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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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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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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the...
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Adiabatic Processes for an Ideal Gas01:18

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When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Computación cuántica adiabática digitalizada con un circuito superconductor

R Barends1, A Shabani2, L Lamata3

  • 1Google Inc., Santa Barbara, California 93117, USA.

Nature
|June 10, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron computación cuántica adiabática digitalizada en sistemas superconductores. Este enfoque híbrido combina las fortalezas de la computación cuántica adiabática y digital para resolver problemas complejos de física y química.

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Área de la Ciencia:

  • La computación cuántica
  • Física del estado sólido
  • Química computacional

Sus antecedentes:

  • La computación cuántica adiabática ofrece resolución de problemas generales, pero se enfrenta a limitaciones de hardware como el ruido y la conectividad.
  • La computación cuántica digital proporciona flexibilidad y corrección de errores, pero utiliza algoritmos específicos para cada problema.

Objetivo del estudio:

  • Combinar las ventajas de la computación cuántica adiabática y digital.
  • Implementar un enfoque híbrido llamado computación cuántica adiabática digitalizada.
  • Para demostrar sus capacidades en un sistema superconductor.

Principales métodos:

  • Implementó computación cuántica adiabática digitalizada en una plataforma superconductora.
  • Utilizado hasta nueve qubits y 1.000 puertas de lógica cuántica.
  • Realizó sondeos tomográficos durante la evolución digitalizada y analizó la escala de errores.

Principales resultados:

  • Simulado con éxito el algoritmo adiabático utilizando un enfoque digital.
  • Ejemplos resueltos del problema de Ising unidimensional y las interacciones complejas hamiltonianas.
  • Demostró la viabilidad de la computación cuántica adiabática digitalizada en un sistema de estado sólido.

Conclusiones:

  • La computación cuántica adiabática digitalizada cierra la brecha entre la aplicabilidad general y las restricciones de hardware.
  • Este enfoque permite la síntesis de correlaciones de largo alcance y la solución de problemas computacionales complejos.
  • La integración con la tolerancia a fallos promete un algoritmo cuántico escalable y de uso general.