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Report No.

Quantum proton entanglement on a nanocrystalline silicon surface

Matsumoto, Takahiro*; Sugimoto, Hidehiko*; Ohara, Takashi   ; Tokumitsu, Akio*; Tomita, Makoto*; Ikeda, Susumu*

We investigate the quantum entangled state of two protons terminating on a silicon surface. The entangled states were detected using the surface vibrational dynamics of nanocrystalline silicon with inelastic neutron scattering spectroscopy. The protons are identical, therefore the harmonic oscillator parity constrains the spin degrees of freedom, forming strongly entangled states for all the energy levels of surface vibrations. Compared to the proton entanglement previously observed in hydrogen molecules, this entanglement is characterized by an enormous energy difference of 113 meV between the spin singlet ground state and the spin triplet excited state. We theoretically demonstrate the cascade transition of terahertz entangled photon pairs utilizing proton entanglement.



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Category:Materials Science, Multidisciplinary



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