A superconducting quantum interference device (SQUID) is an extremely sensitive magnetic field detector. Microstrip SQUIDs can amplify weak radio frequency (RF) signals, a capability that makes them attractive as a potential alternative to the cryogenic semiconductor-based RF amplifiers that are available commercially, but at a cost of approximately $6,000 each. The challenge of using microstrip SQUIDs has been that they are static sensitive and can be overwhelmed by external noise. By tweaking microstrip SQUID design to achieve the quantum noise limit, and by packaging the technology into a more practical configuration, our team is working to reduce the cost of the SQUID approach by an order of magnitude. We also are working toward a much higher performance amplifier, with voltage noise reduced ten fold.
In the course of our work, we expect to fabricate “user-friendly” SQUIDs – packaging the RF filtering, RF-SQUID, and amplification together – such that a non-specialist could easily run the amplifier with the ease of running a conventional semiconductor amplifier. In addition to producing a practical, high-performance and economical amplifier, we believe that our work will facilitate multiple new quantum readout applications, as well as interesting fundamental physics.
Free-space Polarization-selective Microcavity based on Chiral Metasurfaces
Summary Developing a new type of Fabry-Pérot cavity that allows improved control of the atoms’ emission into the cavity mode will result in enhancement of the efficiency and fidelity of quantum state transfer from photons to atoms and back. This in turn can be used to improve the performance of quantum networks and repeaters, as […]
September 19, 2019
Quantum Light Sources Based on Deterministic Photon Subtraction
Summary This project develops new sources of light that utilize quantum entanglement to enhance imaging resolution and detection. We aim to go beyond simple photon pairs and advance our understanding and control of new quantum states of light. Our approach uses deterministic single-photon subtraction (removing of a specific photon from a pulse of light) […]
July 13, 2018
Quantum Simulations of Fundamental Interactions
Summary To address questions in modern physics such as “what is the structure of matter inside neutron stars?” we need better computational methods to evaluate the interplay of fundamental forces between elementary particles. To-date the response to such questions rests on numerical computer simulations that are inherently limited. In this project, we develop new theoretical […]
April 18, 2019
Materials for Majorana-based Topological Qubits
Summary Topological qubits offer a novel pathway to scalable quantum computing by simultaneously allowing for ease of coupling between qubits and strong decoupling of qubits from noise and dissipation. The most promising direction explores the topologically induced protection of theoretically predicted exotic quasiparticles, the so-called Majorana Zero Modes or MZMs. To-date MZMs, which follow […]
January 28, 2019