Researchers at the National Institute of Standards and Technology (NIST) have “teleported” or transferred quantum information carried in light particles over 100 kilometers of optical fiber, 4X farther than the previous record. The experiment confirmed that quantum communication is feasible over long distances in fiber. Other research groups have teleported quantum information over longer distances in free space, but the ability to do so over conventional fiber-optic lines offers more flexibility for network design.
Teleportation is useful in both quantum communications and quantum computing, which offer prospects for novel capabilities such as unbreakable encryption and advanced code-breaking, respectively.
The new record, described in Optica, involved the transfer of quantum information contained in one photon—its specific time slot in a sequence— to another photon transmitted over 102 km of spooled fiber in a NIST laboratory in Colorado. The achievement was made possible by advanced single-photon detectors.
“Only about 1% of photons make it all the way through 100 km of fiber,” NIST’s Marty Stevens says. “We never could have done this experiment without these new detectors, which can measure this incredibly weak signal.”
Until now, so much quantum data was lost in fiber that transmission rates and distances were low. The new NTT/NIST teleportation technique could be used to make devices called quantum repeaters that could resend data periodically in order to extend network reach, perhaps enough to eventually build a “quantum internet.”
The teleportation method is novel in that four of NIST’s photon detectors were positioned to filter out specific quantum states. The detectors rely on superconducting nanowires made of molybdenum silicide. They can record more than 80% of arriving photons, revealing whether they are in the same or different time slots each just 1 nanosecond long. The experiments were performed at wavelengths commonly used in telecommunications.
Because the experiment filtered out and focused on a limited combination of quantum states, teleportation could be successful in only 25% of the transmissions at best. Thanks to the efficient detectors, researchers successfully teleported the desired quantum state in 83% of the maximum possible successful transmissions, on average. All experimental runs with different starting properties exceeded the mathematically significant 66.7% threshold for proving the quantum nature of the teleportation process. http://www.nist.gov/pml/nist-team-breaks-distance-record-for-quantum-teleportation.cfm
This graphic describes how researchers at the National Institute of Standards and Technology (NIST) have “teleported” or transferred quantum information carried in light particles over 100 kilometers (km) of optical fiber, four times farther than the previous record. Credit: K. Irvine/NIST
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