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Van der Waals Interactions

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.

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Miniaturizing Transmon Qubits Using van der Waals Materials.

Abhinandan Antony¹, Martin V Gustafsson², Guilhem J Ribeill²

¹Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States.

|November 18, 2021

Summary

This summary is machine-generated.

Researchers developed smaller quantum computing qubits using van der Waals materials, reducing area by over 1000x. This breakthrough enables higher qubit density and longer coherence times for advanced quantum processors.

Keywords:

2D materials hexagonal boron nitride niobium diselenide superconducting qubit van der Waals materials

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Area of Science:

Quantum Computing
Materials Science
Condensed Matter Physics

Background:

Superconducting qubits are crucial for quantum computation, but current designs require large capacitor electrodes.
Large qubit sizes lead to parasitic coupling, reduced addressability, and limited spatial density, hindering quantum processor scaling.
Lossy dielectrics in conventional qubits also compromise quantum coherence.

Purpose of the Study:

To explore the use of van der Waals (vdW) materials for miniaturizing superconducting qubits.
To maintain qubit capacitance and quantum coherence while significantly reducing physical footprint.
To demonstrate a viable pathway towards high-qubit-density quantum processors.

Main Methods:

Fabrication of novel qubits using a combination of aluminum-based Josephson junctions and vdW materials.
Utilized parallel-plate capacitors with crystalline superconducting niobium diselenide and hexagonal boron nitride layers.
Measured quantum coherence using the T1 relaxation time.

Main Results:

Achieved a >1000-fold reduction in qubit area compared to conventional designs.
Maintained essential qubit capacitance and quantum coherence.
Measured a T1 relaxation time of 1.06 μs for the vdW transmon qubit.

Conclusions:

Van der Waals materials offer a promising solution for creating compact, high-coherence superconducting qubits.
This approach facilitates the development of high-qubit-density quantum processors.
Layered heterostructures are broadly applicable to low-loss, high-coherence quantum device engineering.