High-precision quantum transmittometry of DNA and methylene-blue using a frequency-entangled twin-photon beam in type-I SPDC

Motazedifard, Ali; Madani, Seyed Ahmad

doi:10.1364/osac.413830

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…This type of NLC has potential to generate the type-II polarization-entangled Bell-state (for more details about the state of SPDC, see Refs. [2] , [12] , [13] ).…”

Section: Resultsmentioning

confidence: 99%

“…[4] ). Among these, one can remark, for example, EPR realization [9] , the entanglement generation [10] , [11] , [12] , [13] , [14] , [15] , quantum state teleportation [16] , quantum ellipsometry [17] , [18] , quantum illumination [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , quantum spectroscopy [27] , [28] , [29] , [30] , squeezing generation [31] , quantum imaging [32] , [33] , [34] , [35] , [36] , quantum communication [37] , [38] , [39] , [40] , [41] , [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , and nonlocal realism tests [9] , [51] , [52] , [53] , [54] , [55] .…”

Section: Introductionmentioning

confidence: 99%

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Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Motazedifard

Madani

Dashkasan

et al. 2021

Heliyon

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We have experimentally created a robust, ultrabright and phase-stable polarization-entangled state close to maximally entangled Bell-state with %98-fidelity using the type-II spontaneous parametric down-conversion (SPDC) process in periodically-poled KTiOPO 4 (PPKTP) collinear crystal inside a Sagnac interferometer (SI). Bell inequality measurement, Freedman's test, as the different versions of CHSH inequality, and also visibility test which all can be seen as the nonlocal realism tests, imply that our created entangled state shows a strong violation from the classical physics or any hidden-variable theory. We have obtained very reliable and very strong Bell violation as = 2.78 ± 0.01 with high brightness  HV = %(99.969 ± 0.003) and  DA = %(96.751 ± 0.002) and very strong violation due to Freedman test as F = 0.01715 ± 0.00001. Furthermore, using the tomographic reconstruction of quantum states together a maximum-likelihood-technique (MLT) as the numerical optimization, we obtain the physical non-negative definite density operator which shows the nonseparability and entanglement of our prepared state. By having the maximum likelihood density operator, we calculate some important entanglement-measures and entanglement entropies. The Sagnac configuration provides bidirectional crystal pumping yields to high-rate entanglement source which is very applicable in quantum communication, sensing and metrology as well as quantum information protocols, and has potential to be used in quantum illuminationbased LIDAR and free-space quantum key distribution (QKD).

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“…This type of NLC has potential to generate the type-II polarization-entangled Bell-state (for more details about the state of SPDC, see Refs. [2] , [12] , [13] ).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Motazedifard

Madani

Dashkasan

et al. 2021

Heliyon

Self Cite

View full text Add to dashboard Cite

show abstract

“…This type of NLC has potential to generate the type-II polarization-entangled Bell-state (for more details about the state of SPDC, see Refs. [2,8,9]).…”

Section: B Quasi-phase Matching (Qpm) Conditionmentioning

confidence: 99%

“…[3]). Among these, one can remark, for example, EPR realization [5], the entanglement generation [6][7][8][9], quantum state teleportation [10], quantum ellipsometry [11,12], quantum illumination [13][14][15][16][17][18][19][20], quantum spectroscopy [21][22][23][24], squeezing generation [25], quantum imaging [26][27][28][29][30], quantum communication [31][32][33][34][35][36][37][38][39][40], and nonlocal realism tests [5,[41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Motazedifard,

Madani,

Dashkasan

et al. 2020

Preprint

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We have experimentally created a robust, ultrabright and phase-stable polarization-entangled state close to maximally entangled Bell-state with %98-fidelity using the type-II spontaneous parametric down-conversion (SPDC) process in periodically-poled KTiOPO 4 (PPKTP) collinear crystal inside a Sagnac interferometer (SI). Bell inequality measurement, Freedman's test, as the different versions of CHSH inequality, and also visibility test which all can be seen as the nonlocal realism tests, imply that our created entangled state shows a strong violation from the classical physics or any hidden-variable theory. We have obtained very reliable and very strong Bell violation as S = 2.78 ± 0.01 with high brightness V HV = %(99.969 ± 0.003) and V DA = %(96.751 ± 0.002) and very strong violation due to Freedman test as δ F = 0.01715 ± 0.00001. Furthermore, using the tomographic reconstruction of quantum states together a maximum-likelihood-technique (MLT) as the numerical optimization, we obtain the physical non-negative definite density operator which shows the nonseparability and entanglement of our prepared state. By having the maximum likelihood density operator, we calculate some important entanglement-measures and entanglement entropies. The Sagnac configuration provides bidirectional crystal pumping yields to high-rate entanglement source which is very applicable in quantum communication, sensing and metrology as well as quantum information protocols, and has potential to be used in quantum illumination-based LIDAR and free-space quantum key distribution (QKD).

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Measurement of entropy and quantum coherence properties of two type-I entangled photonic qubits

2021

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Using the type-I SPDC process in BBO nonlinear crystal, we generate a polarization-entangled state near to the maximally-entangled Bell-state with high-visibility (high-brightness) 98.50 ± 1.33% (87.71 ± 4.45%) for HV (DA) basis. We calculate the CHSH version of the Bell inequality, as a nonlocal realism test, and find a strong violation from the classical physics or any hidden variable theory, S = 2.71 ± 0.10. Via measuring the coincidence count rate in the SPDC process, we obtain the quantum efficiency of single-photon detectors around (25.5 ± 3.4)%, which is in good agreement to their manufacturer company. As expected, we verify the linear dependency of the CC rate vs. pump power of input CW-laser, which may yield to find the effective second-order susceptibility crystal. Using the theory of the measurement of qubits, includes a tomographic reconstruction of quantum states due to the linear set of 16 polarization-measurement, together with a maximum-likelihood-technique, which is based on the numerical optimization, we calculate the physical non-negative definite density matrices, which implies on the non-separability and entanglement of prepared state. By having the maximum likelihood density operator, we calculate precisely the entanglement measures such as Concurrence, entanglement of formation, tangle, logarithmic negativity, and different entanglement entropies such as linear entropy, Von-Neumann entropy, and Renyi 2-entropy. Finally, this high-brightness and low-rate entangled photons source can be used for short-range quantum measurements in the Lab.

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High-precision quantum transmittometry of DNA and methylene-blue using a frequency-entangled twin-photon beam in type-I SPDC

Cited by 9 publications

References 42 publications

Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Nonlocal realism tests and quantum state tomography in Sagnac-based type-II polarization-entanglement SPDC-source

Measurement of entropy and quantum coherence properties of two type-I entangled photonic qubits

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