{"id":94122,"date":"2015-03-20T10:54:22","date_gmt":"2015-03-20T14:54:22","guid":{"rendered":"http:\/\/www.rochester.edu\/newscenter\/?p=94122"},"modified":"2019-11-13T12:54:18","modified_gmt":"2019-11-13T17:54:18","slug":"new-approach-uses-twisted-light-to-increase-the-efficiency-of-quantum-cryptography-systems-94122","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/new-approach-uses-twisted-light-to-increase-the-efficiency-of-quantum-cryptography-systems-94122\/","title":{"rendered":"New approach uses \u201ctwisted light\u201d to increase the efficiency of quantum cryptography systems"},"content":{"rendered":"

Researchers demonstrate how to encode 2.05 bits per photon, doubling existing systems that use light polarization<\/h2>\n

Researchers at the University of Rochester and their collaborators have developed a way to transfer 2.05 bits per photon by using \u201ctwisted light.\u201d This remarkable achievement is possible because the researchers used the orbital angular momentum of the photons to encode information, rather than the more commonly used polarization of light. The new approach doubles the 1 bit per photon that is possible with current systems that rely on light polarization and could help increase the efficiency of quantum cryptography systems.<\/p>\n

Quantum cryptography promises more secure communications. The first step in such systems is quantum key distribution (QKD), to ensure that both the sender and receiver \u2013 usually referred to as Alice and Bob \u2013 are communicating in such a way that only they know what is being sent. They are the only ones who hold the \u201ckey\u201d to the messages, and the systems are set up in such a way that the presence of any eavesdropper would be identified.<\/p>\n

In the paper, published in New Journal of Physics<\/em> <\/a>today, Mohammad Mirhosseini and his colleagues describe a proof-of-principle experiment that shows that using OAM to encode information rather than polarization opens up the possibility of high-dimensional QKD. Mirhosseini, a Ph.D. student in Robert W. Boyd\u2019s group at the University of Rochester\u2019s Institute of Optics, explains that they were able to encode a seven dimensional \u201calphabet\u201d \u2013 that is, seven letters or symbols \u2013 using both the orbital angular momentum (OAM) of the photons and their angular position (ANG). These two properties of the photons form what physicists refer to as mutually unbiased bases, a requirement for QKD. Using mutually unbiased bases, the correct answer is revealed only if Alice encodes the information using a particular basis and Bob measures in that same basis.<\/p>\n

In QKD, once they have generated a long, shared key, Alice and Bob publicly announce the basis (or \u201calphabet\u201d) they have used for each symbol in the key. They then compare what alphabet was used for sending and which one for receiving. They only keep the part of the key in which they have used the same \u201calphabet.\u201d The letters they keep produce a secure key, which they can use to encrypt messages and transmit these with regular encryption without the need for quantum cryptography.<\/p>\n

If for any reason their communication is intercepted, because of a fundamental property of quantum mechanics, there will be discrepancies between Alice and Bob\u2019s keys. To check for this, Alice and Bob sacrifice a short part of their key. They share this publicly and identify any discrepancies. This lets them know whether their connection is secure and, if not, they will stop the communication.<\/p>\n

The researchers showed that using their system they were able to generate and detect information at a rate of 4kHz and with 93% accuracy. A long term goal of the research is to realize secure communications at GHz transmission rates, which is desirable for telecommunication applications.<\/p>\n

\u201cOur experiment shows that it is possible to use \u201ctwisted light\u201d for QKD and that it doubles the capacity compared to using polarization,\u201d said Mirhosseini. \u201cUnlike with polarization, where it is impossible to encode more than one bit per photon, \u201ctwisted light\u201d could make it possible to encode several bits, and every extra bit of information encoded in a photon means fewer photons to generate and measure.\u201d<\/p>\n

In a previous experiment using a strong laser beam instead of single photons, Boyd\u2019s team were able to measure up to 25 modes of OAM and ANG. This is equivalent to having 25 letters available in your \u201calphabet\u201d rather than 7. This shows the potential for a system like the one described in the new paper to have the capacity to transmit and measure 4.17 bits per photon using more sophisticated equipment.<\/p>\n

Mirhosseini acknowledges that the real-world challenges are not straightforward to overcome but when it comes to QKD, he is excited about the possibilities their system opens up.<\/p>\n

Mirhosseini\u2019s collaborators included his colleagues O. S. Magana-Loaiza, M. N. O\u2019Sullivan, B. Rodenburg, M. Malik (now at the IQOQI in Vienna), and advisor Robert W. Boyd (who also holds the Canada Excellence Research Chair in Quantum Nonlinear Optics at the University of Ottawa) at the University of Rochester; M. P. J. Lavery and M. J. Padgett from the University of Glasgow; and D. J. Gauthier from Duke University. The researchers acknowledge funding from the Defense Threat Reduction Agency and the Defense Advanced Reearch Projects Agency.<\/p>\n

The Institute of Optics is part of the University of Rochester\u2019s Hajim School of Engineering and Applied Sciences.<\/p>\n","protected":false},"excerpt":{"rendered":"

Rochester researchers and their collaborators have developed a way to transfer 2.05 bits per photon by using \u201ctwisted light.\u201d The new approach doubles the 1 bit per photon that is possible with current systems that rely on light polarization and could help increase the efficiency of quantum cryptography systems.<\/p>\n","protected":false},"author":6,"featured_media":94412,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[18652,37312,7496,18572,19062,16072],"class_list":["post-94122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-institute-of-optics","tag-materials-science-program","tag-photonics","tag-research-finding","tag-robert-boyd","tag-school-of-arts-and-sciences"],"acf":[],"yoast_head":"\nNew approach uses \u201ctwisted light\u201d to increase the efficiency of quantum cryptography 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