A team led by engineers and physicists¹ at the University of New South Wales (UNSW) in Sydney, Australia, have developed one of the key building blocks needed to make a quantum（量子论） computer using silicon²: a "single electron reader". Their work was published today in Nature. Quantum computers promise exponential（指数的） increases in processing speed over today's computers through their use of the "spin", or magnetic orientation³, of individual electrons to represent data in their calculations.

In order to employ electron spin, the quantum computer needs both a way of changing the spin state (write) and of measuring that change (read) to form a qubit（量子位） – the equivalent of the bits in a conventional（传统的，常见的） computer.

In creating the single electron reader, a team of engineers and physicists led by Dr Andrea Morello and Professor Andrew Dzurak, of the School of Electrical Engineering and Telecommunications at UNSW, has for the first time made possible the measurement of the spin of one electron in silicon in a single shot experiment. The team also includes researchers from the University of Melbourne and Aalto University in Finland.

"Our device detects the spin state of a single electron in a single phosphorus（磷） atom implanted in a block of silicon. The spin state of the electron controls the flow of electrons in a nearby circuit," said Dr Morello, the lead author of the paper, Single-shot readout of an electron spin in silicon.

"Until this experiment, no-one had actually measured the spin of a single electron in silicon in a single-shot experiment."

By using silicon—the foundation material of conventional computers—rather than light or the esoteric（秘传的，难懂的） materials and approaches being pursued by other researchers, the device opens the way to constructing a simpler quantum computer, scalable（可攀登的，可称量的） and amenable⁴ to mass-production.

The team has built on a body of research that has put Australia at forefront（最前线） of the race to construct a working quantum computer. In 1998 Bruce Kane, then at UNSW, outlined in Nature the concept for a silicon-based quantum computer, in which the qubits are defined by single phosphorus atoms in an otherwise ultra-pure silicon chip. The new device brings his vision closer.

"We expect quantum computers will be able to perform certain tasks much faster than normal computers, such as searching databases, modelling complex molecules⁵ or developing new drugs," says co-author Prof Andrew Dzurak. "They could also crack most modern forms of encryption（加密） ."

"After a decade of work trying to build this type of single atom qubit device, this is a very special moment."

Now the team has created a single electron reader, they are working to quickly complete a single electron writer and combine the two. Then they will combine pairs of these devices to create a 2-bit logic⁶ gate – the basic processing unit of a quantum computer.