quantum decoherence tagged posts

Newfound Superconductor material could be the ‘Silicon of Quantum Computers’

A cartoon of two islands in a blue sea. Each island has mountains and explorers. At bottom are clouds and a pot of gold.
We have already found lots of superconductors, but this whimsical illustration shows why one superconductor’s newfound properties may make it especially useful. Most known superconductors are spin singlets, found on the island to the left. Uranium ditelluride, however, is a rare spin triplet, found on the island to the right, and also exists at the top of a mountain representing its unusually high resistance to magnetic fields. These properties may make it a good material for making qubits, which could maintain coherence in a quantum computer despite interference from the surrounding environment.
Credit: N. Hanacek/NIST

Possible ‘topological superconductor’ could overcome industry’s problem of quantum decoherence...

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Fast track control Accelerates Switching of Quantum Bits

Intricately-shaped pulses of light pave a speedway for the accelerated dynamics of quantum particles, enabling faster switching of a quantum bit. Credit: Image courtesy Peter Allen

Intricately-shaped pulses of light pave a speedway for the accelerated dynamics of quantum particles, enabling faster switching of a quantum bit. Credit: Image courtesy Peter Allen

Speeding up control over quantum states in atomic and nanoscale systems could lead to leaps for the emerging field of quantum technology. An international collaboration between physicists recently demonstrated a new framework for faster control of a quantum bit. Their experiments on a single electron in a diamond chip could create quantum devices that are less prone to errors when operated at high speeds.

To understand their experiment, one can look to the ultimate setting for speed in classical dynamics: the oval racetracks at the Indianapolis or Daytona 500...

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