Counterfactual Quantum Cryptography

Counterfactual quantum cryptography.

Quantum cryptography allows one to distribute a secret key between two remote parties using the fundamental principles of quantum mechanics. The well-known established paradigm for the quantum key distribution relies on the actual transmission of signal particle through a quantum channel. In this Letter, we show that the task of a secret key distribution can be accomplished even though a partic...

Quantum Bit Commitment Protocol Based on Counterfactual Quantum Cryptography

We present a new quantum bit commitment (QBC) protocol based on counterfactual quantum cryptography. We analyze the security of this protocol, find that it can resist the attack presented by QBC’s no-go theorem. Our protocol is simple, and probably gives a new way of constructing QBC protocol.

“Counterfactual” quantum protocols

The counterfactuality of recently proposed protocols is analyzed. A definition of ‘counterfactuality’ is offered and it is argued that an interaction-free measurement of the presence of an opaque object can be named ‘counterfactual’, while proposed “counterfactual” measurements of the absence of such objects are not counterfactual. The quantum key distribution protocols which rely only on measu...

Quantum Cryptography

Quantum cryptography

This is a chapter on quantum cryptography for the book “A Multidisciplinary Introduction to Information Security” to be published by CRC Press in 2011/2012. The chapter aims to introduce the topic to undergraduate-level and continuing-education students specializing in information and communication technology.