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Instead of focusing on the performance of the RCS, the error rate should be your primary concern here.
The Willow quantum chip, which was introduced by Google on Wednesday, is the company's most recent quantum processor. If you have spent any time online since then, you have surely come across some frantic reportage about it. One of the headlines states that Willow "crushes classical computers on a cosmic timescale," while another states that Google "unveils a quantum computer chip that is mind-boggling on a quantum level." The claim that Willow is capable of completing a computation that would theoretically take a classical computer a substantial amount of time longer than the 14 billion years that the universe has existed is the foundation upon which everything else is built. However, as you presumably well know, the chip does not represent something that is straightforward.
It is important to note that Google does not assert that it is the leader in quantum computing with Willow. This is something that the business did when it made the public debut of its previous generation quantum computer, Sycamore, in 2019. You may recall that Google made public the fact that it took Sycamore only two hundred seconds to complete a computation that, in theory, would have taken the world's fastest supercomputer at the time at least ten thousand years to do. According to the corporation, this accomplishment indicated that it had developed a quantum computer that was capable of solving problems that even the most advanced classical computers were unable to even attempt to tackle. In other words, Google has attained unprecedented levels of quantum dominance.
The claim, on the other hand, was soon met with opposition, with one researcher describing the revelation made by the corporation as "indefensible" and "just plain wrong." Since then, Google has refrained from discussing quantum supremacy. Instead, it simply states that it has accomplished something that is "beyond classical computation." That Sycamore was not a general-purpose quantum computer was one of the problems; rather, it was intended to outperform classical computers in a specific task known as random circuit sampling, or RCS. This was one of the reasons why the problem occurred. The problem with RCS is that, according to Google, it does not have any applications that are known to exist in the real world. On the other hand, the firm is once again praising the performance of RCS.
According to Google, Willow is capable of finishing its most recent RCS benchmark in less than five minutes. On the other hand, the business believes that it would take Frontier, which is presently the second most powerful supercomputer in the world, ten septillion years to accomplish the same operation. According to Google, this number "provides support for the idea that quantum computation takes place in a multitude of parallel universes, which is consistent with the concept that we are already living in a multiverse."
In a more pragmatic sense, Google is attempting to argue that the performance of RCS ought to be the criterion by which all quantum computers are evaluated. A statement made by Hartmut Neven, the founder of Google Quantum AI, states that "it's an entry point." It is impossible to achieve success with any other algorithm if you are unable to achieve success with random circuit sampling. He continues by saying that RCS is "now widely used as a standard in the field."
Other businesses, such as Honeywell and IBM, on the other hand, make use of a metric known as quantum volume in order to highlight their revolutionary achievements. By taking into account the ways in which a machine's qubits interact with one another, they assert that this demonstrates a more comprehensive grasp of the capabilities of a computer. Unfortunately, the spec sheet that Google released for Willow does not include any mention of quantum volume, which makes it difficult to make comparisons between the two specifications.
With that being said, the claim that Google is making today that Willow is "below the threshold" is significantly more impressive than the previous one. The fact that the quantum bits that quantum computers are based on are difficult to control has been the issue that has dogged every attempt to construct a quantum computer that is functional up until this point. Due to the fact that they only maintain their quantum state for fractions of a second, the likelihood of mistakes occurring in a system increases in proportion to the number of qubits that are added to it. On the other hand, Google claims that it has discovered a method to reduce errors when it adds additional qubits to the system through the use of Willow. The company claims that Willow is the first time that something like this has ever been done.
"This is the most convincing prototype for a scalable logical qubit that has been created to date by virtue of the fact that it is the first system below threshold. "It is a strong indication that it is possible to construct quantum computers that are both useful and very large," says Neven. The use of Willow gets us one step closer to being able to execute pragmatic, commercially important algorithms that are not capable of being duplicated on traditional computers.
That is the true breakthrough that has occurred here, and it is one that speaks to a future in which quantum computers could tackle problems that have a direct impact on the lives of people. In spite of this, that future has not yet arrived, and even Google acknowledges that it still has a lot of work to do before it reaches its destination.
