Tightening the eavesdropping accessible information for continuous variable quantum key distribution protocols that involve non-maximally entanglement

Secure Quantum Telephones

We propose in this paper a novel deterministic protocol using particular maximally entangled states of polarized photons for a genuine bidirectional secure communication setup. We further propose a plausible experimental setup for such a protocol using currently available optical technology which liberates two communicating party from sharing identical apparatus. We note that security of the protocol is promised by the monogamous nature of maximally entangled states. We discuss the security of our protocol in the light of some simple eavesdropping scenarios.

Deterministic secure quantum communication without maximally entangled states

Two deterministic secure quantum communication schemes are proposed, one based on pure entangled states and the other on $d$-dimensional single-photon states. In these two schemes, only single-photon measurements are required for the two authorized users, which makes the schemes more convenient than others in practical applications. Although each qubit can be read out after a transmission of additional classical bit, it is unnecessary for the users to transmit qubits double the distance between the sender and the receiver, which will increase their bit rate and their security. The parties use …

量子密码对抗纠缠测量攻击的安全性证明

Security proof for quantum cryptography against entanglement-measurement attack

本文提出利用两种窃听检查方法证明量子密码对抗纠缠测量攻击的安全性，通过最大纠缠态协议演示证明过程。

Quasi-deterministic secure quantum communication using non-maximally entangled states

Quantum communication in general helps deter potential eavesdropping in the course of transmission of bits to enable secure communication between two or more parties. In this paper, we propose a novel quasi-deterministic secure quantum communication scheme using non-maximally entangled states. The proposed scheme follows a simple procedure, and cases where the entanglement required can be significantly reduced to carry out the protocol successfully are discussed. Long sequences or the whole sequence of data can be sent after error checking for a potential eavesdropper. The maximum qubit effici…

Semi-quantum secret sharing using entangled states

Secret sharing is a procedure for sharing a secret among a number of participants such that only the qualified subsets of participants have the ability to reconstruct the secret. Even in the presence of eavesdropping, secret sharing can be achieved when all the members are quantum. So what happens if not all the members are quantum? In this paper we propose two semi-quantum secret sharing protocols using maximally entangled GHZ-type states in which quantum Alice shares a secret with two classical parties, Bob and Charlie, in a way that both parties are sufficient to obtain the secret, but one …

四元压缩量子身份认证：基于单模压缩光的方向缩放安全性

Quaternary-Squeeze Quantum Identity Authentication: Direction-Scaling Security via Single-Mode Squeezed Light

本文针对量子身份认证提出基于压缩光场非经典特性的协议，利用正交压缩相干态特性及诱饵态保真度参数等，能抗高斯克隆攻击、检测窃听，四方向压缩可提高安全阈值，相比二元压缩协议有优势，便于实际应用。