Pairwise Measurement Induced Synthesis of Quantum Coherence

• URL: http://arxiv.org/abs/2211.08860v1
• Date: Wed, 16 Nov 2022 12:10:26 GMT
• Title: Pairwise Measurement Induced Synthesis of Quantum Coherence
• Authors: Mariia Gumberidze, Michal Kol\'a\v{r}, and Radim Filip
• Abstract summary: We propose a measurement-based protocol for quantum coherence synthesis from individual systems. As an input, it uses $N$ non-interacting copies of two-level systems with low initial energy and coherence. This protocol conditionally synthesizes an output state with higher energy and coherence than the initial state had.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Quantum coherent superpositions of states with different energies, i.e., states with coherence with respect to energy basis, are important resource for modern quantum technologies. States with small coherence can be obtained either autonomously, due to the effect of a weak coherent drive or, potentially, due to the presence of an environment. In this paper, we propose a measurement-based protocol for quantum coherence synthesis from individual systems (with low initial coherence) into a global (and higher) coherence of the joint system. As an input, it uses $N$ non-interacting copies of two-level systems (TLS), with low initial energy and coherence. These can be supplied by, e.g., a weak external drive or can result from an interaction with a bath. This protocol conditionally synthesizes an output state with higher energy and coherence than the initial state had, representing an universal process whose rules have not been well studied, yet. In addition to energy and coherence, we study the quantity called mutual coherence, showing increase after the protocol application, as well. This approach is based on application of sequential pairwise projective measurements on TLS pairs (conditionally removing their ground states), that are diagonal in the TLS energy basis. The functionality of the coherence synthesis is robust with respect to dephasing effects of the TLS environment on the system. Our approach may show its benefits in quantum sensing, quantum batteries charging, or other applications where synthesis of a larger coherent system from smaller (weaker) resources is useful.

Related papers

• Demonstration of energy extraction gain from non-classical correlations [62.615368802619116]
  We show that entanglement governs the amount of extractable energy in a controllable setting. By quantifying both the concurrence of the two-qubit resource state and the energy extraction gain from applying the feedback policy, we corroborate the connection between information and energy.
  arXiv  Detail & Related papers  (2024-04-23T08:44:07Z)
• Local Purity Distillation in Quantum Systems: Exploring the Complementarity Between Purity and Entanglement [41.94295877935867]
  We introduce and develop the framework of Gibbs-preserving local operations and classical communication. We focus on systems with fully degenerate local Hamiltonians, where local cooling aligns with the extraction of local purity. Our findings open doors to various practical applications, including techniques for entanglement detection and estimation.
  arXiv  Detail & Related papers  (2023-11-20T14:58:31Z)
• Measurement Induced Synthesis of Coherent Quantum Batteries [0.0]
  We propose a conditional synthesis of $N$ independent two-level systems (TLS) with partial quantum coherence obtained from an environment to one coherent system. The measurement process acts here as a Maxwell demon synthesizing the coherent energy of individual TLS to one large coherent quantum battery.
  arXiv  Detail & Related papers  (2022-11-16T12:33:34Z)
• Local coherence by thermalized intra-system coupling [0.0]
  Quantum superposition of energy eigenstates can appear autonomously in a single quantum two-level system coupled to a low-temperature thermal bath. We propose a different and more feasible approach employing engineered interactions between two-level systems being thermalized into a global Gibbs state.
  arXiv  Detail & Related papers  (2022-11-16T11:52:33Z)
• From Goldilocks to Twin Peaks: multiple optimal regimes for quantum transport in disordered networks [68.8204255655161]
  Open quantum systems theory has been successfully applied to predict the existence of environmental noise-assisted quantum transport. This paper shows that a consistent subset of physically modelled transport networks can have at least two ENAQT peaks in their steady state transport efficiency.
  arXiv  Detail & Related papers  (2022-10-21T10:57:16Z)
• Probing infinite many-body quantum systems with finite-size quantum simulators [0.0]
  We propose a protocol that makes optimal use of a given finite-size simulator by directly preparing, on its bulk region, a mixed state. For systems of free fermions in one and two spatial dimensions, we illustrate and explain the underlying physics. For the example of a non-integrable extended Su-Schrieffer-Heeger model, we demonstrate that our protocol enables a more accurate study of QPTs.
  arXiv  Detail & Related papers  (2021-08-27T16:27:46Z)
• Creating and destroying coherence with quantum channels [62.997667081978825]
  We study optimal ways to create a large amount of quantum coherence via quantum channels. correlations in multipartite systems do not enhance the ability of a quantum channel to create coherence. We show that a channel can destroy more coherence when acting on a subsystem of a bipartite state.
  arXiv  Detail & Related papers  (2021-05-25T16:44:13Z)
• Enhancement of quantum correlations and geometric phase for a driven bipartite quantum system in a structured environment [77.34726150561087]
  We study the role of driving in an initial maximally entangled state evolving under a structured environment. This knowledge can aid the search for physical setups that best retain quantum properties under dissipative dynamics.
  arXiv  Detail & Related papers  (2021-03-18T21:11:37Z)
• Experimental study of quantum coherence decomposition and trade-off relations in a tripartite system [8.797280564220879]
  We study the full set of coherence trade-off relations between the original state, the bipartite product state, the tripartite product state, and the decohered product state. We find that despite the different types of states involved, the properties of the state in terms of coherence and monogamy are equivalent.
  arXiv  Detail & Related papers  (2020-11-16T15:44:58Z)
• QuTiP-BoFiN: A bosonic and fermionic numerical hierarchical-equations-of-motion library with applications in light-harvesting, quantum control, and single-molecule electronics [51.15339237964982]
  "hierarchical equations of motion" (HEOM) is a powerful exact numerical approach to solve the dynamics. It has been extended and applied to problems in solid-state physics, optics, single-molecule electronics, and biological physics. We present a numerical library in Python, integrated with the powerful QuTiP platform, which implements the HEOM for both bosonic and fermionic environments.
  arXiv  Detail & Related papers  (2020-10-21T07:54:56Z)
• Quantum versus classical transport of energy in coupled two-level systems [0.0]
  We study the cases for which either coherent or incoherent energy hopping takes place in the chain. Our results strongly suggest the significant role played by quantum invasiveness as a resource for quantum transport.
  arXiv  Detail & Related papers  (2020-07-30T18:01:06Z)

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.