If a quantum processor is to run algorithms beyond the scope of classical simulations, a large number of qubits are required, along with low error rates on readout and logical operations, such as single and two-qubit gates.
By employing a technique called scanning tunnelling microscopy lithography, the scientists are able to directly measure each atom’s wavefunction, thereby determining its exact location in the chip. “We are the only group in the world who can actually see where our qubits are,”
Every Bristlecone chip features 72 qubits. The general assumption in the industry is that it will take 49 qubits to achieve quantum supremacy, but Google also cautions that a quantum computer isn’t just about qubits. “Operating a device such as Bristlecone at low system error requires harmony between a full stack of technology ranging from software and control electronics to the processor itself,” the team writes today.
The world clearly needs more powerful processors, as demand explodes for artificial intelligence workloads that require faster and more efficient chips than what’s currently available from Nvidia NVDA and AMD . But there’s a healthy amount of debate among researchers and scientists about whether quantum computers are useful for practical real-world applications
Physics: Record-Breaking Nanochip Reaches One-Thousandth of a Degree From Absolute Zero, ‘Magic’ Quantum Threshold
“The combination of cooling systems allowed us to cool our chip down to below 3 millikelvin, and we are optimistic than we can use the same method to reach the magic 1 millikelvin limit,” Dominik Zumbühl, a physicist at the University of Basel, said in the press release.
IBM has been offering quantum computing as a cloud service since last year when it came out with a 5 qubit version of the advanced computers. Today, the company announced that it’s releasing 20-qubit quantum computers, quite a leap in just 18 months