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Related Concept Videos

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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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...
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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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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.
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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.
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Demonstrating a driven reset protocol for a superconducting qubit.

K Geerlings1, Z Leghtas2, I M Pop1

  • 1Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.

Physical Review Letters
|August 29, 2014
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Summary
This summary is machine-generated.

We demonstrate a new qubit reset technique, the double drive reset of population, achieving over 99.5% ground state fidelity in under 3 μs for superconducting qubits.

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Area of Science:

  • Quantum Information Science
  • Superconducting Quantum Computing
  • Quantum State Preparation

Background:

  • Qubit reset is essential for reliable quantum information processing.
  • Efficient ground state preparation is critical for quantum algorithms.

Purpose of the Study:

  • To experimentally demonstrate a practical qubit reset protocol.
  • To achieve high-fidelity ground state preparation in superconducting qubits.

Main Methods:

  • Implementing a 'double drive reset of population' protocol.
  • Utilizing specific qubit and cavity transitions for population transfer.
  • Testing on a superconducting transmon qubit in a 3D cavity.
  • Employing a novel population measurement technique.

Main Results:

  • Achieved ground state preparation fidelity of at least 99.5%.
  • Demonstrated qubit reset in less than 3 microseconds.
  • Validated the effectiveness of the double drive reset protocol.

Conclusions:

  • The double drive reset protocol is a viable method for rapid and high-fidelity qubit reset.
  • Further parameter optimization is expected to yield even faster reset times and higher fidelities.
  • This technique is crucial for advancing the performance of quantum information algorithms.