31 March 2025

Parity-dependent state transfer for direct entanglement generation

A team of researchers from the Walther-Meißner-Institute of the Bavarian Academy of Sciences (WMI) has implemented Perfect State Transfer on a chain of six superconducting qubits and demonstrated its usefulness in efficiently connecting distant qubits and generating multi-qubit entanglement.

The toolsets for building quantum computers continue to expand. Federico Roy, João Henrique Romeiro Alves et al. of the group of Stefan Filipp at the Walther-Meißner-Institute have leveraged simultaneous parametric interactions to realise Perfect State Transfer between distant superconducting qubits in a chain. The team's results reveal that for larger excitation numbers, the phase of the transferred state depends on the number of excitations in the chain. Using this property, they are now preparing a GHZ state with 88.08% fidelity in a single transfer operation, demonstrating its effectiveness for efficient entanglement generation.

The results have been published in Nature Communications.

Publication

Parity-dependent state transfer for direct entanglement generation
Roy, F.A., Romeiro, J.H., Koch, L. et al. .
Nat Commun 16, 2660 (2025).
https://doi.org/10.1038/s41467-025-57818-2