Superconducting bus heralds quantum chip

TO GO mainstream, quantum computers will have to be made in bulk. A working quantum chip brings that goal a step nearer.

Japanese researchers have already shown that two quantum bits or “qubits” can be entangled on the surface of a chip (New Scientist, 22 February 2003, p 16). Now two separate groups at the US National Institute of Standards and Technology (NIST) in Boulder, Colorado, (Nature, vol 449, p 438) and at Yale University (Nature, vol 449, p 443) have used a photon in a cavity to transmit data between two qubits on a superconducting chip. One…