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Related Concept Videos

Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

2.0K
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.
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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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.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Enhanced quantum interface with collective ion-cavity coupling.

B Casabone1, K Friebe1, B Brandstätter1

  • 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.

Physical Review Letters
|January 31, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created a two-ion entangled state coupled to an optical cavity, controlling photon emission from sub- to superradiant regimes. This superradiant state enhances quantum information transfer to a photon.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • Entangled states of ions are crucial for quantum information processing.
  • Controlling light-matter interactions in optical cavities is key for efficient quantum information transfer.

Purpose of the Study:

  • To prepare and control a two-ion entangled state coupled to an optical cavity.
  • To investigate the transition from subradiance to superradiance by tuning the entangled state phase.
  • To demonstrate enhanced quantum information transfer using a superradiant two-ion state.

Main Methods:

  • Preparation of a maximally entangled state of two ions.
  • Coupling both ions to the mode of an optical cavity.
  • Tuning the phase of the entangled state to control collective ion-cavity interaction.
  • Encoding a single qubit in the two-ion superradiant state.

Main Results:

  • Demonstrated control over collective ion-cavity interaction, enabling a transition from subradiance to superradiance.
  • Showcased suppression and enhancement of single photon emission into the cavity.
  • Achieved enhanced transfer of quantum information onto a photon using the superradiant state.

Conclusions:

  • The phase of an entangled ion state dictates collective interaction with an optical cavity.
  • Superradiance in a two-ion system significantly enhances quantum information transfer to a photon.
  • This work provides a pathway for improved quantum communication protocols.