Unconditional Accumulation of Nonclassicality in a Single-Atom Mechanical Oscillator

0536028 - ÚPT 2021 RIV US eng J - Journal Article
Podhora, L. - Pham, Minh Tuan - Lešundák, Adam - Obšil, P. - Čížek, Martin - Číp, Ondřej - Marek, P. - Slodička, L. - Filip, R.
Unconditional Accumulation of Nonclassicality in a Single-Atom Mechanical Oscillator.
Advanced Quantum Technologies. Roč. 3, č. 11 (2020), č. článku 2000012. E-ISSN 2511-9044
R&D Projects: GA ČR(CZ) GA19-14988S; GA MŠMT(CZ) EF16_026/0008460
Institutional support: RVO:68081731
Keywords : nonclassical states * nonlinear quantum dynamics * quantum non-Gaussianity * trapped ions
OECD category: Optics (including laser optics and quantum optics)
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/epdf/10.1002/qute.202000012

The robust experimental accumulation of nonclassicality of motion of a single trapped ion is reported. The nonclassicality stems from deterministic incoherent modulation of thermal phonon number distribution implemented by a laser excitation of nonlinear coupling between the ion's internal-electronic levels and external-motional states. It is demonstrated that the repetitive application of this nonlinear process monotonically accumulates the observable state nonclassicality. The output states converge to a phonon number distribution with high overlap with a particular Fock state and visible quantum non-Gaussian aspects including corresponding negative Wigner function. The resulting oscillator states prove deterministic transition in the hierarchy of quantum non-Gaussianity up to four phonons. This transition is very robust against experimental imperfections and produces increasing entanglement potential.
Permanent Link: http://hdl.handle.net/11104/0313877