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Teleportasi kuantum : Rekor dunia dari 100 kilometer

Date:

September 22, 2015

Source:

National Institute of Standards and Technology (NIST)

Summary:

Para peneliti telah bisa  ' teleport ' atau informasi kuantum ditransfer  yang dilakukan di partikel cahaya lebih dari 100 kilometer ( km ) dari serat optik , empat kali lebih jauh dari rekor sebelumnya .

.......... Percobaan menegaskan bahwa komunikasi kuantum bisa pada  jarak jauh di serat . Kelompok penelitian lain telah men teleport informasi kuantum jarak yang lebih jauh dalam ruang bebas , tetapi kemampuan untuk melakukannya melalui saluran serat optik konvensional menawarkan lebih banyak fleksibilitas untuk desain jaringan .

Tidak  akan menjadi bingung dengan fiksi Star Trek  " beaming  up " manusia , teleportasi kuantum melibatkan transfer , atau remote rekonstruksi  , dari informasi yang dikodekan dalam keadaan kuantum dari materi atau cahaya .....more

Quantum
teleportation: World record of 100 kilometers

Date:

September 22, 2015

Source:

National Institute of Standards and Technology (NIST)

Summary:

Researchers have 'teleported' or transferred quantum information carried in
light particles over 100 kilometers (km) of optical fiber, four times farther
than the previous record.

..................

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. 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.







Story Source:

The above post is reprinted from materials provided byNational
Institute of Standards and Technology (NIST).Note: Materials
may be edited for content and length.







Journal Reference:

1.   
Hiroki Takesue, Shellee D. Dyer, Martin J. Stevens, Varun Verma, Richard P.
Mirin, Sae Woo Nam. Quantum teleportation over 100  km of fiber using highly efficient superconducting nanowire single-photon detectors. Optica,
2015; 2 (10): 832 DOI:10.1364/OPTICA.2.000832

http://www.sciencedaily.com/releases/2015/09/150922114740.htm

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