English News

Light and atoms get entangled

Date: 2006-02-28

Physicists have for the first time entangled two atomic quantum bits, or "qubits", that are separated by
long distances. Alex Kuzmich, Brian Kennedy and colleagues at the Georgia Institute of Technology in the US  did this by entangling an atomic qubit with a photon, sending the photon down an optical fibre to a
neighbouring lab, and then converting the photon into another atomic qubit. Meanwhile, Harald Weinfurter and   co-workers at the Max-Planck Institute for Quantum Optics in Garching and the Ludwig-Maximilians University in   Munich have entangled an atom with a photon at a wavelength suitable for low-loss communication over long   distances.