Spin-orbit 
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 states

Balthazar, W. F.; Braga, D. G.; Lamego, V. S.; Passos, M. H. M.; Huguenin, J. A. O.

doi:10.1103/physreva.103.022411

Cited by 11 publications

(5 citation statements)

References 45 publications

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“…Recently, it was proposed the study of mixed states by exploring spin-orbit modes. An optical circuit to prepare a general spin-orbit X-states was simulated [31] and discord calculations for several classes of modes show to be in agreement with the quantum theory predictions. This result opens new perspectives of exploration of spin-orbit modes in scenarios where entanglement is not present, but another quantum correlation, the quantum discord.…”

Section: Introductionmentioning

confidence: 53%

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Partial nonseparability of spin-orbit modes

Lamego¹,

Braga²,

Oliveira³

et al. 2023

J. Opt.

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Structured light plays an essential role in several quantum information protocols by using the degrees of freedom of light to encode qubits. For exploring different correlations, especially in mixed states, such as discord, it is necessary to prepare partially entangled states. In this work, we present a theoretical and experimental study of a partial nonseprable spin-orbit modes. By exploring classical-quantum analogy, we perform the measurement of the Concurrence of partially separable modes directly from projective measurment of polarization. The results show a clear agreement with predictions of quantum theory for partially entangled states. We also perform a study of CHSH inequality and show that partial violation is observed in entire agreement with the expected by Quantum Theory. For the maximally nonseparable mode, we achieve a violation of $S=2.73 \pm 0.03 $, one of the higher ones observed for spin-orbit modes based on our best knowledge.

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Section: Introductionmentioning

confidence: 53%

“…Equations ( 21) and (31) present C(θ) and S(θ), respectively. Both depend on our unique preparation parameter θ.…”

Section: Partial Violation Of Chsh Inequalitymentioning

confidence: 99%

Partial nonseparability of spin-orbit modes

Lamego¹,

Braga²,

Oliveira³

et al. 2023

J. Opt.

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“…Lets discuss the measurement. At the end of each path, we have a spin-orbit state tomography circuit, as presented in [28]. With the tomography circuit, we will reconstruct the reduced density matrix ρ AB .…”

Section: A Ghz Statementioning

confidence: 99%

“…Experimental setup for W-like state preparation. NLC: non linear crystal, SWP: S-wave plate to produce spin-orbit nonseparablel modes, PBS: Polarized Beam Splitter, HWP φ : half wave plate with its fast axis with an angle φ = α, β, 45 • with the horizontal, DP 45 • : Dove prism with its base rotated of 45 • with respect the horizontal, TOMO: tomography circuit for spin-orbit states as proposed in Ref [28]…”

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confidence: 99%

Tripartite State Characterization via Activated Bipartite Entanglement

Arruda¹,

Balthazar²,

Moreira³

et al. 2021

Preprint

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We propose a way to identify and classify genuine tripartite entanglement in pure states of three-qubit systems via the Activated Bipartite Entanglement (ABE). We show that for pure states pertaining to one of the two inequivalent classes of genuine tripatite entanglement, for which the GHZ and the W states are the notorious representatives, the ABE is always greater than zero, while for separable tripartite pure states or bipartite entanglement between two parts of three-qubit pure states it is always null. In addition we present a experimental proposal by using liner optical circuits and degrees of freedom of a single photon to verify the characterization via distributed entanglement. The circuit simulation showed an excellent accordance with theoretical prediction for a wide classes of GHZ states.

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“…Due to the presence of the elements in the main and other diagonal only, the two-qubit X states have been shown to be produced in a vast variety of experimentally realizable systems such as optical systems [27][28][29][30], ultra cold atoms [31,32], and nuclear magnetic resonance [33]. More recently, a method for generation of spin-orbit X states via the use of an optical setup is also proposed [34].…”

Section: Introductionmentioning

confidence: 99%

Attainable and usable coherence in X states over Markovian and non-Markovian channels

Mishra,

Thapliyal,

Pathak

2021

Preprint

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The relations between the resource theoretic measures of quantum coherence are rigorously investigated for various Markovian and non-Markovian channels for the two-qubit X states with specific attention to the maximum and minimum attainable coherence and usefulness of these states in performing quantum teleportation in noisy environment. The investigation has revealed that under both dephasing and dissipative type noises the maximally entangled mixed states and Werner states lose their form and usefulness. However, maximally non-local mixed states (MNMSs) lose their identity in dissipative noise only. Thus, MNMSs are established to be useful in teleporting a qubit with fidelity greater than the classical limit in the presence of dephasing noise. MNMSs also remain useful for device independent quantum key distribution in this case as they still violate Bell's inequality. In the presence of noise, coherence measured by relative entropy of coherence is found to fall faster than the same measured using l1 norm of coherence. Further, information back-flow from the environment to the system is observed over non-Markovian channels which leads to revival in coherence. Additionally, sequential interaction of two qubits with the same environment is found to result in correlated noise on both qubits, and coherence is observed to be frozen in this case under dephasing channel. Under the effect of Markovian and non-Markovian dephasing channels studied here, we observed that MNMSs have maximum relative coherence, i.e., they have the maximum amount of l1 norm of coherence among the states with the same amount of relative entropy of coherence. However, this feature is not visible in any X state evolving over dissipative channels.

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Spin-orbit X states

Cited by 11 publications

References 45 publications

Partial nonseparability of spin-orbit modes

Partial nonseparability of spin-orbit modes

Tripartite State Characterization via Activated Bipartite Entanglement

Attainable and usable coherence in X states over Markovian and non-Markovian channels

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