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Controlling phonon entanglement and squeezing via one- and two-phonon interference | | Oleg V. Misochko
; Jianbo Hu
; Hiroshi Takahashi
; Kenji Ohmori
; Nobuyuki Takei
; Kazutaka G. Nakamura
; | | Date: |
9 Nov 2010 | | Abstract: | When ultrafast laser pulse strikes the crystal with a van Hove singularity in
the phonon density of states, it creates a pair of anti-correlated in wave
vector acoustic phonons. As a result, the atomic fluctuations in either
position or momentum become squeezed in such a way that their size might fall
below the vacuum level. The ultrafast pulses can also create a two-phonon bound
state in which the constituent phonons are entangled. The description of phonon
squeezing and/or entanglement requires the quantization since the phenomena
come entirely due to the grainy nature of the lattice field. Here we show that
via the interplay between one- and two-phonon interference the bound and
squeezed two-phonon state in ZnTe can be manipulated. We demonstrate that when
two paired-phonon ensembles are overlapped, the strength of phonon squeezing
and entanglement can be controlled. However, due to the complementarity of one-
and two-phonon interference a larger entanglement comes at expense of a reduced
squeezing. | | Source: | arXiv, 1011.2001 | | Services: | Forum | Review | PDF | Favorites | |
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