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Quantum teleportation is an important step in improving quantum computing.

Beam me up is one of the most famous catchphrases from the Star Trek series. It is the command issued when a character wishes to teleport from a remote location back to the Starship Enterprise.

While human teleportation exists only in science fiction, teleportation is possible in the subatomic world of quantum mechanicsalbeit not in the way typically depicted on TV. In the quantum world, teleportation involves the transportation of information, rather than the transportation of matter.

Last year scientists confirmed that information could be passed between photons on computer chips even when the photons were not physically linked.

Now, according to new research from the University of Rochester and Purdue University, teleportation may also be possible between electrons.

In a paper published in Nature Communications and one to appear in Physical Review X, the researchers, including John Nichol, an assistant professor of physics at Rochester, and Andrew Jordan, a professor of physics at Rochester, explore new ways of creating quantum-mechanical interactions between distant electrons. The research is an important step in improving quantum computing, which, in turn, has the potential to revolutionize technology, medicine, and science by providing faster and more efficient processors and sensors.

Quantum teleportation is a demonstration of what Albert Einstein famously called spooky action at a distancealso known as quantum entanglement. In entanglementone of the basic of concepts of quantum physicsthe properties of one particle affect the properties of another, even when the particles are separated by a large distance. Quantum teleportation involves two distant, entangled particles in which the state of a third particle instantly teleports its state to the two entangled particles.

Quantum teleportation is an important means for transmitting information in quantum computing. While a typical computer consists of billions of transistors, called bits, quantum computers encode information in quantum bits, or qubits. A bit has a single binary value, which can be either 0 or 1, but qubits can be both 0 and 1 at the same time. The ability for individual qubits to simultaneously occupy multiple states underlies the great potential power of quantum computers.

Scientists have recently demonstrated quantum teleportation by using electromagnetic photons to create remotely entangled pairs of qubits.

Qubits made from individual electrons, however, are also promising for transmitting information in semiconductors.

Individual electrons are promising qubits because they interact very easily with each other, and individual electron qubits in semiconductors are also scalable, Nichol says. Reliably creating long-distance interactions between electrons is essential for quantum computing.

Creating entangled pairs of electron qubits that span long distances, which is required for teleportation, has proved challenging, though: while photons naturally propagate over long distances, electrons usually are confined to one place.

In order to demonstrate quantum teleportation using electrons, the researchers harnessed a recently developed technique based on the principles of Heisenberg exchange coupling. An individual electron is like a bar magnet with a north pole and a south pole that can point either up or down. The direction of the polewhether the north pole is pointing up or down, for instanceis known as the electrons magnetic moment or quantum spin state. If certain kinds of particles have the same magnetic moment, they cannot be in the same place at the same time. That is, two electrons in the same quantum state cannot sit on top of each other. If they did, their states would swap back and forth in time.

The researchers used the technique to distribute entangled pairs of electrons and teleport their spin states.

We provide evidence for entanglement swapping, in which we create entanglement between two electrons even though the particles never interact, and quantum gate teleportation, a potentially useful technique for quantum computing using teleportation, Nichol says. Our work shows that this can be done even without photons.

The results pave the way for future research on quantum teleportation involving spin states of all matter, not just photons, and provide more evidence for the surprisingly useful capabilities of individual electrons in qubit semiconductors.

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Is teleportation possible? Yes, in the quantum world - University of Rochester

The U.S. Department of Energy (DOE) announced this week that it has named 76 scientists from across the country, including assistant professor of physics Chen Wang, to receive significant funding for research with its Early Career Award. It provides university-based researchers with at least $150,000 per year in research support for five years.

DOE Under Secretary for Science Paul Dabbar says DOE is proud to support funding that will sustain Americas scientific workforce and create opportunities for our researchers to remain competitive on the world stage. By bolstering our commitment to the scientific community, we invest into our nations next generation of innovators.

Wang says, I feel very honored to receive this award. This is a great opportunity to explore a new paradigm of reducing error for emerging quantum technologies.

His project involves enhancing quantum bit (qubit) performance using a counter-intuitive new approach. He will harness friction usually an unwelcome source of error in quantum devices to make qubits perform with fewer errors. The work is most relevant for quantum computing, he says, but potential applications include also cryptography, communications and simulations.

