Начинаем наш телепортаж, или Муха-3
Oct. 5th, 2006 03:04 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
juan_gandhiScientists teleport two different objects
LONDON, England (Reuters) -- Beaming people in "Star Trek" fashion is still in the realms of science fiction, but physicists in Denmark have teleported information from light to matter bringing quantum communication and computing closer to reality.
Until now scientists have teleported similar objects such as light or single atoms over short distances from one spot to another in a split second.
But Professor Eugene Polzik and his team at the Niels Bohr Institute at Copenhagen University in Denmark have made a breakthrough by using both light and matter.
"It is one step further because for the first time it involves teleportation between light and matter, two different objects. One is the carrier of information and the other one is the storage medium," Polzik explained in an interview on Wednesday.
The experiment involved for the first time a macroscopic atomic object containing thousands of billions of atoms. They also teleported the information a distance of half a meter but believe it can be extended further.
"Teleportation between two single atoms had been done two years ago by two teams, but this was done at a distance of a fraction of a millimeter," Polzik, of the Danish National Research Foundation Center for Quantum Optics, explained.
"Our method allows teleportation to be taken over longer distances because it involves light as the carrier of entanglement," he added.
Quantum entanglement involves entwining two or more particles without physical contact.
Although teleportation is associated with the science-fiction series "Star Trek," no one is likely to be beamed anywhere soon.
But the achievement of Polzik's team, in collaboration with the theorist Ignacio Cirac of the Max Planck Institute for Quantum Optics in Garching, Germany, marks an advancement in the field of quantum information and computers, which could transmit and process information in a way that was impossible before.
"It is really about teleporting information from one site to another site. Quantum information is different from classical information in the sense that it cannot be measured. It has much higher information capacity and it cannot be eavesdropped on. The transmission of quantum information can be made unconditionally secure," said Polzik whose research is reported in the journal Nature.
Quantum computing requires manipulation of information contained in the quantum states, which include physical properties such as energy, motion and magnetic field, of the atoms.
"Creating entanglement is a very important step, but there are two more steps at least to perform teleportation. We have succeeded in making all three steps -- that is entanglement, quantum measurement and quantum feedback," he added.
LONDON, England (Reuters) -- Beaming people in "Star Trek" fashion is still in the realms of science fiction, but physicists in Denmark have teleported information from light to matter bringing quantum communication and computing closer to reality.
Until now scientists have teleported similar objects such as light or single atoms over short distances from one spot to another in a split second.
But Professor Eugene Polzik and his team at the Niels Bohr Institute at Copenhagen University in Denmark have made a breakthrough by using both light and matter.
"It is one step further because for the first time it involves teleportation between light and matter, two different objects. One is the carrier of information and the other one is the storage medium," Polzik explained in an interview on Wednesday.
The experiment involved for the first time a macroscopic atomic object containing thousands of billions of atoms. They also teleported the information a distance of half a meter but believe it can be extended further.
"Teleportation between two single atoms had been done two years ago by two teams, but this was done at a distance of a fraction of a millimeter," Polzik, of the Danish National Research Foundation Center for Quantum Optics, explained.
"Our method allows teleportation to be taken over longer distances because it involves light as the carrier of entanglement," he added.
Quantum entanglement involves entwining two or more particles without physical contact.
Although teleportation is associated with the science-fiction series "Star Trek," no one is likely to be beamed anywhere soon.
But the achievement of Polzik's team, in collaboration with the theorist Ignacio Cirac of the Max Planck Institute for Quantum Optics in Garching, Germany, marks an advancement in the field of quantum information and computers, which could transmit and process information in a way that was impossible before.
"It is really about teleporting information from one site to another site. Quantum information is different from classical information in the sense that it cannot be measured. It has much higher information capacity and it cannot be eavesdropped on. The transmission of quantum information can be made unconditionally secure," said Polzik whose research is reported in the journal Nature.
Quantum computing requires manipulation of information contained in the quantum states, which include physical properties such as energy, motion and magnetic field, of the atoms.
"Creating entanglement is a very important step, but there are two more steps at least to perform teleportation. We have succeeded in making all three steps -- that is entanglement, quantum measurement and quantum feedback," he added.
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no subject
Date: 2006-10-06 04:28 am (UTC)These journalists are truly amazing.
no subject
Date: 2006-10-06 12:30 pm (UTC)Quantum information, transferred through a distributed entangled state, cannot be measured (restored) unless the addressee receive classical information about the measurement on the sender's side.
no subject
Date: 2006-10-06 10:03 pm (UTC)Information exists only because it is measured. Before the measurement there is no information.
Maybe the following example will help. It is wrong to say "an electron has a coordinate, but it is a quantum coordinate, and cannot be measured". This leads to the picture of "hidden parameters", which is wrong. In fact electron has no coordinate UNTIL it is measured.
no subject
Date: 2006-10-07 09:54 am (UTC)1) electron A has spin pointing upward along the z-axis (+z) and electron B has spin pointing downward the z-axis (-z);
2) electron A has spin -z and electron B has spin +z.
The electrons are thus said to be entangled.
Now suppose you measure the spin along the z-axis at the destination B. There are two possible outcomes: +z and -z. But! If you obtain +z, I shall obtain -z at destination A with 100% probability. And vice versa,- if you obtain -z, I shall obtain +z at destination A with 100% probability.
That means that if you do your measurement and tell me the result, I can be sure about the result of my measurement (the spin of my electron) without any measurement at all.
Do you understand me? Having the result of measurement at destination B you need no measurement at destination A.
This result of measurement at destination B that you tell me is so called "classical information" and the state of electron at destination A (that is not measured at all) is called "quantum information".
no subject
Date: 2006-10-07 05:58 pm (UTC)1. Measuring of quantum numbers (i.e. classical experiment which provides knowledge about them)
2. Measuring of information, i.e. the expression of information in bits and bytes.
This is a widespread misunderstanding.
no subject
Date: 2006-10-09 02:22 pm (UTC)Anyway, thank you.