Continuous variable quantum teleportation through turbulent channels

Abstract

The turbulence channel, as a potential medium for communications, plays a major role in establishing global quantum networks. However, the weather-tunable channel parameters have an influence on performance of quantum communication system. In this paper, we consider effects of weather conditions on attenuation of the transmission of turbulent channel and thus on performance of continuous variable quantum teleportation (CVQT). The serious weather conditions that involve snow, rain, fog and haze have been employed for security analysis of the practical system. Moreover, a linear optical amplifier is used for performance improvement in terms of the fidelity and transmission distance as well. The simulation results show that the noiseless linear optical amplifier can increase the fidelity and maximal transmission distance of the CVQT system that involves serious weather conditions. This has certain reference guides significance for information transmission in the face of various extreme weathers.

Machine Learning Assisted Prediction for Free-Space Continuous Variable Quantum Teleportation

“…The parameters for numerical simulation are shown in Table I. It is worth noting that the selection of relevant parameters is similar to our previous work [13], [31], [38].…”

Free-Space Quantum Teleportation with Orbital Angular Momentum Multiplexed Continuous Variable Entanglement

“…Given that three degrees of freedom-amplitude, phase, and OAM-of the quantum state are considered in our scheme, the fidelity of the unknown input state can be calculated from the product of the fidelity in terms of the three degrees of freedom. Assuming that the input state is a coherent state, the fidelity in terms of amplitude and phase quadratures can be expressed as [18,24]…”

“…However, most of the current research has focused on improving the fidelity of the teleported quantum state and increasing the scale of communication distance. Typically, non-Gaussian entangled sources, arising from operations such as photon addition and subtraction [12,13], photon catalysis [14], and noiseless quantum amplification [15][16][17][18], were used in CVQT protocols to improve system fidelity. Otherwise, non-traditional coherent state sources such as discrete variable sources [19,20], spin coherent states [21], and thermal states [22] were also employed to achieve this goal.…”

“…On this basis, Wen et al proposed to further increase the secure communication distance while improving the system fidelity with methods such as photon catalysis and noiseless linear amplification [14,15]. Similarly, Wu and Xu et al proposed that the fidelity and transmission distance of CVQT systems in underwater and turbulent atmospheric channels can be improved using noiseless linear amplifier, respectively [17,18]. Furthermore, Zuo et al theoretically demonstrated the realisability of the CVQT protocol in a ground-to-satellite uplink, thereby extending the transmission distance to the hundreds of kilometres scale [24].…”

Hierarchical controlled cyclic quantum teleportation

“…In 1999, Karlsson and Borennane proposed Controlled Quantum Teleportation (CQT) to control the implementation of teleportation, where the teleportation of quantum states is performed under the control of all controllers [11]. CQT can be used for some special cases, such as approved transmission of secret information, network security meetings, etc Subsequently, people utilized quantum entanglement to construct different quantum channels and proposed many schemes for the teleportation of single-qubit quantum states, two-qubit quantum states, or multi-qubit quantum states [12][13][14][15][16][17]. At the same time, there are also numerous research accomplishments in experimental quantum teleportation [3,[18][19][20][21], high-dimensional quantum teleportation [22,23], and teleportation in noisy environments [24][25][26].…”