Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 30: Quantum Computing and Simulation I (joint session Q/QI)
QI 30.8: Vortrag
Donnerstag, 13. März 2025, 12:45–13:00, AP-HS
Eigen-SNAP gate of two photonic qubits coupled via a transmon — •Marcus Meschede1 and Ludwig Mathey1,2,3 — 1Institut für Quantenphysik, Universität Hamburg, 22761 Hamburg, Germany — 2Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
In the pursuit of robust quantum computing, bosonic qubits encoded in cavity modes have emerged as a promising platform. Full control over single bosonic qubits can be achieved through bosonic mode displacement drives and the driving of a dispersively coupled ancilla. However, the implementation of two-qubit gates depends heavily on the specifics of the coupling between the two bosonic modes. Building on the design of the selective number-dependent phase (SNAP) gate for the single cavity system, we extend this concept to develop the eigen-SNAP gate. This gate operates on the eigenmodes of the two coupled bosonic modes. Using the eigen-SNAP gate, we implement an entangling gate on a system of two logical bosonic qubits. Further, we use numerical optimization to determine the optimal version of the entangling gate √SWAP. The fidelities of these optimal protocols are limited by the coherence times of the system’s components. The entangling gate is compatible with bosonic error-correctable encodings and is agnostic to the specific encoding within this class of logical qubits, paving the way to continuous variable quantum computing.
Keywords: Bosonic qubits; Transmon; Quantum gates; cQED; Optimization