Jun 28, 2009 Yale researchers run quantum algorithms on a solid-state processor for the first time

While the debate over D-Wave continued, laboratories were improving the superconducting qubit that NEC had first demonstrated. The early devices lost their quantum state almost at once. In 2007 a group at Yale introduced the transmon, a design far less sensitive to stray electrical noise, which held its state much longer.

The next step was to put several such qubits on one chip, make them interact on command, and run an algorithm with them.

In June 2009 Leonardo DiCarlo, Robert Schoelkopf and their colleagues at Yale reported a chip with two transmon qubits, coupled through a microwave cavity that acted as a bus between them. It ran simple versions of Grover's search and the Deutsch–Jozsa algorithm.

These were the same small algorithms run with NMR eleven years earlier. The difference was the hardware: an electronic circuit, fabricated on a chip and controlled by microwave signals, like a rudimentary microprocessor. Yale described it as the first electronic quantum processor. It was the approach that IBM and Google would later scale up.

Here we demonstrate a two-qubit superconducting processor and the implementation of the Grover search and Deutsch–Jozsa quantum algorithms