Related Experiment Video
Updated: Mar 24, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.8K
Fast generation of three-atom singlet state by transitionless quantum driving
Zhen Chen1, Ye-Hong Chen1, Yan Xia1
1Department of Physics, Fuzhou University, Fuzhou 350002, China.
Scientific Reports
|March 3, 2016
Summary
We developed a fast and robust method using quantum Zeno dynamics and lasers to create singlet states in three-atom systems. This technique shows resilience against decoherence and experimental errors.
Area of Science:
- Quantum physics
- Atomic physics
- Quantum information science
Background:
- Adiabatic passage is a key technique for preparing quantum states.
- Shortcuts to adiabatic passage aim to speed up state preparation.
- Controlling multi-atom systems is crucial for quantum technologies.
Purpose of the Study:
- To construct shortcuts to adiabatic passage in a three-atom system.
- To create a specific quantum state (singlet state).
- To investigate robustness against decoherence and experimental imperfections.
Main Methods:
- Utilized quantum Zeno dynamics.
- Employed non-resonant lasers.
- Performed numerical simulations to analyze decoherence effects.
- Investigated experimental parameter control for cavity dissipation and atomic spontaneous emission.
Main Results:
- Successfully constructed shortcuts to adiabatic passage for singlet state creation.
- Demonstrated the scheme's speed and robustness against decoherence.
- Identified methods to control experimental parameters like cavity dissipation and atomic spontaneous emission.
Conclusions:
- The proposed scheme offers a fast and robust method for generating singlet states in three-atom systems.
- The findings have potential applications in experimental quantum control.
- The study provides insights into managing decoherence in quantum systems.
Related Concept Videos
01:25Deactivation Processes: Jablonski Diagram
2.2K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
2.2K
01:22Carrier Generation and Recombination
1.5K
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
1.5K
01:03Atomic Nuclei: Nuclear Spin State Overview
2.2K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.2K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.9K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.9K
02:45The Quantum-Mechanical Model of an Atom
61.5K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
61.5K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.7K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.7K