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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 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.Quanta 2017; 6: 1–47
Secure Key from Quantum Discord
The study of quantum information processing seeks to characterize the
resources that enable quantum information processing to perform tasks that are
unfeasible or inefficient for classical information processing. Quantum
cryptography is one such task, and researchers have identified entanglement as
a sufficient resource for secure key generation. However, quantum discord,
another type of quantum correlation beyond entanglement, has been found to be
necessary for guaranteeing secure communication due to its direct relation to
information leakage. Despite this, it is a long-standing problem how to make
use of discord to analyze security in a specific quantum cryptography protocol.
Here, based on our proposed quantum discord witness recently, we successfully
address this issue by considering a BB84-like quantum key distribution protocol
and its equivalent entanglement-based version. Our method is robust against
imperfections in qubit sources and qubit measurements as well as basis
misalignment due to quantum channels, which results in a better key rate than
standard BB84 protocol. Those advantages are experimentally demonstrated via
photonic phase encoding systems, which shows the practicality of our results
The Case for Quantum Key Distribution
Quantum key distribution (QKD) promises secure key agreement by using quantum
mechanical systems. We argue that QKD will be an important part of future
cryptographic infrastructures. It can provide long-term confidentiality for
encrypted information without reliance on computational assumptions. Although
QKD still requires authentication to prevent man-in-the-middle attacks, it can
make use of either information-theoretically secure symmetric key
authentication or computationally secure public key authentication: even when
using public key authentication, we argue that QKD still offers stronger
security than classical key agreement.Comment: 12 pages, 1 figure; to appear in proceedings of QuantumComm 2009
Workshop on Quantum and Classical Information Security; version 2 minor
content revision
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