Quantum monodromy in NCNCS – direct experimental confirmation

Abstract

Since the first confirmation of quantum monodromy in NCNCS (B. P. Winnewisser et al., Report No. TH07 in 60th International Symposium on Molecular Spectroscopy, Columbus, OH, (2005) and B. P....

Simulating Chemistry on Bosonic Quantum Devices

“…The best known cases are the bending vibration in the water molecule 45,46 and the ν 7 bending mode of cyanogen iso-thiocyanate (NCNCS). 47,48 A successful approach to understanding the complex vibrational spectra of nonrigid molecules consists of approximating their energy potential function as discussed in ref 49. When the excitation energy reaches the local maximum at the origin of the potential, the nature of the vibration switches from bent to linear, and complex features arise in the spectrum.…”

“…For example, such large amplitude modes are described by complicated potentials that have at least two minima. The best known cases are the bending vibration in the water molecule , and the ν 7 bending mode of cyanogen iso-thiocyanate (NCNCS). , …”

“…There are numerous systems that exhibit an ESQPT and the first experimental detection of such transition was done in molecules. − ,− Recently, it has been argued that the superconducting circuit used to generate an anharmonic resonator offers an excellent platform to analyze the spectra of nonrigid molecules and ESQPTs in general. This is because the static effective Hamiltonian of the driven anharmonic resonator, Ĥ q u ℏ K = n̂ ( n̂ − 1 ) − ξ ( â † 2 + â 2 ) describes a double-well metapotential that captures the ESQPT.…”