20 years ago, designing scalable Quantum computer-based on encoding information on a silicon lattice was conceived at UNSW Sydney. This approach of building a computer chip out of individual atoms was impossible. But, a team of researchers has now created a super-fast Silicon Spin Two Qubit Gate. The central component of the quantum computer validating this idea over the past two decades. We’ve developed completely fabricated technologies that have pushed the boundaries of what the quantum realm is capable of.
What is Silicon SPin Two Qubit Gate?
Donor qubits in silicon have held the world record for the longest coherence time and highest Fidelity’s using the atomic fabrication technique. we can optimize every aspect of the chip. They have demonstrated exquisite control to achieve extremely high fidelity and demonstrated the lowest electrical noise atomic-scale circuitry to connect to that qubit with our atomic precision manufacturing capability.
We are able to build a really fast highly accurate two-qubit gate. The fundamental building block of a scalable quantum computer in silicon. The team uses a scanning tunneling microscope to precision place and encapsulate phosphorus atoms in silicon. This helps in getting the distance between the two qubits in a critical position.
We can engineer the whole device with atomic precision we’ve managed to place the qubits just 13 nanometers apart in a silicon crystal. This exact distance allows us to quickly control the interaction between them. We have also been able to fabricate the whole control circuitry with submillimeter precision to maintain the high fidelity. This circuitry allows us to entangle electron spins that holds the encoded Cubase by applying voltages to the case. We have controllably moved as the electron spins together for nanoseconds then brought them apart and measured what had happened to them.
What Comes Next From Here
Tracking in realtime what state their qubits are in how they interact and evolve using this interaction. We can entangle the two qubits and swap their states by timing how long we light them intact. This is the first time anyone’s able to interact to electron spins between different atom qubits. A lot of people thought this wouldn’t be possible. Since this is at the very limit of human engineering needed for every aspect of the device. But, this was the final fundamental experiment we needed to do to prove that we could actually build a quantum computer out of atoms. The goal is to build a 10 qubit quantum integrated circuit in coming next three to four years.