Scientists have taken a new step in this latest model, a work in just 36 microseconds that will take about 9,000 years of the classic. Photo: EFE

The Quantum computerStill experimental, based on Quantum bit, But they can also use photons, every particle of light. This Thursday 2nd June, 2022 we will tell you what it is.

Now, Scientists They have taken a new step in this latest model in just 36 microseconds a work that will take about 9,000 years for the classic.

Description of Quantum photonic processorBoryalis, published in the journal Nature, and its editors have confirmed that this is the biggest quantum benefit photonic experiment – showing its improvement against the classical system – that has been communicated to date.

“On average, Good algorithm Y. Super computer It will take more than 9,000 years to do so, ”said researchers from the Canadian quantum technology company Xanadu and researchers at the National Institute of Standards and Technology in the United States.

This system represents an improvement over the photonic devices previously demonstrated and could represent an important step towards the creation of quantum computers, summarizes Jonathan Lavoie’s scientific team.

Quantum device

One of the main purposes of quantum devices – based on both qubits and photons – is that they surpass the classical systems, computers and supercomputers currently on the market, establishing a quantum advantage or dominance.

But to date only a handful of experiments have reported this achievement, especially those models based on quantum bits – including controversy, when Google claimed that Quantum excelled in 2019, which was questioned. IBM.

What has now been published is the demonstration of this feature in a processor with photons and a method of demonstrating this is called boson sampling – a photon is an example of a boson, a primary particle.

This sampling is a calculation performed on a circuit through which photons travel, including a series of inputs and outputs and a network of mirror and stationary lenses among other quantum optical instruments.

In reality, the calculation is based on some parameters, due to changes occurring inside the circuit, determining how many photons end up in one particular output lane and not in another.

Circuit

And this is because the circuit, as explained by Carlos Sabin, a researcher in the theoretical physics department at the Autonomous University of Madrid, is undergoing a continuous transformation on everything that enters it.

These transformations can be caused, for example, by beam splittering – a device that splits a ray of light into two halves – with a certain probability that the photons change lanes in the circuit, achieving their redistribution as they exit.

It seems silly, says Sabin – who does not participate in this study – but it is not; It was discovered a few years ago that this calculation – knowing how many photons there are in a given output lane – is not quickly possible in a conventional computer.

And this is because photons have a threshold above which classical computers are unable to calculate at reasonable times.

“If the parameters of the circuit are randomly selected and from a certain number of particles and input and output lanes, the calculation of the potential relative to the output is almost not complicated for a conventional computer,” the researcher summarizes Efe.

The result

In the nature study, the team achieved the largest boson sample ever, with 216 lanes (125 photons on average) and a count in record time: 0.000036 seconds.

“While these claims are sometimes challenged intrinsically (there may be better calculations from classical computers than the authors guessed), these numbers surpass previous boson sample tests and quantum excellence tests with bits. Quantum superconductors from Google,” says Sabin.

“Results must be created in a race to demonstrate quantum superiority,” summarizes the physicist, who highlights that the system can easily be programmed to create certain conditions “with which it is known that universal quantum computing can be performed.”

He added that it would answer the most common criticism of boson sampling: its practical futility beyond the quantum superiority.



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