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

The European Physical Journal D

Coherent-state qubits: entanglement and decoherence

János K. Asbóth, Петер Адам, Mátyás Koniorczyk, József Janszky

Published Aug 9, 2004• 20 citations
Publisher
DOI
10.1140/epjd/e2004-00094-2

Related papers

Decoherence of steerability and coherence dynamics induced by nonlinear qubit–cavity interactions

Abdel‐Baset A. Mohamed, Abdullah M. Alsahli

Abstract In this study, we have applied the intrinsic decoherence (ID) model of the Milburn equation to investigate the temporal evolution of various quantum resources (steerability, entanglement, and coherence) in the generated dipole-coupled two-qubit states. Einstein–Podolsky–Rosen steering, EOF, and Jensen–Shannon divergence are used to analyze these quantum resources. We consider two dipole-coupled qubit interacting with two spatially separated cavities with nonlinear photonic transitions, filled with a superposition of generalized Barut–Girardello coherent fields. The exploration of steerability, entanglement, and coherence has been carried out by considering the nonlinearity of qubit–cavity interactions, the nonclassicality of the superposition of Barut–Girardello coherent fields, the dipole–dipole coupling, and the ID of qubit–cavity interactions. Our results show that the nonlinearity of qubit–cavity interactions, the initial generalized Barut–Girardello coherent states, and the qubit–cavity detuning significantly enhance the generation of quantum steerability, entanglement, and coherence. The dynamics of entanglement and steerability are consistent with the hierarchy principle. The ID effect reduces the amplitudes and frequencies of the generated quantum resources to their stationary values. It is found that the phenomena of sudden steerability arising and sudden annihilation of entanglement are influenced by the initial non-classicality, dipole coupling, and intrinsic qubit–cavity decoherence. Moreover, the strong decoherence and dipole coupling significantly enhance the steady-state values of steerability, entanglement, and coherence.

Open Physics•Jan 1, 2025•0 citations

Entangled coherent states and their decoherence properties

Osamu Hirota, Genta Masada

•Jan 1, 2006•0 citations

Decoherence and entanglement of a pair of coupled qubits

Mohammad Mehdi Sahrapour, Nancy Makri

Bulletin of the American Physical Society•Mar 23, 2011•0 citations

Teleportation of Coherent-State Qubits with Asymmetric and Lossy Entanglement Distribution

Davide Andromari, Andrea Giani, Moe Z. Win +1 more

Quantum teleportation enables transferring quantum states by leveraging entanglement. The distribution of entangled states is challenged by decoherence, which degrades the teleportation performance. Continuous-variable teleportation with coherent-state qubits has gained particular interest because it can provide better performance than discrete-variable teleportation with polarization-encoded qubits and is more resilient to decoherence. However, most existing schemes employ a specific configuration of coherent-state qubits, namely Schrödinger cat states, and assume symmetric photon-loss channels. This work explores the teleportation of qubits based on coherent states through asymmetric quantum channels impaired by photon loss. First, we characterize the teleportation protocol for arbitrary coherent-state qubit configurations considering asymmetric and photon-loss channels. Then, we present case studies under both ideal entanglement distribution and lossy conditions. Results reveal a trade-off between state distinguishability and teleportation fidelity, providing insight into the optimal design of coherent-state qubits in practical teleportation protocols.

International Conference on Quantum Communications, Networking, and Computing (QCNC)•Apr 6, 2026•0 citations

Quantum coherence induced by a flux qubit coupled by a resonator coherent field through a two-photon interaction

A-B A Mohamed, H. A. Hessian, Fuad S. Alduais +1 more

Abstract The intrinsic decoherence effects on a flux qubit coupled to a resonator through a two-photon interaction where the resonator field is initially in coherent and even coherent states are investigated. The qubit-resonator entanglement and coherence loss (mixedness) of the system and its subsystems are examined using entropy and negativity. The ability of the qubit-resonator interaction to generate quantum coherence (qubit-resonator entanglement and mixedness) is shown to be dependent on the initial cavity non-classicality, detuning, and decoherence. For larger values of the qubit-resonator detuning, the initial resonator non-classicality can enhance the generation and stability of quantum coherence. The decoherence degrades the qubit-resonator entanglement and destroys the sudden death-birth entanglement.

Physica Scripta•Dec 1, 2021•5 citations

Coherent states and global entanglement in an N qubit system

Piroska Dömötör, M. G. Benedict

arXiv:0709.3728•Physics Letters A•Mar 14, 2008•12 citations
Abstract In this study, we have applied the intrinsic decoherence (ID) model of the Milburn equation to investigate the temporal evolution of various quantum resources (steerability, entanglement, and coherence) in the generated dipole-coupled two-qubit states. Einstein–Podolsky–Rosen steering, EOF, and Jensen–Shannon divergence are used to analyze these quantum resources. We consider two dipole-coupled qubit interacting with two spatially separated cavities with nonlinear photonic transitions, filled with a superposition of generalized Barut–Girardello coherent fields. The exploration of steerability, entanglement, and coherence has been carried out by considering the nonlinearity of qubit–cavity interactions, the nonclassicality of the superposition of Barut–Girardello coherent fields, the dipole–dipole coupling, and the ID of qubit–cavity interactions. Our results show that the nonlinearity of qubit–cavity interactions, the initial generalized Barut–Girardello coherent states, and the qubit–cavity detuning significantly enhance the generation of quantum steerability, entanglement, and coherence. The dynamics of entanglement and steerability are consistent with the hierarchy principle. The ID effect reduces the amplitudes and frequencies of the generated quantum resources to their stationary values. It is found that the phenomena of sudden steerability arising and sudden annihilation of entanglement are influenced by the initial non-classicality, dipole coupling, and intrinsic qubit–cavity decoherence. Moreover, the strong decoherence and dipole coupling significantly enhance the steady-state values of steerability, entanglement, and coherence.
Quantum teleportation enables transferring quantum states by leveraging entanglement. The distribution of entangled states is challenged by decoherence, which degrades the teleportation performance. Continuous-variable teleportation with coherent-state qubits has gained particular interest because it can provide better performance than discrete-variable teleportation with polarization-encoded qubits and is more resilient to decoherence. However, most existing schemes employ a specific configuration of coherent-state qubits, namely Schrödinger cat states, and assume symmetric photon-loss channels. This work explores the teleportation of qubits based on coherent states through asymmetric quantum channels impaired by photon loss. First, we characterize the teleportation protocol for arbitrary coherent-state qubit configurations considering asymmetric and photon-loss channels. Then, we present case studies under both ideal entanglement distribution and lossy conditions. Results reveal a trade-off between state distinguishability and teleportation fidelity, providing insight into the optimal design of coherent-state qubits in practical teleportation protocols.
Abstract The intrinsic decoherence effects on a flux qubit coupled to a resonator through a two-photon interaction where the resonator field is initially in coherent and even coherent states are investigated. The qubit-resonator entanglement and coherence loss (mixedness) of the system and its subsystems are examined using entropy and negativity. The ability of the qubit-resonator interaction to generate quantum coherence (qubit-resonator entanglement and mixedness) is shown to be dependent on the initial cavity non-classicality, detuning, and decoherence. For larger values of the qubit-resonator detuning, the initial resonator non-classicality can enhance the generation and stability of quantum coherence. The decoherence degrades the qubit-resonator entanglement and destroys the sudden death-birth entanglement.