Quantum computation and quantum information
Quantum computation and quantum information
Secure direct communication based on ping---pong protocol
Quantum Information Processing
Experimental realization of entangled qutrits for quantum communication
Quantum Information & Computation
Quantum direct communication with mutual authentication
Quantum Information & Computation
Security of ping-pong protocol based on pairs of completely entangled qudits
Quantum Information Processing
Improving security of the ping-pong protocol
Quantum Information Processing
Increasing the security of the ping---pong protocol by using many mutually unbiased bases
Quantum Information Processing
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The non-coherent attack on the ping-pong protocol with completely entangled pairs of three-dimensional quantum systems (qutrits) is analyzed. The expression for the amount of the eavesdropper's information as functions of attack detection probability is derived. It is shown that the security of the ping-pong protocol with pairs of qutrits is higher than the security of the protocol with pairs of qubits. It is also shown that with the use by legitimate users in a control mode of two mutually unbiased measuring bases, the ping-pong protocol with pairs of qutrits possesses only asymptotic security, as well as the protocol with entangled qubits.