UNSW makes atoms in silicon 'talk' in new quantum achievement

ZDNet

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.


UNSW unlocks qubit signal frequency control in quantum advancement

ZDNet

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."


Australian scientists move closer to world-beating quantum computer

The Guardian

Australian scientists, led by Australian of the year Michelle Simmons, have made a significant step in creating a world-beating, single-atom quantum computer. Simmons and her Australian team announced on Wednesday they had built quantum bits, known as qubits, from single phosphorus atoms in silicon, that could communicate and correlate with each other. Quantum computing is a field of science that aims to replace the building blocks of traditional computing, known as bits, with quantum particles. While classic bits can have a value of only 0 or 1, quantum bits can exist in multiple states at once. This means they can be thousands of times more efficient and potentially revolutionise computing.


Quantum leap from Australian research promises super-fast computing power

The Guardian

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.


UNSW has found a way to access information stored within atoms

ZDNet

The University of New South Wales (UNSW) has announced the demonstration of a compact sensor for accessing information stored in the electrons of individual atoms, touted as a breakthrough that brings a scalable quantum computer in silicon one step closer. UNSW is banking on silicon being the key to building the first quantum computer and the results of the research, conducted within the Professor Michelle Simmons-led Simmons group at the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T), show how this may be achieved. Quantum bits (qubits) made from electrons hosted on single atoms in semiconductors is a promising platform for large-scale quantum computers, the university believes, and creating qubits by precisely positioning and encapsulating individual phosphorus atoms within a silicon chip is the approach Simmons' teams are taking. Read also: Australia's ambitious plan to win the quantum race However, adding in all the connections and gates required for scale up of the phosphorus atom architecture was the challenge the researchers were faced with. "To monitor even one qubit, you have to build multiple connections and gates around individual atoms, where there is not a lot of room," Simmons said.