Аннотация:We present an experimental platform for linear-optical quantum information processing. Our setup utilizesmultiphoton generation using a high-quality single-photon source, which is demultiplexed across multiple spatialchannels, a custom-designed, programmable, low-loss photonic chip, and paired with high-efficiency single-photondetectors. We demonstrate the platform’s capability heralded generation of arbitrary two-qubit dual-rail encodedstates, including Bell states. Bell states are an invaluable resource for boosting the fusion gates within a photonicquantum computer [Phys. Rev. Lett. 115, 020502 (2015) ], The programmable chip was fully characterized througha calibration process that allowed us to create a numerical model that accounts for fabrication imperfections andmeasurement errors. As a result, using on-chip quantum state tomography (QST), we achieved high-fidelityquantum state preparation, with a fidelity of 98.5% specifically for the Bell state postselected in the dual-rail basis.
