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Related Concept Videos

Chemical Bonds02:40

Chemical Bonds

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Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.5K
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...
1.5K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.4K
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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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Binding potentials and interaction gates between microwave-dressed Rydberg atoms.

David Petrosyan1, Klaus Mølmer2

  • 1Aarhus Institute of Advanced Studies, Aarhus University, DK-8000 Aarhus C, Denmark and Institute of Electronic Structure and Laser, FORTH, GR-71110 Heraklion, Crete, Greece.

Physical Review Letters
|October 4, 2014
PubMed
Summary
This summary is machine-generated.

We demonstrate novel Rydberg atom interactions using microwave fields to create a two-qubit gate. This method is immune to motional decoherence, enabling robust quantum computations.

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Area of Science:

  • Atomic physics
  • Quantum computing
  • Quantum optics

Background:

  • Rydberg atoms are highly excited atoms with unique properties.
  • Controlling interactions between Rydberg atoms is crucial for quantum information processing.
  • Existing methods for Rydberg atom control can be susceptible to environmental noise.

Purpose of the Study:

  • To demonstrate finite-range binding potentials between Rydberg atoms.
  • To achieve selective and coherent population of Rydberg-dimer states.
  • To realize a two-qubit interaction gate immune to motional decoherence.

Main Methods:

  • Utilizing attractive and repulsive van der Waals potentials between Rydberg atoms.
  • Employing microwave field driving for atom excitation.
  • Applying destructive quantum interference to cancel single-atom Rydberg excitation.

Main Results:

  • Demonstrated finite-range binding potentials between pairs of Rydberg atoms.
  • Achieved selective and coherent population of Rydberg-dimer states from the two-atom ground state.
  • Developed a two-qubit interaction gate resilient to mechanical forces and motional decoherence.

Conclusions:

  • The proposed method enables robust quantum gates by mitigating motional decoherence.
  • Selective population of Rydberg-dimer states offers a new pathway for quantum control.
  • This work advances the development of scalable and fault-tolerant quantum computers.