Light-linked dots

   May 12/19, 2008
Quantum dots, which are tiny specks of semiconductor material that can hold a single electron, are promising candidates for chip-based quantum computer bits. Shining ultrashort laser pulses on a stacked pair of quantum dots provides a way of conditionally linking the dots. That is, the probability of one dot being in a higher energy state because of the laser light depends on the light-induced state of the other dot. Conditionally-linked qubits are a prerequisite for most basic quantum logic schemes. Practical quantum computers would be faster than any conventional computer for certain tasks like cracking secret codes.

Research paper:
Conditional Dynamics of Interacting Quantum Dots
Science, May 9, 2008

Researcher's homepage:
Quantum Photonics Group, ETH Zurich

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How It Works: Quantum computing: qubits


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