One of the basic differences between classical and quantum computing which is not in practical use yet is that classical computers perform calculations and store data using stable bits labeled as zero or one that never unintendently change. Accidental change would introduce error.

By contrast, in quantum computing, qubits can flip from zero to one or anywhere between. This is a source of their great promise to vastly expand quantum computers ability to perform calculations and store data, but it also introduces errors, Wang explains.

The world is intrinsically quantum, he says, so using a classical computer to make predictions at the quantum level about the properties of anything composed of more than a few dozens of atoms is limited. Quantum computing increases the ability to process information exponentially. With every extra qubit you add, the amount of information you can process doubles.

Think of the state of a bit or a qubit as a position on a sphere, he says. For a classical bit, a zero or one is stable, maybe the north or south pole. But a quantum bit can be anywhere on the surface or be continuously tuned between zero and one.

To address potential errors, Wang plans to explore a new method to reduce qubit errors by introducing autonomous error correction the qubit corrects itself. In quantum computing, correcting errors is substantially harder than in classical computing because you are literally forbidden from reading your bits or making backups, he says.

Quantum error correction is a beautiful, surprising and complicated possibility that makes a very exciting experimental challenge. Implementing the physics of quantum error correction is the most fascinating thing I can think of in quantum physics.

We are already familiar with how friction helps in stabilizing a classical, non-quantum system, he says, such as a swinging pendulum. The pendulum will eventually stop due to friction the resistance of air dissipates energy and the pendulum will not randomly go anywhere, Wang points out.

In much the same way, introducing friction between a qubit and its environment puts a stabilizing force on it. When it deviates, the environment will give it a kick back in place, he says. However, the kick has to be designed in very special ways. Wang will experiment using a super-cooled superconducting device made of a sapphire chip on which he will deposit a very thin patterned aluminum film.

He says, Its a very difficult challenge, because to have one qubit correct its errors, by some estimates you need tens to even thousands of other qubits to help it, and they need to be in communication. But it is worthwhile because with them, we can do things faster and we can do tasks that are impossible with classical computing now.

Read more:
Physicist Chen Wang Receives DOE Early Career Award - UMass News and Media Relations

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Global Quantum Computing for Enterprise Market Expected to Reach Highest CAGR by 2025 Top Players: 1QB Information Technologies, Airbus, Anyon...

Quantum teleportation is an important step in improving quantum computing.

Beam me up is one of the most famous catchphrases from the Star Trek series. It is the command issued when a character wishes to teleport from a remote location back to the Starship Enterprise.

While human teleportation exists only in science fiction, teleportation is possible in the subatomic world of quantum mechanicsalbeit not in the way typically depicted on TV. In the quantum world, teleportation involves the transportation of information, rather than the transportation of matter.

Last year scientists confirmed that information could be passed between photons on computer chips even when the photons were not physically linked.

Now, according to new research from the University of Rochester and Purdue University, teleportation may also be possible between electrons.

A quantum processor semiconductor chip is connected to a circuit board in the lab of John Nichol, an assistant professor of physics at the University of Rochester. Nichol and Andrew Jordan, a professor of physics, are exploring new ways of creating quantum-mechanical interactions between distant electrons, promising major advances in quantum computing. Credit: University of Rochester photo / J. Adam Fenster

In a paper published in Nature Communications and one to appear in Physical Review X, the researchers, including John Nichol, an assistant professor of physics at Rochester, and Andrew Jordan, a professor of physics at Rochester, explore new ways of creating quantum-mechanical interactions between distant electrons. The research is an important step in improving quantum computing, which, in turn, has the potential to revolutionize technology, medicine, and science by providing faster and more efficient processors and sensors.

Quantum teleportation is a demonstration of what Albert Einstein famously called spooky action at a distancealso known as quantum entanglement. In entanglementone of the basic of concepts of quantum physicsthe properties of one particle affect the properties of another, even when the particles are separated by a large distance. Quantum teleportation involves two distant, entangled particles in which the state of a third particle instantly teleports its state to the two entangled particles.

Quantum teleportation is an important means for transmitting information in quantum computing. While a typical computer consists of billions of transistors, called bits, quantum computers encode information in quantum bits, or qubits. A bit has a single binary value, which can be either 0 or 1, but qubits can be both 0 and 1 at the same time. The ability for individual qubits to simultaneously occupy multiple states underlies the great potential power of quantum computers.

