Bonn 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

QI: Fachverband Quanteninformation

QI 30: Quantum Computing and Simulation I (joint session Q/QI)

QI 30.2: Talk

Thursday, March 13, 2025, 11:15–11:30, AP-HS

Photonic Qubit Z-Gate Scheme from Scattering with Atomic Vapors in a 1D Waveguide Slot — •Evangelos Varvelis and Joachim Ankerhold — Institute for complex quantum systems, University of Ulm

Photonic quantum computing offers a promising platform for quantum information processing, benefiting from the long coherence times of photons and their ease of manipulation. This paper presents a scheme for implementing a deterministic Z-gate for frequency-encoded photonic qubits, leveraging a silicon slot waveguide filled with thermal rubidium vapor. This system enhances atom-photon interactions via the Purcell effect, allowing dynamic control of nonlinearity at the few-photon level while operating efficiently at room temperature. Using a transfer matrix approach, we develop a protocol for Z-gate operation, demonstrating its robustness against non-waveguide mode coupling and disorder. Finally, we will relax the idealized assumption of monochromatic light in favor of finite bandwidth pulses. Despite these realistic considerations, our results indicate high fidelity for the proposed Z-gate.

Keywords: Photonic Qubits; Frequency Encoding; Quantum Gates; Atomic Vapors; Quantum Information