Physics Colloquium

Quantum Interconnects and Modularity via Waveguide QED

In this talk, we present a demonstration of entanglement distribution via directional photon emission and absorption along a waveguide [1,2]. Superconducting qubits couple to the waveguide at multiple, well-separated locations through modules that deterministically emit and absorb single microwave photons. Using this architecture, we demonstrate directional single-photon emission with 96% fidelity and single-photon absorption exceeding 60% efficiency. We then use partial emission and absorption to generate remote entanglement – a four-qubit W-state – between qubits in the emitter and absorber modules with 62% fidelity. Time permitting, we also present an example of driven dissipative entanglement reaching 89% fidelity [3]. These works along with 3D integration target modular and extensible quantum information processing mediated by quantum interconnects.

Join via Zoom:
https://caltech.zoom.us/j/84497014003
Meeting ID: 844 9701 4003

The colloquium is held in Feynman Lecture Hall, 201 E. Bridge.