Friday, September 28, 2007

Quantum information: Processing with superconducting circuits

Two research groups have successfully used a superconducting communication line to store and transfer information between distant quantum bits, or qubits, on a chip. The development reported in Nature this week is an important step towards developing quantum computers.

Previously scientists had only transferred information directly qubit to qubit in a superconducting system. Now groups led by Raymond Simmonds and Johannes Majer demonstrate that quantum coherence of the signal can be maintained over longer distances using photons. Information about the quantum state of one qubit is passed into an optical resonant cavity several millimetres long. A second qubit at the other end of the cavity retrieves the information at a later time. The technique could be scaled up, allowing a large number of qubits to communicate across an electronic chip.

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