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.
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.
Not to be confused with Star Trek’s fictional “beaming up” of people, quantum teleportation involves the transfer, or remote reconstruction, of information encoded in quantum states of matter or light. 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 basic method for quantum teleportation was first proposed more than 20 years ago and has been performed by a number of research groups, including one at NIST using atoms in 2004.
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 lead author, Hiroki Takesue, was a NIST guest researcher from NTT Corp. in Japan. The achievement was made possible by advanced single-photon detectors designed and made at NIST.
“Only about 1 percent 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.” Previously, researchers thought quantum repeaters might need to rely on atoms or other matter, instead of light, a difficult engineering challenge that would also slow down transmission.
Various quantum states can be used to carry information; the NTT/NIST experiment used quantum states that indicate when in a sequence of time slots a single photon arrives. The teleportation method is novel in that four of NIST’s photon detectors were positioned to filter out specific quantum states. (See graphic for an overview of how the teleportation process works.) The detectors rely on superconducting nanowires made of molybdenum silicide.** They can record more than 80 percent 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 percent of the transmissions at best. Thanks to the efficient detectors, researchers successfully teleported the desired quantum state in 83 percent of the maximum possible successful transmissions, on average. All experimental runs with different starting properties exceeded the mathematically significant 66.7 percent threshold for proving the quantum nature of the teleportation process.
The Latest on: Quantum teleportation
via Google News
The Latest on: Quantum teleportation
- Long March 2D launches world’s first quantum communications satelliteon April 22, 2020 at 5:00 pm
Finally, the QSS plans to achieve Quantum Teleportation from ground to satellite as a totally new way of communication, quantum teleportation is the fundamental process of quantum networks and ...
- Physicists Think You Could Be Rescued from a Black Hole — But Don't Risk Iton April 12, 2020 at 5:00 pm
Now, physicists know that entanglement is real, and quantum teleportation is an almost routine part of physics research. Here's how quantum teleportation works: Entangle two light particles, A and B.
- The Top 6 Physics Stories of 2006on March 12, 2020 at 11:22 pm
Quantum teleportation is the process of making a subatomic particle's physical state vanish from one place and appear in another, a little like Captain Kirk's transporter. What makes this possible is ...
- quantum tunneling teleportationon January 10, 2020 at 7:04 pm
Quantum teleportation, more reliable than ever before, at greater distances than ever before. A commute so quick you could just die. Bringing us one step closer to a quantum Internet The quantum ...
- Creation of New Technology Aiming for the Realization of Quantum Information Processing Systemson August 30, 2019 at 10:25 am
Specifically, it targets technologies for basic devices based on quantum effects and the utilization of multiple quantum bits, quantum information transmission ... technology using atom clusters or ...
- Creation of New Technology Aiming for the Realization of Quantum Information Processing Systemson August 3, 2019 at 6:10 pm
quantum relay technology using atom clusters or quantum teleportation, quantum encryption technology using single photons or entangled photons, etc.
- Putin jokingly suggests Russia should develop teleportationon June 24, 2019 at 5:12 am
The document contained a mentioning of the plans for develop quantum teleportation. "Quite naturally, the journalists left the word ‘quantum’ out and wrote about the streamlining of ...
- PHY472 Advanced Quantum Mechanics (10 credits)on May 19, 2019 at 5:55 am
Quantum teleportation is used as an example to illustrate these concepts. Next, we develop the theory of angular momentum, examples of which include spin and isospin, and the method for calculating ...
- Quantum teleportation of two states of one photonon March 18, 2018 at 3:14 pm
In the process known as quantum teleportation, quantum information encoded in a quantum particle, for example a photon, is transferred from one place to the other without ever moving the photon.
via Bing News