Noisy propagation of Gaussian states in optical media with finite bandwidth

Teklu, Berihu; Bina, Matteo; Paris, Matteo G. A.

doi:10.1038/s41598-022-15865-5

Cited by 22 publications

(11 citation statements)

References 56 publications

(34 reference statements)

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“…Gaussian state family is an important class of quantum states, which can be significantly manipulated and controlled through the existing quantum technologies [1,2]. In most of quantum information experiments based on Gaussian states, information is encoded in the associated position or momentum quadratures [1][2][3][4][5][6][7]. This is mainly due to the fact that Gaussian states are easily prepared and also can be generated deterministically for important application in diverse fields such as quantum entanglement [8,9], quantum key distribution [10,11], quantum computation [12,13], quantum teleportation [14] and verification of the error-disturbance uncertainty relation [15].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive perspective for single-mode Gaussian coherence

Singh,

ur Rahman,

Mazaheri

et al. 2024

Phys. Scr.

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In this work, we theoretically investigate single-mode Gaussian quantum coherence from a comprehensive perspective. Based on analytical expressions of the first and second moments of single-mode Gaussian states undergoing various Gaussian noisy channels, we use quantum mater equation and the method of the relative entropy to quantify the quantum coherence of any single-mode Gaussian state. We demonstrate that the displaced thermal state achieves maximum quantum coherence when using only the displaced vacuum state, which is a pure coherent state. However, for various lossy noise channels, quantum coherence shows a significant decrease. In the context of a squeezed thermal state, when controlling the squeezing parameter for a given environmental temperature, quantum coherence has been witnessed to increase. The ultimate upper bound of quantum coherence is then attained with the squeezed vacuum state. In particular, we determined the most generalized scenario of the displaced squeezed thermal state. The maximum value of quantum coherence is obtained when displacement and squeeze parameters both attain maximum value. Our study might be important in the future for the characterisation as well as the estimation of various nonclassical quantum correlations in single-mode Gaussian states.

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Section: Introductionmentioning

confidence: 99%

A comprehensive perspective for single-mode Gaussian coherence

Singh,

ur Rahman,

Mazaheri

et al. 2024

Phys. Scr.

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“…In addition, non-Markovianity has been used to enhance CVQKD system security [8,9]. Noisy propagation of Gaussian states has been demonstrated in optical media with finite bandwidth [10], which can potentially be used for performance improvement. However, there is little work on enhancement of practical security related to secret key generation at the receiver of a system.…”

Section: Introductionmentioning

confidence: 99%

Adjusting Optical Polarization with Machine Learning for Enhancing Practical Security of Continuous-Variable Quantum Key Distribution

Zhou,

Guo

2024

Electronics

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An available trick to mitigate the interference of environmental noise in quantum communications is to modulate signals with time-polarization multiplexing. Conversely, due to effects of the atmospheric turbulence in free space, the polarization of signals fluctuates randomly, resulting in feasible information leakage when direct polarization demultiplexing is carried out at the receiver, drowning out the noise-contained signals. For enhancing the practical security of the continuous-variable quantum key distribution (CVQKD), we propose a machine learning (ML) approach for optimization of the dynamic polarization control (DPC) of signals transmitted through atmospheric turbulence. An optimal DPC scheme can be adaptively adjusted with ML algorithms, which is based on the received signals at the receiver for solving the loophole problem of information leakage since it provides an accurate response to the polarization changes regarding the anamorphic signals. The performance of the CVQKD system can be increased in terms of secret key rates and maximal transmission distance as well. Numerical simulation shows the positive effect of the ML-based DPC while taking into account the secret key rate of the CVQKD system. The ML-based DPC effectively reduces the feasibility of information leakage and hence results in an increased secret key rate of the practical CVQKD system.

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“…Ideas of open quantum systems have wide applicability. [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] In many cases, the dynamics of an OQS can be described using a Markovian approximation where a clean separation between the system and environment time scales exist. When this is not so, we enter the non-Markovian regime.…”

Section: Introductionmentioning

confidence: 99%

Harnessing Quantumness of States using Discrete Wigner Functions under (non)‐Markovian Quantum Channels

2023

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The negativity of the discrete Wigner functions (DWFs) is a measure of non‐classicality and is often used to quantify the degree of quantum coherence in a system. The study of Wigner negativity and its evolution under different quantum channels can provide insight into the stability and robustness of quantum states under their interaction with the environment, which is essential for developing practical quantum computing systems. The variation of DWF negativity of qubit, qutrit, and two‐qubit systems under the action of (non)‐Markovian random telegraph noise (RTN) and amplitude damping (AD) quantum channels is investigated. Different negative quantum states that can be used as a resource for quantum computation and quantum teleportation are constructed. The success of quantum computation and teleportation is estimated for these states under (non)‐Markovian evolutions.

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Noisy propagation of Gaussian states in optical media with finite bandwidth

Cited by 22 publications

References 56 publications

A comprehensive perspective for single-mode Gaussian coherence

A comprehensive perspective for single-mode Gaussian coherence

Adjusting Optical Polarization with Machine Learning for Enhancing Practical Security of Continuous-Variable Quantum Key Distribution

Harnessing Quantumness of States using Discrete Wigner Functions under (non)‐Markovian Quantum Channels

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