Freiburg 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Computing and Simulation II
Q 68.5: Talk
Friday, March 15, 2024, 15:30–15:45, HS 1199
Robust quantum-network nodes through real-time noise mitigation — •Yang Wang1, 2, Sjoerd Loenen2, Barbara Terhal2,3, and Tim Taminiau2 — 13. Physikalisches Institut, ZAQuant, University of Stuttgart, Allmandring 13, 70569 Stuttgart, Germany — 2QuTech, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands — 3JARA Institute for Quantum Information, Forschungszentrum Juelich, D-52425 Juelich, Germany
The nitrogen-vacancy (NV) center in diamond and other solid-state defect centers hold great potential for constructing quantum networks. NV centers can be remotely connected through entanglement via photonic links. Furthermore, by utilizing the electronic spin of the NV center to control associated nuclear spins, a small multi-qubit register can be formed. However, reliably storing entangled states while generating new entanglement links poses a significant challenge when scaling towards large networks. In this study, we propose a method that utilizes spectator qubits to mitigate noise on stored quantum states in real time. We consider a single NV center with multiple nuclear-spin qubits, and some nuclear spins are selected as spectator qubits that are not entangled with other nuclear spins serving as data qubits. The spectator qubits are initialized in a phase-sensitive state, and measuring them after sequences of optical entanglement attempts allows us to infer the stochastic phases acquired by the data qubits without additional operations on them. The spectator qubit approach is flexible and simple, and our experiments demonstrate that spectator qubits may be a useful tool for realizing robust quantum-network nodes.
Keywords: Nitrogen-Vacancy centers in diamond; Quantum error mitigation; Quantum error correction; Quantum network