scholarly journals Quantum imaging of a polarisation sensitive phase pattern with hyper-entangled photons

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Manpreet Kaur ◽  
Mandip Singh
Keyword(s):  
Degrees Of Freedom ◽  
Single Photon ◽  
Entangled Photons ◽  
Phase Pattern ◽  
Quantum Superposition ◽  
Quantum Imaging ◽  
Quantum Image ◽  
Sensitive Phase ◽  
Entangled Photon Pairs ◽  
Concept Theory

AbstractA transparent polarisation sensitive phase pattern makes a polarisation dependent transformation of quantum state of photons without absorbing them. Such an invisible pattern can be imaged with quantum entangled photons by making joint quantum measurements on photons. This paper shows a long path experiment to quantum image a transparent polarisation sensitive phase pattern with hyper-entangled photon pairs involving momentum and polarisation degrees of freedom. In the imaging configuration, a single photon interacts with the pattern while the other photon, which has never interacted with the pattern, is measured jointly in a chosen polarisation basis and in a quantum superposition basis of its position which is equivalent to measure its momentum. Individual photons of each hyper-entangled pair cannot provide a complete image information. The image is constructed by measuring the polarisation state and position of the interacting photon corresponding to a measurement outcome of the non-interacting photon. This paper presents a detailed concept, theory and free space long path experiments on quantum imaging of polarisation sensitive phase patterns.

scholarly journals Quantum image distillation

2019 ◽  
Vol 5 (10) ◽  
pp. eaax0307 ◽  
Author(s):  
Hugo Defienne ◽  
Matthew Reichert ◽  
Jason W. Fleischer ◽  
Daniele Faccio
Keyword(s):  
Single Photon ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Measured Data ◽  
Quantum States ◽  
Signal To Noise ◽  
Quantum Imaging ◽  
Intensity Correlation ◽  
Quantum Image ◽  
Single Photon Counting

Imaging with quantum states of light promises advantages over classical approaches in terms of resolution, signal-to-noise ratio, and sensitivity. However, quantum detectors are particularly sensitive sources of classical noise that can reduce or cancel any quantum advantage in the final result. Without operating in the single-photon counting regime, we experimentally demonstrate distillation of a quantum image from measured data composed of a superposition of both quantum and classical light. We measure the image of an object formed under quantum illumination (correlated photons) that is mixed with another image produced by classical light (uncorrelated photons) with the same spectrum and polarization, and we demonstrate near-perfect separation of the two superimposed images by intensity correlation measurements. This work provides a method to mix and distinguish information carried by quantum and classical light, which may be useful for quantum imaging, communications, and security.

scholarly journals Scattering in Terms of Bohmian Conditional Wave Functions for Scenarios with Non-Commuting Energy and Momentum Operators

Entropy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 408
Author(s):  
Matteo Villani ◽  
Guillermo Albareda ◽  
Carlos Destefani ◽  
Xavier Cartoixà ◽  
Xavier Oriols
Keyword(s):  
Single Particle ◽  
Degrees Of Freedom ◽  
Single Photon ◽  
Open Quantum Systems ◽  
Wave Functions ◽  
Practical Application ◽  
Light Matter Interaction ◽  
Pure States ◽  
Energy And Momentum ◽  
Full Quantum

Without access to the full quantum state, modeling quantum transport in mesoscopic systems requires dealing with a limited number of degrees of freedom. In this work, we analyze the possibility of modeling the perturbation induced by non-simulated degrees of freedom on the simulated ones as a transition between single-particle pure states. First, we show that Bohmian conditional wave functions (BCWFs) allow for a rigorous discussion of the dynamics of electrons inside open quantum systems in terms of single-particle time-dependent pure states, either under Markovian or non-Markovian conditions. Second, we discuss the practical application of the method for modeling light–matter interaction phenomena in a resonant tunneling device, where a single photon interacts with a single electron. Third, we emphasize the importance of interpreting such a scattering mechanism as a transition between initial and final single-particle BCWF with well-defined central energies (rather than with well-defined central momenta).

scholarly journals Multiparticle quantum plasmonics

Nanophotonics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1243-1269 ◽  
Author(s):  
Chenglong You ◽  
Apurv Chaitanya Nellikka ◽  
Israel De Leon ◽  
Omar S. Magaña-Loaiza
Keyword(s):  
Quantum Dynamics ◽  
Degrees Of Freedom ◽  
Single Photon ◽  
Quantum Systems ◽  
Many Body ◽  
Statistical Fluctuations ◽  
Quantum Plasmonics ◽  
Control Of Quantum Systems ◽  
Multiparticle Systems ◽  
Quantum Photonics

AbstractA single photon can be coupled to collective charge oscillations at the interfaces between metals and dielectrics forming a single surface plasmon. The electromagnetic near-fields induced by single surface plasmons offer new degrees of freedom to perform an exquisite control of complex quantum dynamics. Remarkably, the control of quantum systems represents one of the most significant challenges in the field of quantum photonics. Recently, there has been an enormous interest in using plasmonic systems to control multiphoton dynamics in complex photonic circuits. In this review, we discuss recent advances that unveil novel routes to control multiparticle quantum systems composed of multiple photons and plasmons. We describe important properties that characterize optical multiparticle systems such as their statistical quantum fluctuations and correlations. In this regard, we discuss the role that photon-plasmon interactions play in the manipulation of these fundamental properties for multiparticle systems. We also review recent works that show novel platforms to manipulate many-body light-matter interactions. In this spirit, the foundations that will allow nonexperts to understand new perspectives in multiparticle quantum plasmonics are described. First, we discuss the quantum statistical fluctuations of the electromagnetic field as well as the fundamentals of plasmonics and its quantum properties. This discussion is followed by a brief treatment of the dynamics that characterize complex multiparticle interactions. We apply these ideas to describe quantum interactions in photonic-plasmonic multiparticle quantum systems. We summarize the state-of-the-art in quantum devices that rely on plasmonic interactions. The review is concluded with our perspective on the future applications and challenges in this burgeoning field.

