Non-Reciprocal Circuit-QED Devices using Synthetic Band Topology
Abstract
Circulators and isolators are simultaneously one of the most important enabling technologies for superconducting-qubit devices and one of the primary bottlenecks to scalability in this quantum computing architecture. Every single readout system for superconducting qubits needs them. Currently, the most commonly used circulator-isolator devices require strong magnetic biasing, necessitating bulky shielding and separate packaging to protect the delicate qubits. As a result, when compared to the planar microfabricated superconducting quantum devices that they support, these circulators-isolators occupy vastly greater volume and present a major scaling challenge. They also exhibit unavoidable insertion losses, due to the need for signals to go between different modules, which limit the performance of the readout system. Alternative approaches have been attempted, but so far, each technology has had significant drawbacks, and the search for a magnet-less alternative technology with good ease of use and high performance specifications remains ongoing. In this project, we will investigate a promising potential technology based on strong-periodic driving. In certain regimes, these systems exhibit analogs of the quantum Hall effect in a synthetic space. As a result, they exhibit non-reciprocal energy transport which is protected by topological invariants of the system and therefore robust to minor variations in the control parameters. This natural immunity has the potential to yield highly stable devices which do not require fine tuning, a problem which has plagued previous actively-driven implementations. However, devices operating in this driven topological regime have not yet been explored in the regime of small quantum- mechanical signals. The goal of the proposed work is to produce prototype devices that operate in this regime using superconducting circuits. If successful, this project will establish driven systems as a new building block for quantum circulators and isolators.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410121
Entities
People
- Alicia Kollar
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Maryland