Scaling topological qubits in van der Waals heterostructures
Abstract
Bilayer graphene is the best platform in which to build a working topological qubit. Energy gaps for noon-Abelian ground states are as alrage as 5K, much larger than in competing systems based on semiconductor quantum wells and nanowires. New nanofabrication and assembly techniques now allow for single anyon confinement, braiding, and fusion to be realized. In addition, recent advances in quantum engineering via microwave circuitry, developed for precise control of spin and superconducting qubits, are rip for deployment for fundamentally more coherent topological qubits in VdW materials, While fabrication techniques for van der Waals remain largely manual, we note that even without improvements our architecture can be scaled to 100-1000 physical qubits, which, given realistic assumptions, are likely to break records for "quantum volume , a combined metric of qubit count and coherence. The proposal seeks support for a dilution refrigerator fitted with the appropriate magnet and coaxial lines to both perform fundamental demonstrations of the underlying technology and begin the path towards scaling. in the proposal, we provide background on the physics and fabrication of these devices, measurement geometry, and expected milestones enabled by this purchase. The equipment would support efforts already funded by the DoD, including a "measurement only approach to the same problem under an AFOSR-sponsored PECASE award and a separate proposed program to the ONR on developing architectures for braiding via anyon transport.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 29, 2023
- Source ID
- N000142312564
Entities
People
- Andrea Young
Organizations
- Office of Naval Research
- United States Navy
- University of Southern California