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quantum teleportation qubit

Researchers successfully achieve complex quantum teleportation for the first time

For the first time, researchers from Austria and China have managed to teleport three dimensional quantum states. This teleportation of higher dimensional states might play an important role in quantum computers in the coming days.

Scientists from the University of Vienna and the Austrian Academy of Sciences have demonstrated what was previously thought of as only a theoretical possibility. With the scientists from the University of Science and Technology of China, they were able to teleport complex high-dimensional quantum states. This is reported in the journal Physical Review Letters.

Scientists teleported the quantum state of a qutrit to another distant one. Earlier scientists were able to transport qubits, which have only two-level states. But scientists have now successfully teleported a qutrit which was created from the photon and has three-level states.

Since the 1990s, it was known that multidimensional quantum teleportation can be achieved. Manuel Erhard, Vienna Institute for Quantum Optics said that the first step was to design a technique to implement high-dimensional teleportation along with the technology. To teleport a quantum state, it is encoded in the possible paths which can be taken by the photon. Paths can be correlated to three optical fibers. Interestingly, in quantum physics, one photon might be present in all the fibres at once.

Bell measurement is at the core of quantum teleportation. A multiport beam splitter is used that directs photons with the help of many inputs and outputs thereby connecting the optical fibers. Also, auxiliary photons were used which were sent to the multiple beam splitter for interfering with other photons.

By selecting specific interference patterns, quantum information can be sent to a photon situated far away from input photon, without them interacting. This concept can be extended to as many dimensions as possible.

By achieving this, the research team has demonstrated that a quantum internet can be created in the future by transmitting large amounts of information. Anton Zeilinger, a scientist at Austrian Academy of Sciences and the University of Vienna said that the result will help in the connection of quantum computers having information capacities greater than qubits.

Chinese researchers also find immense potential in the field of multidimensional quantum teleportation. Jian-Wei Pan, University of Science and Technology of China said that their research will be the foundation for a quantum network system that can be built in the future. Pan presented his points at the University of Vienna and the Academy recently.

Quantum physicists in the future will also try to demonstrate the teleportation of the entire quantum state of one photon or atom.

Research Paper: Quantum Teleportation in High Dimensions


Researchers for the first time report quantum teleportation in qutrit

Scientists have successfully completed teleportation of a qutrit which is a piece of quantum information based on three states and this has opened a whole new host of opportunities and possibilities for quantum computing and communication sector.

Until now, Qubits were used for quantum transportation for long distances, however, a new proof of concept study has shown that future quantum networks will be able to carry much more data with lesser interference that was being thought. Bits in classical computing can be in two states, either 1 or 0. However, in quantum computing, there is qubit which can be both 0 or 1 at the same time called superposition. Qutrit has a similar relation to a trit, adding superposition to the classical examples, that are represented as 0,1 or 2. A qutrit can be all of these at one single time, which makes a huge leap in terms of computer processing power or the amount of information that can be sent at once. It adds another level of complexity for quantum computing researchers.

Quantum teleportation is simply getting the quantum information from one place to the other through a process called quantum entanglement. It is a case when two quantum particles are interlinked and one reveals the properties of the other, no matter how far apart they might be present. The quantum information can be beamed via photons of light that might be used in the future to create an unhackable internet network which will be protected by fundamental laws of physics.

By splitting the path of a photon into 3 parts close to each other in a careful manner with lasers, beam splitters and barium crystals, researchers were able to create qutrit and generate entanglement.

The system produced a fidelity of 0.75 over a measurement of 12 states which is an accurate result. The setup remained slow and inefficient but has shown that quantum teleportation is possible. Daniel Garisto reports in Scientific American, that another group of scientists have recorded teleportation across 10 states but their work has not yet been accepted by a peer-reviewed journal. They would also upgrade their systems in the future maybe even to the heights of ququarts.

Researchers mentioned that their work provides a complete toolbox for teleporting a particle in an intact manner by combining previous methods of teleportation of two-particle systems and multiple degrees of freedom. The scientists expect their results will pave way for quantum technology applications in higher dimensions since teleportation plays a central role in quantum networks and repeaters.

Journal Reference: arxiv