Group seminar at MPQ and Zoom: Resource-efficient photonic quantum computation with high-dimensional cluster states

Ohad Lib, Hebrew University of Jerusalem
Group seminar at MPQ lecture hall and Zoom
Monday, September 25, 09:00am (MEZ)

Abstract:
Photonic measurement-based quantum computation enables universal and fault-tolerant quantum computing via single qubit measurements and classical feedforward on an entangled cluster state. However, generating large cluster states at high rates is notoriously difficult, as detection probabilities drop exponentially with the number of photons comprising the state. In this talk, I will describe our approach to tackling this challenge by encoding multiple qubits per photon through high-dimensional spatial encoding. Our experiment involves controlling multiple spatial modes within the entangled state using multi-plane spatial light modulators, enabling the experimental generation of cluster states with more than 9 qubits at a rate of 100Hz.Additionally, I will demonstrate how passive and  instantaneous feedforward between qubits encoded on the same photon can be achieved, facilitating a time-efficient realization of measurement-based quantum gates.