Deterministic quantum key distribution protocols : development and security analysis

Basman Khaleel Mohammed, Mohammed M. Abdulmajeed

Quantum Key Distribution (QKD) is a secure communication that uses a quantum encryption protocol in quantum physics using the principle of quantum mechanics. It solves the problems of key distribution between the sender and receiver and uses a special quantum channel to transfer keys in classical computers and also in the field of quantum computing (QC) in the future. Various protocols are designed in quantum key distribution to ensure the security and integrity of data from any surveillance or attack from some eavesdroppers when sending quantum states (photons) through a special quantum communication channel. The analysis of the device is used in the effective simulation process using quantum entanglement technology. The use of OptiSystem software is a simulation application Optical is used in telecommunications. When using for 6DP in distributing quantum keys across the optical fiber channel, quantitative results appear in 6 using networking technology. We improved in the sifted key rate and the QBER rate. Through these results, we believe 6DP is more secure and reliable. For the rest of the protocols in the distribution of quantum keys using quantum entanglement.

Neha Agarwal, Vikas Verma

Hua Lu, Chi‐Hang Fred Fung, Xiongfeng Ma +1 more

In a deterministic quantum key distribution (DQKD) protocol with a two-way quantum channel, Bob sends a qubit to Alice who then encodes a key bit onto the qubit and sends it back to Bob. After measuring the returned qubit, Bob can obtain Alice's key bit immediately, without basis reconciliation. Since an eavesdropper may attack the qubits traveling on either the Bob-Alice channel or the Alice-Bob channel, the security analysis of DQKD protocol with a two-way quantum channel is complicated and its unconditional security has been controversial. This paper presents a security proof of a single-photon four-state DQKD protocol against general attacks.

Nanrun Zhou, Lijun Wang, Jie Ding +2 more

Ivan Henao, Roberto M. Serra

Within the broad research scenario of quantum secure communication, two-way quantum key distribution (TWQKD) is a relatively new proposal for sharing secret keys that is not yet fully explored. We analyze the security of TWQKD schemes that use qubits prepared in nonorthogonal states to transmit the key. Investigating protocols that employ an arbitrary number of bases for the channel preparation, we show, in particular, that the security of the LM05 protocol cannot be improved by the use of more than two preparation bases. We also provide an alternative proof of unconditional security for a deterministic TWQKD protocol recently proposed in Beaudry et al., Phys. Rev. A 88, 062302 (2013). In addition, we introduce a deterministic protocol named ``TWQKD six-state'' and compute an analytical lower bound (which can be tightened) for the maximum amount of information that an eavesdropper could extract in this case. An interesting advantage of our approach to the security analysis of TWQKD is the great simplicity and transparency of the derivations.

Sheila Cobourne