Jean-Claude Besse

Last Name

Besse

First Name

Jean-Claude

ORCID

0000-0002-1490-0072

Organisational unit

03720 - Wallraff, Andreas / Wallraff, Andreas

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Publications 1 - 10 of 30

Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions
Collodo, Michele C.; Herrmann, Johannes; Lacroix, Nathan; et al. (2020)
Physical Review Letters
High fidelity two-qubit gates exhibiting low cross talk are essential building blocks for gate-based quantum information processing. In superconducting circuits, two-qubit gates are typically based either on rf-controlled interactions or on the in situ tunability of qubit frequencies. Here, we present an alternative approach using a tunable cross-Kerr-type ZZ interaction between two qubits, which we realize with a flux-tunable coupler element. We control the ZZ-coupling rate over 3 orders of magnitude to perform a rapid (38 ns), high-contrast, low leakage (0.14±0.24%) conditional phase CZ gate with a fidelity of 97.9±0.7% as measured in interleaved randomized benchmarking without relying on the resonant interaction with a noncomputational state. Furthermore, by exploiting the direct nature of the ZZ coupling, we easily access the entire conditional phase gate family by adjusting only a single control parameter. © 2020 American Physical Society
Rapid high-fidelity multiplexed readout of superconducting Qubits
Heinsoo, Johannes; Andersen, Christian Kraglund; Remm, Ants; et al. (2018)
Physical Review Applied
Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
Krinner, Sebastian; Kurpiers, Philipp; Royer, Baptiste; et al. (2020)
arXiv
Realizing a deep reinforcement learning agent for real-time quantum feedback
Reuer, Kevin; Landgraf, Jonas; Fösel, Thomas; et al. (2023)
Nature Communications
Realizing the full potential of quantum technologies requires precise real-time control on time scales much shorter than the coherence time. Model-free reinforcement learning promises to discover efficient feedback strategies from scratch without relying on a description of the quantum system. However, developing and training a reinforcement learning agent able to operate in real-time using feedback has been an open challenge. Here, we have implemented such an agent for a single qubit as a sub-microsecond-latency neural network on a field-programmable gate array (FPGA). We demonstrate its use to efficiently initialize a superconducting qubit and train the agent based solely on measurements. Our work is a first step towards adoption of reinforcement learning for the control of quantum devices and more generally any physical device requiring low-latency feedback.
Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators
Collodo, Michele C.; Potočnik, Anton; Gasparinetti, Simone; et al. (2019)
Physical Review Letters
Deterministic quantum state transfer and remote entanglement using microwave photons
Kurpiers, Philipp; Magnard, Paul; Walter, Theo; et al. (2018)
Nature
Realizing a deterministic source of multipartite-entangled photonic qubits
Besse, Jean-Claude; Reuer, Kevin; Collodo, Michele C.; et al. (2020)
Nature Communications
Sources of entangled electromagnetic radiation are a cornerstone in quantum information processing and offer unique opportunities for the study of quantum many-body physics in a controlled experimental setting. Generation of multi-mode entangled states of radiation with a large entanglement length, that is neither probabilistic nor restricted to generate specific types of states, remains challenging. Here, we demonstrate the fully deterministic generation of purely photonic entangled states such as the cluster, GHZ, and W state by sequentially emitting microwave photons from a controlled auxiliary system into a waveguide. We tomographically reconstruct the entire quantum many-body state for up to N = 4 photonic modes and infer the quantum state for even larger N from process tomography. We estimate that localizable entanglement persists over a distance of approximately ten photonic qubits.
Superconducting Switch for Fast On-Chip Routing of Quantum Microwave Fields
Pechal, M.; Besse, Jean-Claude; Mondal, M.; et al. (2016)
Physical Review Applied
Two-photon resonance fluorescence of a ladder-type atomic system
Gasparinetti, Simone; Besse, Jean-Claude; Pechal, Marek; et al. (2019)
Physical Review A
Correlations and Entanglement of Microwave Photons Emitted in a Cascade Decay
Gasparinetti, Simone; Pechal, Marek; Besse, Jean-Claude; et al. (2017)
Physical Review Letters

Publications 1 - 10 of 30

Jean-Claude Besse

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