28 Aug 2013
Japanese-German team says hybrid technology enables transmission of photonic qubits.
The teams from Johannes Gutenberg University (JGU), Mainz, and the University of Tokyo are hailing the achievement as “a decisive breakthrough” after 15 years of such research since the first experiments in the field of optical teleportation. A qubit is a unit of quantum information — the quantum equivalent of the electronic bit.
The success of the experiment, which was conducted in Tokyo, is attributable to the use of a hybrid technique in which two conceptually different and previously incompatible approaches were combined.
JGU’s Professor Peter van Loock commented, “Discrete digital optical quantum information can now be transmitted continuously – at the touch of a button. Quantum teleportation is of fundamental importance to the processing of quantum information such as for quantum computing and quantum communication.”
As a theoretical physicist, van Loock advised the experimental physicists in the Tokyo research team headed by Professor Akira Furusawa on how they could most efficiently perform the teleportation experiment to prove the success of quantum teleportation. The findings have now been published in Nature.
Quantum teleportation involves the transfer of arbitrary quantum states from a sender, dubbed “Alice”, to a spatially distant receiver, named “Bob”. This requires that Alice and Bob initially share an entangled quantum state across the space in question, such as in the form of entangled photons
Photons are considered to be ideal information carriers for quantum communication since they can be used to transmit signals at the speed of light. A photon can represent a quantum bit or qubit analogous to a binary digit (bit) in standard classical information processing. Such photons are known as "flying quantum bits".
The first attempts to teleport single photons or light particles were made by the Austrian physicist Anton Zeilinger. Various other related experiments have been performed in the meantime. However, teleportation of photonic quantum bits using conventional methods proved to have its limitations because of experimental deficiencies and difficulties with fundamental principles.
What makes the experiment in Tokyo so different from previous such work is the use of a hybrid technique. With its help, a completely deterministic and highly reliable quantum teleportation of photonic qubits has been achieved. The accuracy of the transfer was 79 to 82 percent for four different qubits. In addition, the qubits were teleported much more efficiently than in previous experiments, even at a low degree of entanglement.
The concept of entanglement was first formulated by Erwin Schrödinger and involves a situation in which two quantum systems, such as two light particles for example, are in a joint state, so that their behavior is mutually dependent to a greater extent than is normally (classically) possible. In the Tokyo experiment, continuous entanglement was achieved by means of entangling many photons with many other photons.
This meant that the complete amplitudes and phases of two light fields were quantum correlated. Previous experiments only had a single photon entangled with another single photon – a less efficient solution. van Loock added, "The entanglement of photons functioned very well in the Tokyo experiment – practically at the press of a button, as soon as the laser was switched on."
This continuous entanglement was accomplished with the aid of so-called "squeezed light", which takes the form of an ellipse in the phase space of the light field. Once entanglement has been achieved, a third light field can be attached to the transmitter. From there, in principle, any state and any number of states can be transmitted to the receiver.
"In our experiment, there were precisely four sufficiently representative test states that were transferred from Alice to Bob using entanglement. Thanks to continuous entanglement, it was possible to transmit the photonic qubits in a deterministic fashion to Bob, in other words, in each run," added van Loock.
He said that the team’s achievement represents a technological breakthrough that this has actually now been experimentally demonstrated with the help of the hybrid technique. "The two separate worlds, the discrete and the continuous, are starting to converge," concluded van Loock.
About the Author
Matthew Peach is a contribting editor to optics.org.
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