Scientists have recently demonstrated quantum teleportation by using electromagnetic photons to create remotely entangled pairs of qubits.

Qubits made from individual electrons, however, are also promising for transmitting information in semiconductors.

Individual electrons are promising qubits because they interact very easily with each other, and individual electron qubits in semiconductors are also scalable, Nichol says. Reliably creating long-distance interactions between electrons is essential for quantum computing.

Creating entangled pairs of electron qubits that span long distances, which is required for teleportation, has proved challenging, though: while photons naturally propagate over long distances, electrons usually are confined to one place.

In order to demonstrate quantum teleportation using electrons, the researchers harnessed a recently developed technique based on the principles of Heisenberg exchange coupling. An individual electron is like a bar magnet with a north pole and a south pole that can point either up or down. The direction of the polewhether the north pole is pointing up or down, for instanceis known as the electrons magnetic moment or quantum spin state. If certain kinds of particles have the same magnetic moment, they cannot be in the same place at the same time. That is, two electrons in the same quantum state cannot sit on top of each other. If they did, their states would swap back and forth in time.

The researchers used the technique to distribute entangled pairs of electrons and teleport their spin states.

We provide evidence for entanglement swapping, in which we create entanglement between two electrons even though the particles never interact, and quantum gate teleportation, a potentially useful technique for quantum computing using teleportation, Nichol says. Our work shows that this can be done even without photons.

The results pave the way for future research on quantum teleportation involving spin states of all matter, not just photons, and provide more evidence for the surprisingly useful capabilities of individual electrons in qubit semiconductors.

References:

Conditional teleportation of quantum-dot spin states by Haifeng Qiao, Yadav P. Kandel, Sreenath K. Manikandan, Andrew N. Jordan, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra and John M. Nichol, 15 June 2020, Nature Communications.DOI: 10.1038/s41467-020-16745-0

Coherent multi-spin exchange in a quantum-dot spin chain by Haifeng Qiao, Yadav P. Kandel, Kuangyin Deng, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Edwin Barnes, John M. Nichol, Accepted 12 May 2020, Physical Review X.arXiv: 2001.02277

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Teleportation Is Indeed Possible At Least in the Quantum World - SciTechDaily

Honeywell has announced the creation of the worlds highest-performing quantum computing system. With a quantum volume of 64, the Honeywell quantum computer is twice as powerful as the next alternative in the industry.

What makes our quantum computers so powerful is having the highest quality qubits, with the lowest error rates. This is a combination of using identical, fully connected qubits and precision control, said Tony Uttley, president of Honeywell Quantum Solutions.

The core of the Honeywell system is an ultra-high vacuum chamber, which is a stainless steel sphere, about the size of a basketball. It has portals to allow in laser light, and from which the air has been pumped out such that it contains a vacuum of five times less particles than outer space. The chamber is cryogenically cooled to the temperature slightly above absolute zero (-262.7 C).

Inside the chamber are ion traps, each of which is the size of a coin of 25 US cents (24.3 mm). The ion plays the role of a qubit, and it is controlled by a laser, which is aimed at trapping the charge from outside the sphere through a small glass window. Within the chamber, electric fields levitate individual atoms 0.1 mm above an ion trap, a silicon chip covered in gold about the size of a quarter. Scientists shine lasers at these positively charged atoms to perform quantum operations.

For the context of how small an atom is, if you cup your hands into a sphere, youre holding about a trillion trillion atoms, Tony said.

According to the company, the main focus while building the quantum computer was on eliminating the errors present within the system on smaller numbers of qubits and then working to scale up the number of qubits. Low errors in the quantum operations expand the quantum volume, ultimately increasing the capability of quantum computing.

The Honeywell quantum computer has already been tested by JPMorgan Chase, one of the largest financial institutions, which has its own quantum experts. In addition to JPMorgan Chase, other customers whose names the company does not disclose are testing the new Honeywell system. According to Honeywell, these are companies and organizations that are related to chemistry, materials science, machine learning, and optimization. Later this year, Honeywell, along with Microsoft, will provide access to the new quantum computer through the Microsoft Azure cloud.

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Honeywell announces the creation of worlds highest performing quantum computer - Inceptive Mind