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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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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...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.0K
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...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Ultrafast superconducting qubit readout with the quarton coupler.

Yufeng Ye1,2, Jeremy B Kline1,2, Sean Chen1,2

  • 1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science Advances
|October 9, 2024
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Summary
This summary is machine-generated.

We developed a new superconducting qubit readout method using a quarton coupler. This enables faster, high-fidelity quantum nondemolition (QND) qubit measurements in just 5 nanoseconds.

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Area of Science:

  • Quantum Information Science
  • Superconducting Quantum Computing

Background:

  • Fast, high-fidelity, and quantum nondemolition (QND) qubit readout is critical for quantum information processing.
  • Current superconducting qubit readout methods, limited by dispersive cross-Kerr coupling, achieve ~50 ns readout times.

Purpose of the Study:

  • To present a novel readout scheme for superconducting qubits that significantly reduces readout time while maintaining high fidelity.
  • To demonstrate the feasibility of achieving order-of-magnitude improvements in qubit readout speed.

Main Methods:

  • Utilized a quarton coupler to engineer a large cross-Kerr coupling (>200 MHz) between a transmon qubit and its readout resonator.
  • Performed full master equation simulations of the coupled system to analyze performance.

Main Results:

  • Simulations predict a readout time of 5 nanoseconds.
  • Achieved simulated readout fidelity >99% and QND fidelity >99.9%.
  • The proposed quartonic readout circuit is experimentally feasible and preserves qubit coherence.

Conclusions:

  • The quarton coupler enables significantly faster and higher-fidelity superconducting qubit readout.
  • This work presents a promising pathway for substantial advancements in quantum computing hardware.