Quantum engineering of light
http://hdl.handle.net/2117/23898
2018-06-18T16:51:57ZInequivalence of entanglement, steering, and Bell nonlocality for general measurements
http://hdl.handle.net/2117/79010
Inequivalence of entanglement, steering, and Bell nonlocality for general measurements
Quintino, Marco Tulio; Vértesi, Tamas; Cavalcanti, Daniel; Augusiak, Remigiusz; Demianowicz, Maciej; Acín, Antonio; Brunner, Nicolas
Einstein-Podolsky-Rosen steering is a form of inseparability in quantum theory commonly acknowledged to be intermediate between entanglement and Bell nonlocality. However, this statement has so far only been proven for a restricted class of measurements, namely, projective measurements. Here we prove that entanglement, one-way steering, two-way steering, and nonlocality are genuinely different considering general measurements, i.e., single round positive-operator-valued measures. Finally, we show that the use of sequences of measurements is relevant for steering tests, as they can be used to reveal “hidden steering.”
2015-11-11T12:06:43ZQuintino, Marco TulioVértesi, TamasCavalcanti, DanielAugusiak, RemigiuszDemianowicz, MaciejAcín, AntonioBrunner, NicolasEinstein-Podolsky-Rosen steering is a form of inseparability in quantum theory commonly acknowledged to be intermediate between entanglement and Bell nonlocality. However, this statement has so far only been proven for a restricted class of measurements, namely, projective measurements. Here we prove that entanglement, one-way steering, two-way steering, and nonlocality are genuinely different considering general measurements, i.e., single round positive-operator-valued measures. Finally, we show that the use of sequences of measurements is relevant for steering tests, as they can be used to reveal “hidden steering.”Enhancement of the sensitivity of a temperature sensor based on fiber Bragg gratings via weak value amplification
http://hdl.handle.net/2117/78513
Enhancement of the sensitivity of a temperature sensor based on fiber Bragg gratings via weak value amplification
Salazar-Serrano, L. J.; Barrera, D.; Amaya, W.; Sales, S.; Pruneri, Valerio; Capmany, J.; Pérez Torres, Juan
We present a proof-of-concept experiment aimed at increasing the sensitivity of temperature sensors implemented
with Fiber Bragg gratings by making use of a weak value amplification scheme. The technique requires
only linear optics elements for its implementation, and appears as a promising method for extending the range
of temperatures changes detectable to increasingly lower values than state-of the-art sensors can currently
provide. The device implemented here is able to generate a shift of the centroid of the spectrum of a pulse of
∼ 0.035 nm/◦C, a nearly fourfold increase in sensitivity over the same Fiber Bragg Grating system interrogated
using standard methods.
2015-10-29T15:07:50ZSalazar-Serrano, L. J.Barrera, D.Amaya, W.Sales, S.Pruneri, ValerioCapmany, J.Pérez Torres, JuanWe present a proof-of-concept experiment aimed at increasing the sensitivity of temperature sensors implemented
with Fiber Bragg gratings by making use of a weak value amplification scheme. The technique requires
only linear optics elements for its implementation, and appears as a promising method for extending the range
of temperatures changes detectable to increasingly lower values than state-of the-art sensors can currently
provide. The device implemented here is able to generate a shift of the centroid of the spectrum of a pulse of
∼ 0.035 nm/◦C, a nearly fourfold increase in sensitivity over the same Fiber Bragg Grating system interrogated
using standard methods.Coherent delocalization: views of entanglement in different scenarios
http://hdl.handle.net/2117/78511
Coherent delocalization: views of entanglement in different scenarios
León-Montiel, Roberto de J.; Vallès, Adam; Moya-Cessa, H. M.; Pérez Torres, Juan
The concept of entanglement was originally introduced to explain correlations existing between two spatially separated systems, that cannot be described using classical ideas. Interestingly, in recent years, it has been shown that similar correlations can be observed when considering different degrees of freedom of a single system, even a classical one. Surprisingly, it has also been suggested that entanglement might be playing a relevant role in certain biological processes, such as the functioning of pigment-proteins that constitute light-harvesting complexes of photosynthetic bacteria. The aim of this work is to show that the presence of entanglement in all of these different scenarios should not be unexpected, once it is realized that the very same mathematical structure can describe all of them. We show this by considering three different, realistic cases in which the only condition for entanglement to exist is that a single excitation is coherently delocalized between the different subsystems that compose the system of interest.
