The essence of Young's double-slit experiment performed in the early 19th century is the quantum superposition resulting in indistinguishability between two paths. This coherence optics of Young's double slit has been expanded to incoherence optics of spatial/temporal correlations such as HBT and HOM via two distinct intensity measurements. Modern (classical) technologies for computing and cryptography are based on the Turing machine and computational complexity, where Moore's law has been ended and unconditional security is intrinsically impossible. This may cause severe problems of speed-up and security in the future AI-based technologies such as unmanned vehicles and drones. Over the last several decades, quantum physics has been applied for future technologies such as Quantum computing, Quantum cryptography, and Quantum sensing, which are impossible with modern classical physics. The heart of quantum physics is in the Schrodinger's uncertainty principle, quantum superposition, and quantum entanglement. Especially quantum superposition in Young's double slit-like experiments reveals not only indistinguishability but also indefinite causal order which may affect the causality defined by the Einstein's special relativity. On the other hand, quantum coherence control between light and matter has been the heart of quantum interface for quantum processing such as quantum gating, entanglement swapping, and quantum memories. The PIP center at GIST has led international science in the field of nonlinear quantum optics for ultralong quantum memories applicable to quantum repeaters and scalable quantum computing. By the way, the recent discovery of the Photon Key Distribution (PKD) at the PIP center is the gift of revisiting Young's double slits. Unlike most quantum cryptography suffering from detection loophole and nonclassical light usage, PKD is based on coherence optics and thus intrinsically detection loophole-free. Most of all, PKD is compatible with current optical systems. The followings are examples of potential research topics at the PIP center currently on-going or planned in the future: 


Research Topics:

1.     Quantum memory: Optical locking, CASE, Controlled echo

2.     Quantum interface: Quantum repeaters for long-distance quantum communications

3.     Quantum key distribution: Unconditionally secured cryptography

4.     Coherence interface: Base-station for wireless and wired freq conversion

5.     Photon machine learning: Photon MIMO and photon AI

6.     All-optical information processing: Associative memory, DRAM

7.     Quantum Theranostics: in-situ, real-time quantum optical diagnostics and direct therapy



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