As recently published in Nature Communications, Federico Roy, João Henrique Romeiro Alves and others in Stefan Filipp's group at the Walther Meißner Institute have leveraged simultaneous parametric interactions to realize Perfect State Transfer (PST) between distant superconducting qubits in a chain. Their results show that for larger excitation numbers, the phase of the transferred state depends on the number of excitations in the chain. Using this property, we prepare a Greenberger–Horne–Zeilinger (GHZ) state with 88.08% fidelity in a single transfer operation, demonstrating its effectiveness for efficient entanglement generation.
A research team from Munich Quantum Valley (MQV) at the Walther Meißner Institute (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.
