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Nature 449, 415-417 (27 September 2007) | doi:10.1038/449415a; Published online 26 September 2007
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- Georg-August-Universitat Gottingen
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Quantum physics: Qubits ride the photon bus
Antti O. Niskanen1 & Yasunobu Nakamura2
Abstract
Quantum mechanics using whole electrical circuits might seem a far-fetched idea. But make the circuits superconducting, and they can be used to send and collect single photons, rather like atoms do — only better.
The interaction of light and matter is all around us: we can see the objects that surround us only because their constituent atoms continuously emit and absorb electromagnetic radiation. Not only visible light, but everything from γ-rays through to radio waves, and even the alternating fields of power lines and the gigahertz signals inside a digital computer, are manifestations of fundamentally the same thing at different energy scales — the propagation of the discrete packets of electromagnetic energy known as photons.
- Antti O. Niskanen is at the VTT Technical Research Centre of Finland, POB 1000, 02044 VTT, Espoo, Finland.
Email: antti.niskanen@vtt.fi - Yasunobu Nakamura is at the NEC Nano Electronics Research Laboratories, Tsukuba, Ibaraki 305-8501, and at the Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan.
Email: yasunobu@ce.jp.nec.com
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