11,865 research outputs found
Quantum cryptography: key distribution and beyond
Uniquely among the sciences, quantum cryptography has driven both
foundational research as well as practical real-life applications. We review
the progress of quantum cryptography in the last decade, covering quantum key
distribution and other applications.Comment: It's a review on quantum cryptography and it is not restricted to QK
Quantum Communication Uplink to a 3U CubeSat: Feasibility & Design
Satellites are the efficient way to achieve global scale quantum
communication (Q.Com) because unavoidable losses restrict fiber based Q.Com to
a few hundred kilometers. We demonstrate the feasibility of establishing a
Q.Com uplink with a tiny 3U CubeSat (measuring just 10X10X32 cm^3 ) using
commercial off-the-shelf components, the majority of which have space heritage.
We demonstrate how to leverage the latest advancements in nano-satellite
body-pointing to show that our 4kg CubeSat can provide performance comparable
to much larger 600kg satellite missions. A comprehensive link budget and
simulation was performed to calculate the secure key rates. We discuss design
choices and trade-offs to maximize the key rate while minimizing the cost and
development needed. Our detailed design and feasibility study can be readily
used as a template for global scale Q.Com.Comment: 24 pages, 9 figures, 2 tables. Fixed tables and figure
Classical light vs. nonclassical light: Characterizations and interesting applications
We briefly review the ideas that have shaped modern optics and have led to
various applications of light ranging from spectroscopy to astrophysics, and
street lights to quantum communication. The review is primarily focused on the
modern applications of classical light and nonclassical light. Specific
attention has been given to the applications of squeezed, antibunched, and
entangled states of radiation field. Applications of Fock states (especially
single photon states) in the field of quantum communication are also discussed.Comment: 32 pages, 3 figures, a review on applications of ligh
Quantum information with continuous variables
Quantum information is a rapidly advancing area of interdisciplinary
research. It may lead to real-world applications for communication and
computation unavailable without the exploitation of quantum properties such as
nonorthogonality or entanglement. We review the progress in quantum information
based on continuous quantum variables, with emphasis on quantum optical
implementations in terms of the quadrature amplitudes of the electromagnetic
field.Comment: accepted for publication in Reviews of Modern Physic
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