scholarly journals Generation of tunable entanglement and violation of a Bell-like inequality between different degrees of freedom of a single photon

2014 ◽  
Vol 90 (5) ◽  
Author(s):  
Adam Vallés ◽  
Vincenzo D'Ambrosio ◽  
Martin Hendrych ◽  
Michal Mičuda ◽  
Lorenzo Marrucci ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Single Photon

scholarly journals Violation of Leggett-type inequalities in the spin-orbit degrees of freedom of a single photon

2013 ◽  
Vol 88 (3) ◽  
Author(s):  
Filippo Cardano ◽  
Ebrahim Karimi ◽  
Lorenzo Marrucci ◽  
Corrado de Lisio ◽  
Enrico Santamato
Keyword(s):  
Degrees Of Freedom ◽  
Single Photon ◽  
Spin Orbit

High-dimensional quantum key distribution using polarization-phase encoding: security analysis

2020 ◽  
Vol 18 (06) ◽  
pp. 2050031
Author(s):  
Ali Mehri-Toonabi ◽  
Mahdi Davoudi Darareh ◽  
Shahrooz Janbaz
Keyword(s):  
Quantum Key Distribution ◽  
Degrees Of Freedom ◽  
Single Photon ◽  
Transmission Rate ◽  
Security Analysis ◽  
Key Distribution ◽  
High Dimensional ◽  
Effective Transmission ◽  
Special Case ◽  
Polarization Phase

In this work, we introduce a high-dimensional polarization-phase (PoP)-based quantum key distribution protocol, briefly named PoP[Formula: see text], where [Formula: see text] is the dimension of a hybrid quantum state including polarization and phase degrees of freedom of the same photon, and [Formula: see text] is the number of mutually unbiased bases. We present a detailed description of the PoP[Formula: see text] protocol as a special case, and evaluate its security against various individual and coherent eavesdropping strategies, and in each case, we compare it with the BB84 and the two-dimensional (TD)-PoP protocols. In all the strategies, the error threshold and the effective transmission rate of the PoP[Formula: see text] protocol are far greater than the other two protocols. Unlike most high-dimensional protocols, the simplicity of producing and detecting the qudits and the use of conventional components (such as traditional single-photon sources and quantum channels) are among the features of the PoP[Formula: see text] protocol.

Quantum image sharpness estimation based on the Laplacian operator

2020 ◽  
Vol 18 (03) ◽  
pp. 2050008 ◽  
Author(s):  
She-Xiang Jiang ◽  
Ri-Gui Zhou ◽  
Wen-Wen Hu
Keyword(s):  
Laplacian Operator ◽  
The Novel ◽  
Superposition State ◽  
Image Sharpness ◽  
Quantum Superposition ◽  
Quantum Image ◽  
Essential Idea ◽  
Execution Speed ◽  
The Mean ◽  
Classical Image

In order to solve the high complexity of classical image processing, a quantum scheme for image sharpness estimation based on the Laplacian operator is proposed. The mean of grayscale gradients of all pixels is regarded as the sharpness estimation metric. A new quantum image representation model is presented by extending the Novel Enhanced Quantum Representation (NEQR) model, which is greatly useful for quantum image convolution. In quantum platforms, it has been shown that the mean calculation of numbers is rather difficult because the numbers are stored in a quantum superposition state. In order to solve this problem, we put forward an algorithm which essential idea is cyclically shifting the superposition state and iteratively calculating the mean of the new one and the original state. The mean can be obtained from the superposition state by only one quantum measurement. By analyzing the space complexity and time complexity, the scheme is far superior to classical ones in terms of resource consumption and execution speed. In addition, the results of simulation experiments show that for noiseless images, the performance of the scheme is consistent with subjective visual perception of images sharpness.

Design and Analysis of the Secure Scheme for Quantum Positioning based on Entangled Photon Pair

2016 ◽  
Vol 12 (2) ◽  
pp. 22-35
Author(s):  
Hong-Mei Huang ◽  
Lu-Ping Xu
Keyword(s):  
Photon Pair ◽  
Entangled Photons ◽  
Coincidence Counting ◽  
Positioning Accuracy ◽  
Photon Pairs ◽  
Bandwidth Limitation ◽  
Accuracy Of Measurement ◽  
Entangled Photon Pairs ◽  
Spatial Positioning ◽  
User Location

Positioning accuracy of the traditional positioning has been limited because of the power and bandwidth limitation, quantum entanglement and compression technology can greatly improve the accuracy of measurement and synchronization. So, using the coherence of entangled photons and the principle of quantum spatial positioning, the scheme of quantum positioning with entangled photon pair was proposed, which was consisted of ground unit, satellite and the user three parts, the ground unit respectively sent EPR entangled photon pairs to two satellites three times, then the entangled photon pairs were sent to user by satellites, User carrying HOM interferometer, when the coincidence counting rate reaches the maximum three times, the user location can be got by computing. In the end, the quantum positioning and the traditional positioning technology were compared from the aspects of positioning accuracy, safety and so on.

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