Austrian and Chinese scientists have succeeded in teleporting three-dimensional quantum states for the first time. High-dimensional teleportation could play an important role in future quantum computers.
Researchers from the Academy of Sciences and the University of Vienna have experimentally demonstrated what was previously only a theoretical possibility. Together with quantum physicists from the University of Science and Technology of China, they have succeeded in teleporting complex high-dimensional quantum states. The research teams report Physical Review Letters .
In their study, the researchers teleported the quantum state of one photon (light particle) to another distant one. Previously, only two-level states ("qubits") had been transmitted, i.e., information with values "0" or "1
Novel experimental method
It has been known since the 1990s that multidimensional quantum teleportation is theoretically possible. However: "First, we had to design an experimental method for implementing high-dimensional teleportation, as well as to develop the necessary technology", says Manuel Erhard from the Vienna Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences.  The quantum state to be teleported is encoded in the possible paths a photon can take. One can picture these paths as three optical fibers. Most interestingly, in quantum physics a single photon can also be located in all three optical fibers at the same time. To teleport this three-dimensional quantum state, the researchers used a new experimental method. The core of quantum teleportation is the so-called Bell measurement. It is based on a multiport beam splitter, which directs photons through several inputs and outputs and connects all optical fibers together.
Through clever selection of certain interference patterns, the quantum information can be transmitted to another photon far from the input photon, without the two ever physically interacting. Erhard emphasizes.
Higher information capacities for quantum computers
With this, the international research team has thus made an important step towards practical applications such as a future quantum internet, since high-dimensional quantum systems can transport large amounts of information than qubits. Anton Zeilinger, quantum physicist at the Austrian Academy of Sciences and University of Vienna, says "This result could help to connect quantum computers with information beyond qubits."
The participating Chinese researchers So see great opportunities in multidimensional quantum teleportation. "The basics for next-generation quantum network systems is built on our foundational research today," says Jian-Wei Pan of the University of Science and Technology of China.
In future work, the quantum physicists will focus on how to extend the knowledge to enable the teleportation of the entire quantum state of a single photon or atom.
One step closer to complex quantum teleportation
Yi-Han Luo et al. Quantum Teleportation in High Dimensions, Physical Review Letters (2019). DOI: 10.1103 / PhysRevLett.123.070505
Complex quantum teleportation achieved for the first time (2019, August 23)
retrieved 23 August 2019
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