Time-Bin Entanglement Between Remote Superconducting Cavities

Generation of entanglement between qubits connected by a lossy channel is an important primitive for large scale quantum information processing. Time-bin entanglement allows one to counter this imperfection through detection of photon loss errors in the channel. We present an experiment for time-bin entanglement between remote superconducting cavities. Stimulating a particular three-body Raman transition performs an entangling gate between a flying photon, target system, and an ancillary mode used as an entanglement witness. This ancillary mode, equivalent to a photon detector, is used to herald success of the protocol. The success rate of this protocol is expected to reach the transmission of the channel. Through local measurement of the ancillary modes, we can detect photon loss errors in the channel and herald the creation of an entangled Fock state between the remote cavities. We discuss experimental progress towards the implementation of this protocol.