Quantum teleportation means to transfer an unknown quantum state from one station to another over certain distance with the help of nonlocal Einstein-Podolsky-Rosen entangled state shared by sender and receiver. Here, we experimentally realize deterministic quantum teleportation of an optical coherent state through 6.0 kilometer fiber fiber-channel. The fidelity of 0.62±0.03 is achieved for the retrieved quantum state, which breaks through the classical limit of 1/2. A fidelity of 0.69±0.03 breaking through the no-cloning limit of 2/3 has also been achieved when the transmission distance is 2.0 kilometers. Our work provides a feasible scheme to implement deterministic quantum teleportation in communication networks.
Squeezed state light field can surpass the shot noise limit and improve the signal-to-noise ratio of the sensor measurement. In this paper, based on optical parametric amplification (OPA), we present employed a semi-monolithic cavity and miniaturization design of optical parametric amplifier (OPA) to improve system stability. The infrared spectrum 1064nm quadrature squeezed state field of noise squeezing degree 6.75dB is obtained by pumped the PPKTP crystal via 532nm laser. This work provides a practical light source for quantum sensing detection.