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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned...
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Encoding01:19

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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Common Ion Effect03:24

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Oscillations In An LC Circuit01:30

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Video Experimental Relacionado

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Codificación de un qubit en un oscilador mecánico de iones atrapados

C Flühmann1, T L Nguyen2, M Marinelli2

  • 1Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland. christaf@phys.ethz.ch.

Nature
|March 1, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores demuestran un nuevo método de corrección de error cuántico utilizando un solo ion atrapado. Este enfoque codifica la información cuántica en un oscilador armónico, logrando una alta fidelidad para los estados lógicos y las puertas, allanando el camino para la computación y la detección cuántica avanzadas.

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Área de la Ciencia:

  • Ciencia de la información cuántica
  • La computación cuántica
  • La detección cuántica

Sus antecedentes:

  • El funcionamiento estable de la computadora cuántica requiere una robusta corrección de errores cuánticos.
  • La corrección de error cuántico a menudo se basa en múltiples qubits físicos o sistemas de mayor dimensión como los osciladores armónicos.
  • Las propuestas anteriores para codificar qubits en osciladores armónicos han sido experimentalmente desafiantes.

Objetivo del estudio:

  • Para demostrar experimentalmente un poderoso esquema de codificación de error cuántico en un oscilador armónico.
  • Para realizar y controlar los qubits codificados utilizando un único sistema de iones atrapados.
  • Explorar aplicaciones en la corrección de errores cuánticos y la detección cuántica.

Principales métodos:

  • Utilizó un solo ión Ca+ atrapado como un oscilador armónico.
  • Empleó una superposición de estados comprimidos desplazados para la codificación de qubits.
  • Controlado y medido el oscilador mecánico a través de acoplamiento a un qubit auxiliar de estado interno.

Principales resultados:

  • Preparación y reconstrucción exitosas de estados lógicos con una fidelidad cuadrada promedio de 87,3 ± 0,7%.
  • Demostró un conjunto de puertas de un solo qubit lógico universal con altas fidelidades de proceso (aprox. 97% para las puertas de Pauli, 89% para las rotaciones continuas).
  • Lograr alta fidelidad tanto para operaciones variables discretas como continuas.

Conclusiones:

  • El método de control demostrado proporciona una ruta viable para la corrección de error cuántico variable continua.
  • Esta técnica permite esquemas híbridos de información cuántica que combinan variables discretas y continuas.
  • Los estados codificados tienen aplicaciones directas en la detección cuántica para mediciones simultáneas de posición e impulso.