The field of quantum computing seems to produce new breakthroughs every week to increase the usefulness and computational performance of quantum-based solutions. Sky News reports that the latest development at the University of New South Wales in Sydney enables quantum systems that use millions of qubits
Australian researchers have apparently solved the problem of quantum scaling. This latest development may allow quantum systems to use millions of qubits instead of the current maximum of around a hundred. And leveraging millions of qubits seems to be a very important step in increasing the value of the quantum computing market in the long run. The market for Quantum Computing as a Service (QCaaS) is estimated to grow to $ 26 billion by the end of the decade.
Sydney researchers have approached the quantum scaling problem from the control side of the equation. Any automated system that is designed to operate on its own requires a control mechanism that allows the user to change the input variables. In quantum computing today, this is done through microwave electromagnetic fields. In addition to essentially every qubit, there is a wire in quantum systems through which an electric current is conducted. This, in turn, creates a magnetic field according to the strength of the current, which allows the user of the quantum computer to manipulate the value of qubit and to keep the qubit stable enough to perform the actual calculation expected of it.
However, this solution has a major problem that has made it difficult to scale quantum computers. And this is the heat. The more durable or intense the current, the warmer the electrical wires will be. Because the microwave electromagnetic field has a small range, scientists had to place essentially a single wire directly next to each qubit. One can imagine what the result would be if they tried to scale up such a construct into the million range. However, connecting millions of different wires to the quantum chip would not only take up too much space, but would also jeopardize another current requirement for achieving stability in quantum computing efforts: qubits are currently only able to work efficiently and maintain their quantum state if – around 270 degrees Celsius they are cooled to temperature. More wiring means more energy consumption and more heat output, which means it would be increasingly difficult to maintain this target temperature.
The solution was actually simple. Instead of trying to control each qubit with a single wire, the team tried to design a system that would allow an electromagnetic field to surround the qubits from above and that could affect all of them at once. “We first removed the wire next to the qubits and then came up with a novel way to deliver a microwave frequency magnetic control field to the entire system. In principle, we were able to deliver control fields to as many as four million qubits,” Dr. Jarryd Pla said. head of research. A new component, a dielectric resonator, was then added to the device. There are two key innovations here, the first is that we don’t have to put a lot of energy into getting the strong field that drives the qubits, which basically means we don’t produce much heat.The second is that the field is very even across the chip, thus, millions of qubits all experience the same level of control, “Pla added.
Of course, scaling the basic unit of quantum computers, qubit, presents other challenges. However, managing the system no longer seems to be a problem. This is an important step on the road to the actual proliferation of quantum computers in our future, which is already a fact rather than a fiction. According to a recent report, the market for quantum computing as a service is already expected to reach $ 4 billion in 2025, up from $ 1 billion in 2020. That number could grow 6.5-fold in just five years, and the market is expected to reach $ 26 billion by 2030. Keep in mind that this is just a special slice of quantum computing. Access to the Quantum Computing Runtime Access service is marketed by companies such as Microsoft Azure and Amazon Web Services. With a value of $ 26 billion, it does not include market investments and research that would significantly swell the value.
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