Measurement- Only Quantum Bits with Bulk Nonabelian Anyons on Graphene
Abstract
Quantum computation is predicted to have broad technological implications from cryptography to search and logistical optimization. Recent advances have demonstrated successful control of systems as large as 50 physical quantum bits (qbits) in trapped atom and superconducting qubit systems. However, the highest impact applications of quantum computing require comparable numbers of logical qubits, operating free of errors. Topological quantum computation offers an alternate path. In this paradigm, qubits are constructed from degrees of freedom in a solid state material that, by virtue of the entanglement structure of the states from which they arise, are fundamentally immune to decoherence. This proposal seeks to realize topological qubits leveraging the full protection of quantum information afforded by the long range entanglement native to certain strongly correlated states of electrons. These include Fibonacci anyons, whose richer topological degeneracies enable full fault-tolerant quantum computation without high-overhead error correcting techniques. Our proposal relies on the prior discovery by our group that that bilayer graphene currently provides the most robust material platform in which nonabelian anyons are known to exist, including Fibonacci anyons. Our program is based on building quantum dots deep in a two dimensional sample bulk which can localize single fractionally charged anyons. Dispersive gate sensing will be used to measure this fractional charge, paving the way for double dot experiments that measure the energy difference between contrasting nonabelian fusion outcomes. Finally, multidot systems will be built that enable a complete braiding of disting nonabelian anyons—constituting the first true topological qubit incorporating initialization, a gate operation, and readout. Successful implementation of this program would result in realistic assessments of topological qubits for scaled up quantum information processing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010208
Entities
People
- Andrea Young
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California, Santa Barbara