20.03.2025
17:45
HIT H42
20.03.2025
17:45
HIT H42
Alonso Hernández-Antón
PhD Student at the Quantum Device Lab in ETH
Abstract
Multipartite entangled states are a key resource for robust quantum communication, measurement-based quantum computing and quantum metrology. We present device capable of emitting large-scale entangled microwave photonic states with a two dimensional entanglement structure.
The device consists of a pair of coupled superconducting transmon qubits which are each tuneably coupled to a common output waveguide. This architecture permits entanglement between each transmon and a deterministically emitted photonic qubit. By interleaving two-qubit gates with controlled photon emission, we generate 2 x n grids of time- and frequency-multiplexed cluster states of itinerant microwave photons. We measure a signature of localizable entanglement across up to 16 photonic qubits. We expect this device architecture to be capable of generating a wide range of other tensor network states such as tree graph states, repeater states or the ground state of the toric code, and to be readily scalable to generate larger and higher dimensional states.
In this talk I will present the architecture, the methods used for the calibration of the device and the generation and analysis of microwave photonic states and the results obtained, and will discuss the prospective applications of this technology to the field of quantum communication.