Continuous variable quantum key distribution

    Quantum key distribution enables the generation of an unconditional secure secret key between two legitimate parties. When combined with one time pad, one can achieve private communication with unconditional security. Continuous variable quantum key distribution utilizes the quadratures of the quantized light field as the carriers of key information. The key feature is that single-photon-detection can be replaced by the homodyne detection techniques which are compatible to standard telecommunication technology.

 

Cavity quantum optomechanics

    Quantum optomechanics, which investigates the interaction between micro/nano mechanical resonators and light field via radiation pressure, has emerged as a new frontier in quantum optics. Cavity quantum optomechanics combines micro resonators with high fineness cavities, in this case the opto-mechanical interaction can be enhanced significantly. It has potential applications in the fields of fundamental tests of macroscopic quantum physics, ultrasensitive quantum metrology, and quantum information processing, etc.

 

Quantum state engineering and manipulation

    Entanglement is a unique quantum phenomenon that occurs when each subsystem of a quantum state cannot be described independently of the others. Such kind of states have been widely employed as important resources for quantum information processing, such as quantum communication, quantum computing, and quantum metrology. Quantum interface capable of transferring quantum states between different carrier frequencies is a necessary component for quantum information processing. Such quantum-state-preserving frequency conversion enables seamless connection of quantum devices that operate at different carrier frequencies.

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