Scattering of non-separable states of light

Perumangatt, Chithrabhanu; Salla, Gangi Reddy; Anwar, Ali; Aadhi, A.; Prabhakar, Shashi; Singh, R. P.

doi:10.1016/j.optcom.2015.06.066

Cited by 16 publications

(12 citation statements)

References 29 publications

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“…From this analysis we determine the state to be 3 = 1/√2(| ⟩ − | ⟩) and fidelity is 0.992. For hybrid-entanglement, we prepared the classical pump beam in nonseparable state [28] in OAM and polarization DoF by placing SPP inside the polarization Sagnac interferometer with phase variation corresponding to OAM mode of l=1, 2 and 3. The non-separable state of the pump beam incident to the nonlinear crystal can be expressed, 2 = 1/√2(| ⟩ + − | − ⟩) with intensity distribution shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, light beams with non-separable states in polarization and OAM [27,28] have attracted a great deal of interest due to its violation of Bell like inequality [29,30]. Here we propose, for the first time to the best of our knowledge, direct transfer of non-separable laser beams into hybrid entangle two photon state in a simple experimental scheme.…”

Section: Introductionmentioning

confidence: 99%

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Transfer of classical non-separable state to hybrid entangled two photon state in parametric down conversion process

Jabir

Chaitanya

Samanta

2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Hybrid entangled states, having entanglement between different degrees-of-freedom (DoF) of a particle pair, are of great interest for quantum information science and communication protocols. Among different DoFs, the hybrid entangled states encoded with polarization and orbital angular momentum (OAM) allow the generation of qubitqudit entangled states, macroscopic entanglement with very high quanta of OAM and improvement in angular resolution in remote sensing. Till date, such hybrid entangled states are generated by using a high-fidelity polarization entangled state and subsequent imprinting of chosen amount of OAM using suitable mode converters such as spatial light modulator in complicated experimental schemes. Given that the entangled sources have feeble number of photons, loss of photons during imprinting of OAM using diffractive optical elements limits the use of such hybrid state for practical applications. Here we report, on a simple experimental scheme to generate hybrid entangled state in polarization and OAM through direct transfer of classical non-separable state of the pump beam in parametric down conversion process. As a proof of principle, using local non-separable pump state of OAM mode l=3, we have produced quantum hybrid entangled state with entanglement witness parameter of ̂= 1.25±0.03 violating by 8 standard deviation. The generic scheme can be used to produce hybrid entangled state between two photons differing by any quantum number through proper choice of non-separable state of the pump beam.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transfer of classical non-separable state to hybrid entangled two photon state in parametric down conversion process

Jabir

Chaitanya

Samanta

2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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“…The polarization matrix equals the density matrix of the photons source [14], [15], since the density matrix is the unit trace scaling of the polarization matrix and T r(ρ pol ) = 1, such as for the rest of the present paper we will refer to ρ pol as the density matrix of polarization of X-ray photons.…”

Section: X-ray Polarization From Accreting Black Holesmentioning

confidence: 99%

Creation of single-photon entangled states around rotating black holes

Racorean¹

2018

New Astronomy

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Recently, numerical simulations showed that X-ray photons emitted by accretion disks acquire rotation of polarization angle and orbital angular momentum due to strong gravitational field in the vicinity of the rotating black holes. Based on these two degrees of freedom we construct a bipartite two-level quantum system of the accretion disk's photons. To characterize the quantum states of this composite system we consider linear entropy for the reduced density matrix of polarization with the intention to exploit its direct relation with the photons degree of polarization. Accordingly, the minimum degree of polarization of X-ray radiation located in the transition region of the accretion disk indicates a high value of the linear entropy for the photons emitted on this region, inferring a high degree of entanglement in the composite system. We emphasize that for an extreme rotating black hole in the thermal state, the photons with energies at the thermal peak are maximally entangled in polarization and orbital angular momentum, leading to the creation of all four Bell states. Detection and measurement of quantum information encoded in photons emitted in the accretion disk around rotating black holes may be performed by actual quantum information technology.Comment: 7 pages, 2 figure

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“…Apart from the basic interest of demonstrating quantum protocols using classical light beams, they find applications in various fields [14,15,16,17]. These non-separable states are shown to be robust under scattering and used to show the phase recovery of a beam after scattering [18,19].…”

Section: Introductionmentioning

confidence: 99%

Pancharatnam phase in non-separable states of light

et al. 2016

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Abstract. We generate the non-separable state of polarization and orbital angular momentum (OAM) using a laser beam. The generated state undergoes a cyclic polarization evolution which introduces a Pancharatnam geometric phase to the polarization state and in turn a relative phase in the non-separable state. We experimentally study the violation of Bell -CHSH inequality for different Pancharatnam phases introduced by various cyclic polarization evolutions with linear and circular states as measurement bases. While measuring in linear bases, the Bell-CHSH parameter oscillates with Pancharatnam phase. One can overcome this dependence by introducing a relative phase in one of the projecting state. However for measurement in circular bases, the Pancharatnam phase does not affect the Bell-CHSH violation.

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Scattering of non-separable states of light

Cited by 16 publications

References 29 publications

Transfer of classical non-separable state to hybrid entangled two photon state in parametric down conversion process

Transfer of classical non-separable state to hybrid entangled two photon state in parametric down conversion process

Creation of single-photon entangled states around rotating black holes

Pancharatnam phase in non-separable states of light

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