Indoor channel modeling for continuous variable quantum key distribution in the terahertz band

He, Yuxin; Mao, Yiyu; Huang, Duan; Liao, Qin; Guo, Ying

doi:10.1364/oe.405020

Cited by 19 publications

(10 citation statements)

References 51 publications

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“…In (1), l = 1 corresponds to the lineof-sight (LoS) path and l > 1 denote the non-LoS (NLoS) multipath components. The path losses are modelled as [5] γ…”

Section: System Modelmentioning

confidence: 99%

“…The asymptotic secret key rates of a single-input single-output (SISO) CVQKD system operating at room temperature in the THz band was characterized in [4], which was further extended for an intersatellite THz link operating at cryogenic temperature in [8]. A ray-tracing based SISO channel model for indoor THz CVQKD systems was developed in [5]. The authors of [9] have proposed a MIMO architecture to improve the secret key rates of DVQKD in a free-space optical communication system.…”

Section: Introductionmentioning

confidence: 99%

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MIMO Terahertz Quantum Key Distribution

et al. 2021

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We propose a multiple-input multiple-output (MIMO) quantum key distribution (QKD) scheme for terahertz (THz) frequency applications operating at room temperature. Motivated by classical MIMO communications, a transmitreceive beamforming scheme is proposed that converts the rankr MIMO channel between Alice and Bob into r parallel lossy quantum channels. Compared with existing single-antenna QKD schemes, we demonstrate that the MIMO QKD scheme leads to performance improvements by increasing the secret key rate and extending the transmission distance. Our simulation results show that multiple antennas are necessary to overcome the high free-space path loss at THz frequencies. We demonstrate a nonmonotonic relation between performance and frequency, and reveal that positive key rates are achievable in the 10 − 30 THz frequency range. The proposed scheme can be used for both indoor and outdoor QKD applications for beyond fifth generation ultra-secure wireless communications systems.

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“…In (1), l = 1 corresponds to the lineof-sight (LoS) path and l > 1 denote the non-LoS (NLoS) multipath components. The path losses are modelled as [5] γ…”

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MIMO Terahertz Quantum Key Distribution

et al. 2021

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“…where d t , d r are the inter-antenna spacings at Alice's and Bob's ULAs, respectively, and λ denotes the wavelength of the carrier signal. In the channel model (1), γ l denotes the path loss which can be modelled as [55]…”

Section: A Channel Modelmentioning

confidence: 99%

Channel Estimation and Secret Key Rate Analysis of MIMO Terahertz Quantum Key Distribution

Kundu¹,

Dash²,

McKay³

et al. 2021

Preprint

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We study the secret key rate (SKR) of a multiple-input multiple-output (MIMO) continuous variable quantum key distribution (CVQKD) system operating at terahertz (THz) frequencies, accounting for the effects of channel estimation. We propose a practical channel estimation scheme for the THz MIMO CVQKD system which is necessary to realize transmit-receive beamforming between Alice and Bob.We characterize the input-output relation between Alice and Bob during the key generation phase, by incorporating the effects of additional noise terms arising due to the channel estimation error and detector noise. Furthermore, we analyze the SKR of the system and study the effect of channel estimation error and overhead. Our simulation results reveal that the SKR may degrade significantly as compared to the SKR upper bound that assumes perfect channel state information, particularly at large transmission distances.

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“…; and compared with the microwave communication, it has larger capacity and better directionality. However, THz communication has a fatal weakness in the atmosphere, that is, it is easily absorbed by the pervasive atmospheric water molecules, which severely limits its communication distance [ 20 , 21 ]. Fortunately, THz communication is feasible in inter-satellite links since the concentration of water molecules there can be negligible and a previous work has studied the feasibility [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Continuous-Variable Quantum Secret Sharing Based on Thermal Terahertz Sources in Inter-Satellite Wireless Links

Liu

Zhu

et al. 2021

Entropy

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We propose a continuous-variable quantum secret sharing (CVQSS) scheme based on thermal terahertz (THz) sources in inter-satellite wireless links (THz-CVQSS). In this scheme, firstly, each player locally preforms Gaussian modulation to prepare a thermal THz state, and then couples it into a circulating spatiotemporal mode using a highly asymmetric beam splitter. At the end, the dealer measures the quadrature components of the received spatiotemporal mode through performing the heterodyne detection to share secure keys with all the players of a group. This design enables that the key can be recovered only by the whole group players’ knowledge in cooperation and neither a single player nor any subset of the players in the group can recover the key correctly. We analyze both the security and the performance of THz-CVQSS in inter-satellite links. Results show that a long-distance inter-satellite THz-CVQSS scheme with multiple players is feasible. This work will provide an effective way for building an inter-satellite quantum communication network.

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Indoor channel modeling for continuous variable quantum key distribution in the terahertz band

Cited by 19 publications

References 51 publications

MIMO Terahertz Quantum Key Distribution

MIMO Terahertz Quantum Key Distribution

Channel Estimation and Secret Key Rate Analysis of MIMO Terahertz Quantum Key Distribution

Continuous-Variable Quantum Secret Sharing Based on Thermal Terahertz Sources in Inter-Satellite Wireless Links

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