Event Details

The heart of Copenhagen interpretation is Heisenberg's uncertainty principle and its application to nonlocal correlation beyond the local realism. This nonlocal correlation has become the basis of quantum information processing, where it cannot be achieved by a classical manner. The direct proof of the nonlocal correlation is the anticorrelation on a beam splitter between two photons, resulting in a HOM dip

1. The HOM dip has been tested intensively over the last three decades mostly for the particle nature of light. Here, the origin of this anticorrelation is presented in a coherence optics manner of the wave nature, where a particular phase relation between two input photons is a prerequisite of the nonlocal correlation

2. Based on this specific phase relation, a general scheme of the anticorrelation has also been found as a typical Mach Zehnder interferometer. For a potential application of the coherence optics-based anticorrelation, a new scheme of unconditionally secured cryptography is presented without limitations of nonclassicality, transmission distance, and quantum loopholes

3. More interestingly this unconditionally secured cryptography is compatible with current fiber-optic communications. As a result, the one-time-pad cryptography may be implemented in current fiber-optic backbone networks.

Articles

- C. K. Hong, Z. Y. Ou, and L. Mandel, Measurement of subpicosecond time intervals between two photons by interference. Phys. Rev. Lett. 59, 2044-2046 (1987).
- Ham, B. S. The origin of anticorrelation for photon bunching on a beam-splitter, arXiv:1911.07174 v2 (2019)
- Ham, B. S. Unconditionally secured classical cryptography using quantum superposition and unitary transformation, arXiv:1807.04233 v3 (2018) (2018).