinders scaling by increasing parasitic coupling among circuit components, degrading individual qubit addressability, and limiting the spatial density of qubits. Here, we take advantage of the unique properties of van der Waals (vdW) materials to reduce the qubit area by >1000 times while preserving the capacitance while maintaining quantum coherence. Our qubits combine conventional aluminum-based Josephson junctions with parallel-plate capacitors composed of crystalline layers of superconducting niobium diselenide and insulating hexagonal boron nitride. We measure a vdW transmon T 1 relaxation time of 1.06 μs, demonstrating a path to achieve high-qubit-density quantum processors with long coherence times, and the broad utility of layered heterostructures in low-loss, high-coherence quantum devices.

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Cryogenic microwave loss in epitaxial Al/GaAs/Al trilayers for superconducting circuits

Cited by 14 publications

References 17 publications

Materials and devices for fundamental quantum science and quantum technologies

Materials and devices for fundamental quantum science and quantum technologies

Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation

Miniaturizing Transmon Qubits Using van der Waals Materials

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