Effects of classical fluctuating environments on decoherence and bipartite quantum correlations dynamics

• URL: http://arxiv.org/abs/2107.11241v1
• Date: Fri, 23 Jul 2021 13:57:01 GMT
• Title: Effects of classical fluctuating environments on decoherence and bipartite quantum correlations dynamics
• Authors: Atta Ur Rahman, Muhammad Javed, Muhammad Noman, Arif Ullah (Quantum Optics and Quantum Information Research Group, Department of Physics, University of Malakand), Chakdara Dir (Pakistan), Ming-Xing Luo (The school of information science and technology, Southwest Jiaotong University, Chengdu 610031, China)
• Abstract summary: We show the time evolution of entanglement, purity, and coherence for a model of two non-interacting qubits initially prepared as a maximally entangled bipartite state. We show that there is a direct connection between the fluctuations allowed by an environment and the $QCs$ preservation.
• Score: 0.36299953275506025
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We address the time evolution of the quantum correlations ($QCs$) such as entanglement, purity, and coherence for a model of two non-interacting qubits initially prepared as a maximally entangled bipartite state. We contrast the comparative potential of the classical fields to preserve these $QCs$ in the noisy and noiseless realms. We also disclose the characteristic dynamical behavior of the $QCs$ of the two-qubit state under the static noisy effects originating from the common and different configuration models. We show that there is a direct connection between the fluctuations allowed by an environment and the $QCs$ preservation. Due to the static noisy dephasing effects, the $QCs$ are suppressed, resulting in the separability of the two-qubit entangled state after a finite duration. Here, the $QCs$ decay effects are found much smaller in the common configuration model than that of the opponent. Furthermore, this protection of the $QCs$ under static noise for large intervals is entirely attributable to the existence of the entanglement sudden death and birth phenomenon. Most importantly, we found the bipartite $QCs$ less fragile than the tripartite ones in comparison under the static noise. In the case of the measures, the concurrence is found to be sharper for showing the entanglement sudden death and birth revivals in comparison to the purity and decoherence.

Related papers

• Entanglement Structure and Information Protection in Noisy Hybrid Quantum Circuits [3.326868738829707]
  This Letter contributes to a deeper understanding of the interplay between quantum noises and measurement-induced phase transition. It also provides a new perspective to understand the effects of Markovian and non-Markovian noises on quantum computation.
  arXiv  Detail & Related papers  (2024-01-03T07:54:51Z)
• Spatially correlated classical and quantum noise in driven qubits: The good, the bad, and the ugly [0.0]
  Correlated noise across multiple qubits poses a significant challenge for achieving scalable quantum processors. We study the dynamics of driven qubits under spatially correlated noise, including both Markovian and non-Markovian noise. In particular, we reveal that, in the quantum limit, pure dephasing noise induces a coherent long-range two-qubit Ising interaction that correlates distant qubits.
  arXiv  Detail & Related papers  (2023-08-06T08:34:49Z)
• Observing super-quantum correlations across the exceptional point in a single, two-level trapped ion [48.7576911714538]
  In two-level quantum systems - qubits - unitary dynamics theoretically limit these quantum correlations to $2qrt2$ or 1.5 respectively. Here, using a dissipative, trapped $40$Ca$+$ ion governed by a two-level, non-Hermitian Hamiltonian, we observe correlation values up to 1.703(4) for the Leggett-Garg parameter $K_3$. These excesses occur across the exceptional point of the parity-time symmetric Hamiltonian responsible for the qubit's non-unitary, coherent dynamics.
  arXiv  Detail & Related papers  (2023-04-24T19:44:41Z)
• Autonomous coherence protection of a two-level system in a fluctuating environment [68.8204255655161]
  We re-examine a scheme originally intended to remove the effects of static Doppler broadening from an ensemble of non-interacting two-level systems (qubits) We demonstrate that this scheme is far more powerful and can also protect a single (or even an ensemble) qubit's energy levels from noise which depends on both time and space.
  arXiv  Detail & Related papers  (2023-02-08T01:44:30Z)
• Quantum Lyapunov exponent in dissipative systems [68.8204255655161]
  The out-of-time order correlator (OTOC) has been widely studied in closed quantum systems. We study the interplay between these two processes. The OTOC decay rate is closely related to the classical Lyapunov.
  arXiv  Detail & Related papers  (2022-11-11T17:06:45Z)
• Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems [52.77024349608834]
  Superconducting circuits are a leading platform for quantum computing. Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss. We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
  arXiv  Detail & Related papers  (2022-06-21T18:37:38Z)
• Quantum correlations of a two-qubit system and the Aubry-Andr\'{e} chain in bosonic environments [8.290066187716354]
  The quantum correlations of a two-qubit system are first studied in bosonic reservoirs. Non-Markovian effects can improve the survival time of the quantum correlations significantly. Non-Markovian dynamics with existing memory can lead to entanglement rebirth in specific scenarios.
  arXiv  Detail & Related papers  (2022-03-20T05:38:44Z)
• Demonstration of entanglement and coherence in GHZ-like state when exposed to classical environments with power-law noise [0.9392167468538464]
  Entanglement and coherence protection are investigated using the dynamical map of three non-interacting qubits. We assume power-law (PL) noise, which controls external fields in three different configurations with single or multiple noise sources. Unlike the bipartite states and tripartite W-type states, the GHZ-like state has been shown to have positive traits of preserving entanglement and coherence against PL noise.
  arXiv  Detail & Related papers  (2021-11-02T17:15:13Z)
• Probing tripartite entanglement and coherence dynamics in pure and mixed independent classical environments [0.40631409309544836]
  We address the dynamics of entanglement and coherence for three non-interacting qubits initially prepared as maximally entangled GHZ-like state. We show that the current mixed noise cases are more detrimental than pure ones where entanglement and coherence are found short-lived.
  arXiv  Detail & Related papers  (2021-07-23T14:18:40Z)
• Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
  Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
  arXiv  Detail & Related papers  (2021-07-23T07:30:57Z)
• Boundary time crystals in collective $d$-level systems [64.76138964691705]
  Boundary time crystals are non-equilibrium phases of matter occurring in quantum systems in contact to an environment. We study BTC's in collective $d$-level systems, focusing in the cases with $d=2$, $3$ and $4$.
  arXiv  Detail & Related papers  (2021-02-05T19:00:45Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.