Remote entanglement of trapped ions using time bin encoded photons

Trapped ions are one of the leading platforms for quantum computing and quantum communication. They naturally emit photons, thus providing an interface with spatially separated ion trap quantum nodes. Various degrees of freedom of photons can be used to generate entanglement, such as polarization, time bins, angular momentum, frequency etc. Polarization-based encoding has been used in previous works for high-rate entanglement generation between ion traps, but fidelity has always been limited by polarization errors. Photonic time bin qubits are a good candidate for networking because of their intrinsic insensitivity to polarization errors, especially when travelling through fiber. Here, we report our progress towards entangling two remote trapped ion qubits via time encoded photons. We analyze the fidelity of our resulting entangled state and compare it with the fidelity from our polarization qubit entanglement counterparts.