Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physics Letters A

Dynamical process of quantum dense coding in an exactly solvable model at finite temperature

Sachiko Kitajima

Published Dec 10, 2004• 3 citations
Publisher
DOI
10.1016/j.physleta.2004.11.039

Related papers

Exactly solvable 3D quantum model with finite temperature topological order

Isaac H. Kim

Bulletin of the American Physical Society•Mar 25, 2011•1 citation

Dynamics of Quantum Fluctuations in a Communication Channel –Quantum Dense Coding–

Sachiko Kitajima

The dynamics of a quantum dense coding process is formulated and exactly solved on the basis of a boson detector model previously used to study decoherence processes. When classical information encoded in entangled states is transmitted through a quantum mechanical communication channel, an environment exerts quantum noise causing decoherence and disentanglement. Shannon's mutual information and error probability function are obtained explicitly as functions of time.

Journal of the Physical Society of Japan•May 15, 2004•5 citations

Quantum Dynamics at Finite Temperature

WORLD SCIENTIFIC eBooks•Jul 1, 1998•0 citations

Improving the capacity of quantum dense coding from decoherence of finite temperature using parity-time symmetric operations

Fei Chen, Yang Leng

Abstract This paper explores enhancing quantum dense coding capacity in finite-temperature decoherence environments via parity-time ( PT ) symmetric operations. We derive the master equation for a two-qubit system in a thermal bath, analyzing dense coding dynamics with and without PT symmetry operations. Without PT operations, the quantum dense coding capacity is highly sensitive to temperature parameter and decoherence rate, losing its advantage at high temperatures. Introducing a local PT symmetric operation on one qubit restores and surpasses the noiseless capacity. Additionally, numerical analysis demonstrates that by adjusting the non-Hermiticity, the optimal protection rate can always exceed 1. Our findings demonstrate PT symmetric operations as a novel tool to protect quantum correlations and enhance information transmission in realistic thermal settings, offering insights for robust quantum communication protocols.

Laser Physics•Jul 1, 2025•1 citation

A new perturbative approach to the study of quantum systems at finite temperature

A. Riccardi

Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento B•May 1, 1990•0 citations

Thermodynamic Cost of Quantum transfers

Фороузан Мирмасоуди, Sodeif Ahadpour

Abstract In this work, we will study thermodynamic cost of dense coding. In this regard, a scheme is proposed for quantum channel where is induced from two initially uncorrelated thermal quantum systems. At first, the quantum Fisher information and spin squeezing is used to quantify the correlation dynamics over the system. The system reveals that the dynamics of quantum correlations depends crucially on specific energy and temperature. Also, they can be utilized as control parameters for optimal dense coding. Several interesting features of the variations of the energy cost and the dense coding capacity are obtained. It can keep its own valid capacity value in a broad range of temperature by increasing in the energy value of excited states. Also, we can identify valid dense coding with the help of calculating energy cost in the system. Using this approach, identifying a critical point of this model in dense coding capacity quality can be very effective.

•Apr 30, 2021•0 citations
Abstract This paper explores enhancing quantum dense coding capacity in finite-temperature decoherence environments via parity-time ( PT ) symmetric operations. We derive the master equation for a two-qubit system in a thermal bath, analyzing dense coding dynamics with and without PT symmetry operations. Without PT operations, the quantum dense coding capacity is highly sensitive to temperature parameter and decoherence rate, losing its advantage at high temperatures. Introducing a local PT symmetric operation on one qubit restores and surpasses the noiseless capacity. Additionally, numerical analysis demonstrates that by adjusting the non-Hermiticity, the optimal protection rate can always exceed 1. Our findings demonstrate PT symmetric operations as a novel tool to protect quantum correlations and enhance information transmission in realistic thermal settings, offering insights for robust quantum communication protocols.
Abstract In this work, we will study thermodynamic cost of dense coding. In this regard, a scheme is proposed for quantum channel where is induced from two initially uncorrelated thermal quantum systems. At first, the quantum Fisher information and spin squeezing is used to quantify the correlation dynamics over the system. The system reveals that the dynamics of quantum correlations depends crucially on specific energy and temperature. Also, they can be utilized as control parameters for optimal dense coding. Several interesting features of the variations of the energy cost and the dense coding capacity are obtained. It can keep its own valid capacity value in a broad range of temperature by increasing in the energy value of excited states. Also, we can identify valid dense coding with the help of calculating energy cost in the system. Using this approach, identifying a critical point of this model in dense coding capacity quality can be very effective.