Quantum-Network Nodes with Real-Time Noise Mitigation Using Spectator Qubits
S. J.H. Loenen (TU Delft - BUS/Quantum Delft, Kavli institute of nanoscience Delft, TU Delft - Qutech QIA)
Y. Wang (University of Stuttgart, TU Delft - Qutech QIA)
N. Demetriou (TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft, TU Delft - Qutech QIA)
C. E. Bradley (TU Delft - Qutech QIA, TU Delft - QID/Taminiau Lab)
T. H. Taminiau (Kavli institute of nanoscience Delft, TU Delft - Quantum Internet Division, TU Delft - Qutech QIA)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Quantum networks might enable quantum communication and distributed quantum computation. Solid-state defects are promising platforms for such networks, because they provide an optical interface for remote entanglement distribution and a nuclear-spin register to store and process quantum information. A key challenge toward larger networks is to improve the storage of previously generated entangled states during new entanglement generation. Here, we introduce a method that uses “spectator” qubits combined with real-time decision making and feedforward to mitigate dephasing of stored quantum states during remote entanglement sequences. We implement the protocol using a single nitrogen-vacancy (NV) center in diamond and demonstrate improved memory fidelity. Our results show that spectator qubits can improve quantum network memory using minimal overhead and naturally present resources, making them a promising addition for near-term testbeds for quantum networks.
help_outline