Decoherence: Quantum Computer’s Greatest Obstacle

To understand the solution we need to know the problem.

Decoherence, Quantum Computing’s Greatest Challenge

  • Decoherence is the interactions a qubit has with its environment which causes disturbances and collapse superposition
  • Decoherence leads to errors in quantum information but there must be loose interactions of a qubit and its environment for us to read processed data
  • This introduces coherence length which is the amount of time a qubit stays in superposition long enough to do computations
  • Quantum error correction is used to detect and correct corrupted quantum information to help prolong coherence length and other faults in computation
  • Quantum gates are like classical gates in circuits except they are reversible so qubits can retain their original states (stay entangled)

Types of Quantum Computers:

How is the D-Wave Quantum Computer Built?

  1. Decoherence is one of the biggest obstacles in quantum computing
  2. Coherence length can increase while decoherence decreases with Quantum Error Correction
  3. Quantum gates need to be reversible so that qubits can stay entangled
  4. D-wave is the first Quantum Computer that uses quantum annealing algorithms and refrigeration systems to compute problems and keep qubits intact



Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store