A scanning tunnelling microscope image showing the electron wave function of a qubit made from a phosphorus atom precisely positioned in silicon. Scientists from the University of New South Wales (UNSW) have announced making two atom quantum bits (qubits) "talk" to each other in silicon, providing the ability to see their exact position in the solid state. The team, led by Director of the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) -- and recent recipient of the Australian of the Year award -- UNSW Professor Michelle Simmons, created the atom qubits by precisely positioning and encapsulating individual phosphorus atoms within a silicon chip. The information is stored on the quantum spin of a single phosphorus electron, the university said. "In placing our phosphorus atoms in the silicon to make a qubit, we have demonstrated that we can use a scanning probe to directly measure the atom's wave function, which tells us its exact physical location in the chip.
An Australian research team led by the renowned quantum physicist Prof Michelle Simmons has announced a major breakthrough in quantum computing, which researchers hope could lead to much greater computing power within a decade. Simmons, a former Australian of the Year, and her team at the University of New South Wales announced in a paper published in Nature journal on Thursday that they have been able to achieve the first two-qubit gate between atom qubits in silicon, allowing them to communicate with each other at a 200 times faster rate than previously achieved at 0.8 nanoseconds. A qubit is a quantum bit. In this design, it is built from single phosphorus atoms in silicon. In standard computing, a bit can exist in one of two states – 1 or 0. For qubits, it can be 1 or 0 or both simultaneously, which is referred to as a superposition.
Researchers from the University of New South Wales (UNSW) have announced a new milestone in their pursuit of creating a quantum computer chip in silicon. Working alongside experts at Indiana-based Purdue University, the researchers built two qubits; the first was an engineered molecule consisting of two phosphorus atoms with a single electron, and the other a single phosphorus atom with a single electron. UNSW said the two qubits were then placed 16 nanometres apart in a silicon chip. "By patterning a microwave antenna above the qubits with precision alignment, the qubits were exposed to frequencies of around 40GHz," the university explained. "The results showed that when changing the frequency of the signal used to control the electron spin, the single atom had a dramatically different control frequency compared to the electron spin in the molecule of two phosphorus atoms."
Scientists from the University of New South Wales (UNSW) have announced another step in the race to develop the first quantum computer, touting the ability to build 3D atomic-scale quantum chips. The researchers from the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) at UNSW said they have demonstrated that atomic precision qubits can be built in a 3D device by using an atomic quantum bit (qubit) fabrication technique to multiply layers of a silicon crystal. Led by Professor Michelle Simmons, the researchers are the first to go public with the ability to demonstrate the feasibility of an architecture that uses atomic-scale qubits aligned to control lines -- which UNSW said are essentially very narrow wires -- inside a 3D design. Additionally, the team said it is able to align the different layers in their 3D device with nanometre precision, and also showed they can read out qubit states within one single measurement -- rather than having to rely on averaging out millions of experiments -- with very high fidelity. "This 3D device architecture is a significant advancement for atomic qubits in silicon. To be able to constantly correct for errors in quantum calculations -- an important milestone in our field -- you have to be able to control many qubits in parallel," Simmons said.
Australian scientists are said to have made a breakthrough in quantum computing after they were able to make two atom qubits'talk' to each other. The study, which was led by researchers from the University of New South Wales, involved creating qubits by precisely positioning individual phosphorus atoms in a silicon chip. Quantum bits, or qubits, are a unit of measure for quantum information. Once positioned, the scientists were able to get the qubits to communicate and correlate with each other. Pictured is an artist's impression of two'qubits' or quantum bits.