2015-10-29T14:48:18ZLeón-Montiel, Roberto de J.Vallès, AdamMoya-Cessa, H. M.Pérez Torres, JuanThe concept of entanglement was originally introduced to explain correlations existing between two spatially separated systems, that cannot be described using classical ideas. Interestingly, in recent years, it has been shown that similar correlations can be observed when considering different degrees of freedom of a single system, even a classical one. Surprisingly, it has also been suggested that entanglement might be playing a relevant role in certain biological processes, such as the functioning of pigment-proteins that constitute light-harvesting complexes of photosynthetic bacteria. The aim of this work is to show that the presence of entanglement in all of these different scenarios should not be unexpected, once it is realized that the very same mathematical structure can describe all of them. We show this by considering three different, realistic cases in which the only condition for entanglement to exist is that a single excitation is coherently delocalized between the different subsystems that compose the system of interest.Demonstration of a highly-sensitive tunable beam displacer with no use of beam deflection based on the concept of weak value amplification
http://hdl.handle.net/2117/76491
Demonstration of a highly-sensitive tunable beam displacer with no use of beam deflection based on the concept of weak value amplification
Salazar-Serrano, Luis José; Guzmán, David A.; Valencia, Alejandra; Pérez Torres, Juan
We report the implementation of a highly sensitive tunable beam displacer based on the concept of weak value amplification, that allows to displace the centroid of a Gaussian beam a distance much smaller than its beam width without the need to deflect the direction of propagation of the input beam with movable optical elements. The beam’s centroid position can be displaced by controlling the linear polarization of the output beam, and the dependence between the centroid’s position and the angle of polarization is linear.
2015-08-03T14:28:58ZSalazar-Serrano, Luis JoséGuzmán, David A.Valencia, AlejandraPérez Torres, JuanWe report the implementation of a highly sensitive tunable beam displacer based on the concept of weak value amplification, that allows to displace the centroid of a Gaussian beam a distance much smaller than its beam width without the need to deflect the direction of propagation of the input beam with movable optical elements. The beam’s centroid position can be displaced by controlling the linear polarization of the output beam, and the dependence between the centroid’s position and the angle of polarization is linear.Tunable beam displacer
http://hdl.handle.net/2117/27096
Tunable beam displacer
Luis José, Salazar-Serrano; Valencia, Alejandra; Pérez Torres, Juan
We report the implementation of a tunable beam displacer, composed of a polarizing beam splitter (PBS) and two mirrors, that divides an initially polarized beam into two parallel beams whose separation can be continuously tuned. The two output beams are linearly polarized with either vertical or horizontal polarization and no optical path difference is introduced between them. The wavelength dependence of the device as well as the maximum separation between the beams achievable is limited mainly by the PBS characteristics.
2015-03-27T14:47:53ZLuis José, Salazar-SerranoValencia, AlejandraPérez Torres, JuanWe report the implementation of a tunable beam displacer, composed of a polarizing beam splitter (PBS) and two mirrors, that divides an initially polarized beam into two parallel beams whose separation can be continuously tuned. The two output beams are linearly polarized with either vertical or horizontal polarization and no optical path difference is introduced between them. The wavelength dependence of the device as well as the maximum separation between the beams achievable is limited mainly by the PBS characteristics.Generation of tunable entanglement and violation of a Bell-like inequality between different degrees of freedom of a single photon
http://hdl.handle.net/2117/24823
Generation of tunable entanglement and violation of a Bell-like inequality between different degrees of freedom of a single photon
Vallés, Adam; Ambrosio, Vincenzo D'; Hendrych, Martin; Micuda, Micha; Marrucci, Lorenzo; Sciarrino, Fabio; Pérez Torres, Juan
2014-11-24T15:34:04ZVallés, AdamAmbrosio, Vincenzo D'Hendrych, MartinMicuda, MichaMarrucci, LorenzoSciarrino, FabioPérez Torres, Juan