Related Experiment Video
Updated: Jun 6, 2026
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Quantum stochastic resonance in parity violating chiral molecules
Pedro Bargueño1, Salvador Miret-Artés, Isabel Gonzalo
1Instituto de Física Fundamental (CSIC), Serrano 123, 28006 Madrid, Spain. pbdr@iff.csic.es
Physical Chemistry Chemical Physics : PCCP
|November 11, 2010
Summary
Quantum stochastic resonance (QSR) in chiral molecules reveals parity violating energy differences (PVED). This effect, crucial for homochirality, is observable in ultracold conditions, independent of tunneling.
Area of Science:
- Quantum Chemistry
- Molecular Physics
- Chirality Studies
Background:
- Chiral molecules exhibit enantiomers, differing in spatial arrangement.
- Parity violating energy difference (PVED) is a subtle quantum effect in chiral molecules.
- Understanding PVED is relevant to theories of homochirality evolution.
Purpose of the Study:
- Investigate quantum stochastic resonance (QSR) in chiral molecules.
- Explore the influence of PVED on QSR and optical activity.
- Determine conditions for observing QSR in the deep quantum regime.
Main Methods:
- Utilized a two-state model for chiral molecules in an asymmetric double-well potential.
- Simulated low viscous friction and deep quantum regime conditions.
- Analyzed linear response to an external driving field modulating potential minima.
Main Results:
- QSR signal predicted only when PVED is non-zero.
- Resonance condition for QSR is independent of inter-enantiomer tunneling.
- Fluctuations of the first-order internal energy contribution are zero at resonance.
- Observed resonance occurs in the ultracold regime due to small PVED values.
Conclusions:
- QSR can serve as a sensitive probe for detecting PVED in chiral systems.
- The study highlights the potential for observing parity violation effects in molecular systems.
- Experimental observation of QSR in chiral molecules requires ultracold temperatures.
Related Concept Videos
02:30Chirality in Nature
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
03:06The Pauli Exclusion Principle
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...