Plasmonic Nanobar-on-Mirror Antenna with Giant Local Chirality: a New Platform for Ultrafast Chiral Single-Photon Emission

Providing an additional degree of freedom for binary information encoding and nonreciprocal information transmission, chiral single photons have become a new research frontier in quantum optics. Without using complex external...

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Chaotic Quantum Key Distribution

Cryptography ◽

10.3390/cryptography4030024 ◽

2020 ◽

Vol 4 (3) ◽

pp. 24

Author(s):

Noah Cowper ◽

Harry Shaw ◽

David Thayer

Keyword(s):

Quantum Computing ◽

Quantum Key Distribution ◽

Single Photon ◽

Photon Emission ◽

Key Distribution ◽

Maximum Amount ◽

Single Photons ◽

Single Photon Emission ◽

Amount Of Information ◽

Communication Scheme

The ability to send information securely is a vital aspect of today’s society, and with the developments in quantum computing, new ways to communicate have to be researched. We explored a novel application of quantum key distribution (QKD) and synchronized chaos which was utilized to mask a transmitted message. This communication scheme is not hampered by the ability to send single photons and consequently is not vulnerable to number splitting attacks like other QKD schemes that rely on single photon emission. This was shown by an eavesdropper gaining a maximum amount of information on the key during the first setup and listening to the key reconciliation to gain more information. We proved that there is a maximum amount of information an eavesdropper can gain during the communication, and this is insufficient to decode the message.

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On-demand spin-state manipulation of single-photon emission from quantum dot integrated with metasurface

Science Advances ◽

10.1126/sciadv.aba8761 ◽

2020 ◽

Vol 6 (31) ◽

pp. eaba8761

Author(s):

Yanjun Bao ◽

Qiaoling Lin ◽

Rongbin Su ◽

Zhang-Kai Zhou ◽

Jindong Song ◽

...

Keyword(s):

Quantum Dot ◽

Information Science ◽

Single Photon ◽

Photon Emission ◽

Mirror Image ◽

Single Photons ◽

Spin States ◽

Single Photon Emission ◽

On Demand ◽

On Chip

The semiconductor quantum dot (QD) has been successfully demonstrated as a potentially scalable and on-chip integration technology to generate the triggered photon streams that have many important applications in quantum information science. However, the randomicity of these photon streams emitted from the QD seriously compromises its use and especially hinders the on-demand manipulation of the spin states. Here, by accurately integrating a QD and its mirror image onto the two foci of a bifocal metalens, we demonstrate the on-demand generation and separation of the spin states of the emitted single photons. The photon streams with different spin states emitted from the QD can be flexibly manipulated to propagate along arbitrarily designed directions with high collimation of the smallest measured beaming divergence angle of 3.17°. Our work presents an effectively integrated quantum method for the simultaneously on-demand manipulation of the polarization, propagation, and collimation of the emitted photon streams.

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