Orbital and electronic entanglement in quantum teleportation schemes

Galler, Anna; Thunström, Patrik

doi:10.1103/physrevresearch.3.033120

Cited by 6 publications

(11 citation statements)

References 60 publications

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“…Here, Â op denotes the operator norm of Â, i.e., the largest absolute value of its eigenvalues. Relation (10) confirms in quantitative terms that whenever a quantum state is close to the set D 0 of uncorrelated states then its correlation function is small for any choice of local observables Â, B. This highlights again the strength of quantum information theoretical concepts which is based on the universal character of their predictions.…”

Section: B Overview Of Various Correlation Typessupporting

confidence: 53%

“…Hence, by choice, our analysis neglects in the present work any electron correlation contributions arising from σ-type MOs as well as set(s) of higher-lying (correlating) secondary π * -orbitals. To corroborate this approximation, we performed additional test calculations on decapentaene considering CAS spaces of CAS (34,34) and CAS (10,20), respectively. Those large-scale test calculations revealed that correlation contributions to the valence π-π * -framework arising either from the C-C and C-H σ-framework (CAS (34,34)) or from additional correlating π * -orbitals (CAS (10,20)) are (i) differential (within the additional sets of {σ, σ * } MOs) or (ii) safely negligible with natural orbital occupation numbers of the valence π-π * -space changing by less than ±0.003.…”

Section: A General Considerationsmentioning

confidence: 99%

“…More specifically, we consider two exemplary systems with n = 8 (decapentaene, C 10 H 12 ) and n = 18 (eicosadecaene, C 20 H 22 ). To unambiguously study the individual correlation contributions within the valence π ( * ) -space requires for those molecular systems active orbital spaces of CAS (10,10) and CAS (20,20), respectively. Given the size of these CAS spaces, single-orbital and orbital-orbital correlations will no longer coincide, and need to be addressed separately.…”

Section: B Polyenementioning

confidence: 99%

“…In light of the fast-approaching second quantum revolution [1,2], soon we will be able to comprehensively exploit the quantum nature of chemical systems to our advantage. This historic opportunity has boosted many studies on fermionic correlation and entanglement in the quantum information (QI) community [3][4][5][6][7][8][9][10][11][12][13][14][15], with an emphasis on the conceptual formalism and resource utilization aspects. Independently, fermionic correlation has been used to describe the electronic structure of chemical systems [16][17][18] and to improve as well as optimize the initial ansatz of numerical methods [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quantum correlations in molecules: from quantum resourcing to chemical bonding

Ding¹,

Knecht²,

Zimborás³

et al. 2022

Preprint

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Section: B Overview Of Various Correlation Typessupporting

confidence: 53%

Section: A General Considerationsmentioning

confidence: 99%

Section: B Polyenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantum correlations in molecules: from quantum resourcing to chemical bonding

Ding¹,

Knecht²,

Zimborás³

et al. 2022

Preprint

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“…Compared with optical quantum communication, classical communication is not safe or efficient. Quantum communication is a novel approach, mainly consists of quantum teleportation and quantum key distribution [2].…”

Section: Introductionmentioning

confidence: 99%

The Progress and the state-of-art approaches of Quantum Teleportation and Communication

Dong¹

2022

HSET

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Quantum teleportation is a new technique utilized dispersed quantum entanglement to transmit information (i.e., the quantum states). In this paper, the principles and the protocol will be introduced systematically. Specifically, the experimental setups and the state-of-art applications will be discussed. According to the analysis, one can better understand the working principle and current development of quantum teleportation. However, the limitation of further applying the quantum teleportation is obvious the cost of building the QT infrastructure and the superconducting technology. Besides, it is also too expensive to achieve large-scale use and commercial promotion. In the future, QT will expand its industrial scale and build a national or even global quantum communication network. These results shed light on guiding further development for quantum teleportation important.

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Classical and quantum orbital correlations in molecular electronic states

Pusuluk

Torun

et al. 2022

New J. Phys.

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The quantum superposition principle has been extensively utilized in the quantum mechanical description of bonding phenomenon. It explains the emergence of delocalized molecular orbitals and provides a recipe for the construction of near-exact electronic wavefunctions. On the other hand, its existence in composite systems may give rise to nonclassical correlations that are regarded as a resource in quantum technologies. Here, we approach the electronic ground states of three prototypical molecules in the light of the framework set by fermionic information theory. By introducing the notion of orbital discord, we additively decompose the pairwise orbital correlations into their classical and quantum parts in the presence of superselection rules. We observe that quantum orbital correlations can be stronger than classical orbital correlations though not often. Moreover, quantum orbital correlations can survive even in the absence of orbital entanglement depending on the symmetries of the constituent orbitals. Finally, we demonstrate that orbital entanglement would be underestimated if the orbital density matrices were treated as qubit states.

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Orbital and electronic entanglement in quantum teleportation schemes

Cited by 6 publications

References 60 publications

Quantum correlations in molecules: from quantum resourcing to chemical bonding

Quantum correlations in molecules: from quantum resourcing to chemical bonding

The Progress and the state-of-art approaches of Quantum Teleportation and Communication

Classical and quantum orbital correlations in molecular electronic states

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