US Patent 7145170 - Superconducting Quantum Bit NOT gate

http://www.freepatentsonline.com/7145170.pdf

Quantum computing is proposed as a possible mechanism having inherent parallel processing advantages over conventional computers. Gradually circuit designs are being proposed to mirror conventional logic functions using quantum computers. The circuit proposed by this patent from NEC performs a controlled NOT function. Claim 1 reads:

1. A superconducting charge quantum multi-bit device, comprising: a first superconducting charge quantum bit device serving as a target quantum bit circuit; a second superconducting charge quantum bit device serving as a control quantum bit circuit; and an electric capacitor coupling the first and second superconducting charge quantum bit devices.