Two-Dimensional Material Tunnel Barrier for Josephson Junctions and Superconducting Qubits

Lee, Kan Heng; Chakram, Srivatsan; Kim, Shi En; Mujid, Fauzia; Ray, Ariana; Gao, Hui; Park, Chibeom; Zhong, Yu; Muller, David A.; Schuster, David I.; Park, Jiwoong

doi:10.1021/acs.nanolett.9b03886

Cited by 35 publications

(37 citation statements)

References 38 publications

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“…These additional features may enable more complex topological encoding of information and an intrinsic resilience to decoherence. Recent experimental work has demonstrated qubits based on MoS 2 , 179 MoTe 2 , 180 and NbSe 2 181 junctions.…”

Section: [H1] Emerging Josephson Devicesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

143

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Advances in materials science and engineering have played a central role in the development of classical computers, and will undoubtedly be critical in propelling the maturation of quantum information technologies. In approaches to quantum computation based on superconducting circuits, as one goes from bulk materials to functional devices, amorphous insulating films and nonequilibrium excitations-electronic and phononic-are introduced, leading to dissipation and fluctuations that limit the computational power of state-of-the-art qubits and processors. In this Review, the major sources of decoherence in superconducting qubits are identified through an exploration of seminal qubit and resonator experiments. The proposed microscopic mechanisms associated with these imperfections are summarized, and directions for future research are discussed. The trade-offs between simple qubit primitives based on a single Josephson tunnel junction and more complex designs that use additional circuit elements, or new junction modalities, to reduce sensitivity to local noise sources are discussed, particularly in the context of materials optimization strategies for each architecture.

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Section: [H1] Emerging Josephson Devicesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

143

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“…Except for these devices discussed earlier, 2DMs also offer the possibility to realize other single photodetection devices by 2D superconductors. [131,339]…”

Section: Magneto-optic Isolatormentioning

confidence: 99%

Two‐Dimensional Materials for Integrated Photonics: Recent Advances and Future Challenges

Yin

et al. 2021

Small Science

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With the development of novel optoelectronic materials and nanofabrication technologies, integrated photonics is a rapidly developing field that will promote the development and application of next‐generation photonic devices. In recent years, emerging two‐dimensional materials (2DMs) including graphene, transition metal dichalcogenides (TMDCs), black phosphorus (BP), and ternary compounds show many complementarities and unique characteristics over those of traditional optoelectronic materials including broadband absorption, ultrafast carrier mobility, strong nonlinear effects, and compatibility for monolithic integration. Herein, the recent progress on waveguide‐integrated active devices for a full photonic circuit based on 2DMs is reviewed. Both the development of nanofabrication techniques and the working mechanism of active photonic components based on 2DMs containing integrated light sources, waveguide‐integrated modulators, photodetectors, as well as some advanced 2DMs‐based optoelectronic devices are illustrated in detail. In the end, the existing challenges and perspectives on novel 2DMs‐integrated photonics are summarized and discussed.

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“…Approaches such as protected qubits can decouple from environmental noise (6), 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 (7)(8)(9)(10)(11)(12)(13).…”

mentioning

confidence: 99%

“…While both the MET and vdW transmon accomplish miniaturization, the METs demonstrated so far use amorphous insulators which are known to harbor TLSs. As the vdW heterostructure can also function as a high-quality JJ (8,25,26), one can envision a future vdW-MET consisting of a crystalline vdW material as the tunnel barrier.…”

mentioning

confidence: 99%

Miniaturizing transmon qubits using van der Waals materials

Antony

Gustafsson

Ribeill

et al. 2021

Preprint

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Quantum computers can potentially achieve an exponential speedup versus classical computers on certain computational tasks, recently demonstrated in systems of superconducting qubits. 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 required capacitance without increasing substantial loss. 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 $\mu$s, which demonstrates 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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Two-Dimensional Material Tunnel Barrier for Josephson Junctions and Superconducting Qubits

Cited by 35 publications

References 38 publications

Engineering high-coherence superconducting qubits

Engineering high-coherence superconducting qubits

Two‐Dimensional Materials for Integrated Photonics: Recent Advances and Future Challenges

Miniaturizing transmon qubits using van der Waals materials

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