  Quantum teleportation has proven to be fundamental for many quantum
information and communication processes. The core concept can be exploited in
many tasks, from the transmission of quantum states, quantum repeaters, to
quantum computing. However, for linear-optical systems, the efficiency of
teleportation is directly linked to the success probability of the involved
Bell-state measurement. In most implementations, this is realized by linear
optics with an intrinsically limited success probability of 50%. Here, we
demonstrate quantum teleportation surpassing this limit. We achieve an average
fidelity of the teleported states of $0.8677\pm0.0024$, leading to an overall
acceptance rate of the teleportation of $69.71\pm0.75\%$. We obtain this
boosted success probability by generating ancillary photonic states that are
interfered with the Bell states. Thus, our work demonstrates the boosting
Bell-state measurements in quantum-technology applications and our scheme could
directly be applied to e.g. quantum repeaters.
