Baseband Control over Superconducting Qubits
Abstract
We have developed a new class of qubits, known as the Òheavy fluxonium,Ó which has very low transition frequencies from 1 Ð 100 MHz depending on device parameters. We are requesting equipment to develop a new type of control protocol which would directly manipulate these transitions, using fast flux pulses that are not subject to the rotating wave approximation, and therefore can operate directly at the qubit transition frequency. With these techniques we will have qubits that live longer than conventional superconducting qubits, but which can be operated as fast or faster. We are requesting funds to purchase a modular FPGA-based data acquisition system that will enable us to directly operate these qubits without microwaves, and perform real-time feedback for active reset and future applications in quantum error correction / communication. The baseband equipment once integrated will be significantly less complex (because it eliminates microwaves) and cheaper to operate. It will also potentially enable simpler denser cryogenic wiring, also crucial to scaling to larger qubit numbers. The new qubit design and protocols are drop-in replaceable to current commercial/government efforts to scale up superconducting quantum computers and offer a very attractive option for how to improve coherence while also enabling qubits to be controlled more easily.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 09, 2020
- Source ID
- W911NF2010177
Entities
People
- David Schuster
Organizations
- Army Contracting Command
- United States Army
- University of Chicago