QIST Research Directives
Our QIST branch of research focuses on developing quantum light-matter devices and the accompanying methodology to realize scalable quantum networks toward a Quantum Internet.
Quantum Memories
Rubidium ensemble quantum memories, known for their scalability and millisecond storage times, are a central focus of our research. We aim to extend their capabilities by demonstrating heralding through photon-photon interactions, implementing multiplexing, and integrating storage into transduction schemes monolithically.
Entanglement Sources
Our entanglement sources are based on spontaneous parametric down-conversion. Our current work is in developing sources compatible with our quantum memories. This step is crucial to developing quantum repeaters for entanglement distribution
Photonic Quantum Gates
The main goal of our CQED research is realizing photonic quantum gates via photon-photon interactions mediated by laser-cooled rubidium. Specifically, we are developing a general two-mode quantum gate providing a pathway towards photon qubit manipulation and heralding.
Quantum Frequency Conversion
Optical transduction is crucial for ensuring compatability between schemes in the D1 and D2 lines of rubidium with telecom infrastructure. This enables us to use our memories and gates for long-distance applications. Our transduction systems are realized using four-wave mixing in warm rubidium.
Microwave Transduction
We are currenty developing the methodology to make our atom-photon schemes compatible with superconducting qubit infrastructure. This involves demonstrating we can optically retrieve a microwave excitation in the ground state of rubidium via electromagnetically induced transparency. This gives a pathway towards interconnecting superconducting quantum computers over long-distances.
Quantum Sensing
Our quantum sensing efforts are two-fold. Using our multi-rail quantum memories, we aim to use concurrently stored entangled qubits to realize local magnetometry beyond the classical limit. We are also applying this concept over our long-distance network to realize much larger-scale measurments.
Quantum Network Architecture
As we are developing ever-more complicated quantum network experiments, we need a framework to guide and explain the operation of a deployed quantum network in a scalable manner. Building on classical network management principles, we have developed a layered architecture which will guide how we design and build our network across Long Island.
Quantum Tomography
Quantum tomography is the verification workhorse in a quantum network. We are developing the tools to efficiently and accurately characterize the states we send across our network, and the processes which act on those states.