Single-photon-level spatial-mode-selective frequency up-conversion in a multimode χ(2) waveguide

2017 ◽  
Author(s):  
Y. B. Kwon ◽  
M. Giribabu ◽  
C. Langrock ◽  
M. M. Fejer ◽  
M. Vasilyev
Keyword(s):  
Single Photon ◽  
Spatial Mode

Spatial Light Modulators: Single-Photon, Spatial-Mode Analyzers

2011 ◽  
Author(s):  
M. J. Padgett ◽  
J. Leach ◽  
B. Jack ◽  
J. Romero ◽  
D. Giovannini ◽  
...  
Keyword(s):  
Single Photon ◽  
Spatial Light Modulators ◽  
Spatial Mode ◽  
Light Modulators

Controlled quantum secure communication protocol with single photons in both polarization and spatial-mode degrees of freedom

2016 ◽  
Vol 30 (05) ◽  
pp. 1650051 ◽  
Author(s):  
Lili Wang ◽  
Wenping Ma
Keyword(s):  
Secure Communication ◽  
Degrees Of Freedom ◽  
Communication Protocol ◽  
Single Photon ◽  
Quantum Secure Direct Communication ◽  
Single Photons ◽  
Spatial Mode ◽  
The Third ◽  
Quantum Secure Communication ◽  
The Cost

In this paper, we propose a new controlled quantum secure direct communication (CQSDC) protocol with single photons in both polarization and spatial-mode degrees of freedom. Based on the defined local collective unitary operations, the sender’s secret messages can be transmitted directly to the receiver through encoding secret messages on the particles. Only with the help of the third side, the receiver can reconstruct the secret messages. Each single photon in two degrees of freedom can carry two bits of information, so the cost of our protocol is less than others using entangled qubits. Moreover, the security of our QSDC network protocol is discussed comprehensively. It is shown that our new CQSDC protocol cannot only defend the outsider eavesdroppers’ several sorts of attacks but also the inside attacks. Besides, our protocol is feasible since the preparation and the measurement of single photon quantum states in both the polarization and the spatial-mode degrees of freedom are available with current quantum techniques.

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