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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

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...

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Published on: August 17, 2017

Crosstalk Insensitive Trapped-Ion Entanglement through Coupling Matrix Engineering.

Vikram Kashyap1,2,3, Caleb Walton3, Sara Mouradian3

  • 1University of Maryland, Joint Center for Quantum Information and Computer Science, NIST/, College Park, Maryland 20742, USA.

Physical Review Letters
|July 10, 2026
PubMed
Summary

We developed a new method to design quantum entanglement gates for trapped ions that are insensitive to optical crosstalk. This approach engineers the qubit coupling matrix to prevent unwanted entanglement with neighboring ions.

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Last Updated: Jul 12, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Trapped-ion quantum computers utilize entangling gates to perform computations.
  • Optical crosstalk in these gates leads to unwanted entanglement between ions, degrading performance.
  • Standard quantum error correction struggles to mitigate this crosstalk effectively.

Purpose of the Study:

  • To develop a novel method for designing crosstalk-insensitive entangling gates in trapped-ion systems.
  • To engineer qubit-qubit coupling matrices that inherently avoid crosstalk errors.
  • To provide a practical solution for improving the fidelity of trapped-ion quantum operations.

Main Methods:

  • Engineering the effective qubit-qubit coupling matrix by controlling geometric phases in ion string motional modes.
  • Designing entangling operations that selectively exclude coupling between target and neighboring ions.
  • Numerical simulations for a 20-ion string and experimental validation in a 3-ion system.

Main Results:

  • Demonstrated a method to create entangling gates immune to optical crosstalk without prior knowledge of crosstalk levels.
  • Successfully engineered coupling matrices that prevent unwanted nonlocal entanglement.
  • Experimental validation confirmed the effectiveness of the coupling matrix engineering approach.

Conclusions:

  • The proposed method offers a robust way to achieve high-fidelity entanglement in trapped-ion systems.
  • This technique bypasses the need for additional gate operations or optical setup modifications.
  • It represents a significant advancement in building scalable and reliable trapped-ion quantum computers.