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Superfast Light Source Made From Artificial Atom

Superfast light sources can be used, for example, in laser lights, LED lights and in single-photon light sources for quantum technology. New research results show that light sources can be made much faster by using a principle that was predicted theoretically in 1954.
For example, from an electric current — and emit energy as light. But the energy can also be lost as heat and it is therefore important that the light sources emit the light as quickly as possible, before the energy is lost as heat. Superfast light sources can be used, for example, in laser lights, LED lights and in single-photon light sources for quantum technology. New research results from the Niels Bohr Institute show that light sources can be made much faster by using a principle that was predicted theoretically in 1954. The results are published in the scientific journal, Physical Review Letters.

Researchers at the Niels Bohr Institute are working with quantum dots, which are a kind of artificial atom that can be incorporated into optical chips. In a quantum dot, an electron can be excited (i.e. jump up), for example, by shining a light on it with a laser and the electron leaves a ‘hole’. The stronger the interaction between light and matter, the faster the electron decays back into the hole and the faster the light is emitted.

But the interaction between light and matter is naturally very weak and it makes the light sources very slow to emit light and this can reduce energy efficiency. Already in 1954, the physicist Robert Dicke predicted that the interaction between light and matter could be increased by having a number of atoms that ‘share’ the excited state in a quantum superposition

Quantum speed up

Demonstrating this effect has been challenging so far because the atoms either come so close together that they bump into each other or they are so far apart that the quantum speed up does not work. Researchers at the Niels Bohr Institute have now finally demonstrated the effect experimentally, but in an entirely different physical system than Dicke had in mind. They have shown this so-called superradiance for photons emitted from a single quantum dot.

“We have developed a quantum dot so that it behaves as if it was composed of five quantum dots, which means that the light is five times stronger. This is due to the attraction between the electron and the hole. But what is special is that the quantum dot still only emits a single photon at a time. It is an outstanding single-photon source,” says Søren Stobbe, who is an associate professor in the Quantum Photonic research group at the Niels Bohr Institute at the University of Copenhagen and led the project. The experiment was carried out in collaboration with Professor David Ritchie’s research group at the University of Cambridge, who have made the quantum dots.


Petru Tighineanu, a postdoc in the Quantum Photonics research group at the Niels Bohr Institute, has carried out the experiments and he explains the effect as such, that the atoms are very small and light is very ‘big’ because of its long wavelength, so the light almost cannot ‘see’ the atoms — like a lorry that is driving on a road and does not notice a small pebble. But if many pebbles become a larger stone, the lorry will be able to register it and then the interaction becomes much more dramatic. In the same way, light interacts much more strongly with the quantum dot if the quantum dot contains the special superradiant quantum state, which makes it look much bigger.

Increasing the light-matter interaction

“The increased light-matter interaction makes the quantum dots more robust in regards to the disturbances that are found in all materials, for example, acoustic oscillations. It helps to make the photons more uniform and is important for how large you can build future quantum computers,” says Søren Stobbe.

He adds that it is actually the temperature, which is only a few degrees above absolute zero, that limits how fast the light emissions can remain in their current experiments. In the long term, they will study the quantum dots at even lower temperatures, where the effects could be very dramatic.

India Captain Kapil Dev says iconic Sachin Tendulkar did not know how to convert hundreds into doubles or triples

Former India captain Kapil Dev says the iconic Sachin Tendulkar “did not know how to make double hundreds, triple hundreds and 400 though he had the ability” to scale such peaks and was “stuck in the Mumbai school of cricket”.

“Don’t get me wrong, but I think Sachin didn’t do justice to his talent. I always thought he could have done much more than what he did,” Dev was quoted as saying by the ‘Khaleej Times’.

“He (Sachin) got stuck with Bombay cricket. He didn’t apply himself to the ruthless international cricket. I think he should have spent more time with Vivian Richards than some of the Bombay guys who played just neat and straight cricket.

“Sachin was a much better cricketer but somewhere along the line he just knew how to score hundreds. He didn’t know how to make it a double hundred, or a triple or even 400s,” added the 1983 World Cup winning India captain. The great all-rounder, under whose captaincy India won its maiden World Cup in 1983, said he would have advised Tendulkar to play like Virender Sehwag.

“He (Sachin) had the ability. He was technically sound but I felt he was there to get his hundred and that’s it. Unlike Richards, Sachin wasn’t ruthless, he was more of a perfect, or rather correct cricketer. Had I spent more time with him I would have told him ‘go enjoy yourself, play like Virender Sehwag’. You will be a much better cricketer.”

The 56-year-old Dev made these remarks before a select crowd at the Cove Beach Club at Jumeirah Hotel in Dubai alongside three other cricketing icons — Shane Warne, Wasim Akram and Ian Botham. Spin legend Warne remarked that Tendulkar was special.

“He is a wonderful player and in my 20-odd years of playing, he is the best batsman that I played against. The expectations he was under and the skill he had against fast and spin. The way he judged the balls. He was great for the game of cricket and he was a fantastic and wonderful player. He dominated bowlers in the mid-90s and he was just outstanding against any bowler. He also played exceptionally well against Australia,” said Warne.

“I now see Sachin’s different side as I am now doing business with him. He is a wonderful friend,” he added.Pace bowling great Akram regretted for having played much against Tendulkar. “One of the regrets Waqar Younis and I had as a bowler is that we never played Test cricket against Tendulkar for nearly 10 years,” he said. “We played against Sachin when he made his debut in 1989 when he was 16 and then, we played Tests against Sachin in 1999 in India. As Warne said, he was the best in the game and 100 international hundreds speaks volumes of his talent.”

When the former greats were asked to name the best they had played against, Kapil said: “I think Viv in my time is the best I have seen. More than his cricket, it was the way he played the game and his attitude. I loved to take his wicket all the time.”
Botham echoed similar sentiments: “Viv Richards is certainly the best player I have seen in all formats of the game. I don’t think there has been anyone better. I remember in Old Trafford we left him in the raps and Michael Holding came out to bat and 200 runs later, Richards was 189 not out — which was obscene. You bowl him outside the off stump with a packed field, and he will flick you into the grandstand on the leg side. He never read the MCC coaching annual.”

Akram added: “When I started out, it was the great Viv Richards and the Little Master Sunil Gavaskar. I got out him out only once. In the 90s, it was (Brian) Lara and Tendulkar.”


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