scholarly journals Ελεγχόμενη διάδοση ακτινοβολίας σε νανοδομές

2017 ◽  
Author(s):  
Κωνσταντίνος Μπλέκος
Keyword(s):  
Optical Control ◽  
Quantum Gates ◽  
Entangled States ◽  
Universal Quantum ◽  
Quantum Optical

Σε αυτήν την εργασία χρησιμοποιήσαμε μεθόδους Κβαντικού Οπτικού ελέγχου (Quantum Optical control), για να χειριστούμε τις κβαντικές καταστάσεις νανοδομών με τρόπο χρήσιμο για έρευνα Κβαντικής Πληροφορίας. Χρησιμοποιούμε Ημιαγώγιμες Κβαντικές Τελείες (SQD) ως τη βασική μας νανοδομή. Τις εμβαπτίζουμε σε περιβάλλον άλλων νανοδομών τέτοιο που να ενισχύει τον έλεγχο των καταστάσεων. Ο κύριος στόχος του ελέγχου στην παρούσα εργασία είναι η δημιουργία σύμπλεκτων καταστάσεων (entangled states). Συγκεκριμένα, δείχνουμε ότι μπορεί να επιτευχθεί σύμπλεξη καταστάσεων σημαντικού βαθμού σε δύο ρεαλιστικά μοντέλα που μελετήσαμε: μια κβαντική τελεία σε οπτική μικρο-κοιλότητα και δύο κβαντικές τελείες συζευγμένες με μεταλλικό νανοσωματίδιο. Δευτερεύοντος, δείχνουμε ότι με τα μοντέλα αυτά, μπορούν να υλοποιηθούν καθολικές κβαντικές πύλες (universal quantum gates).

scholarly journals Topological protection of biphoton states

Science ◽  
2018 ◽  
Vol 362 (6414) ◽  
pp. 568-571 ◽  
Author(s):  
Andrea Blanco-Redondo ◽  
Bryn Bell ◽  
Dikla Oren ◽  
Benjamin J. Eggleton ◽  
Mordechai Segev
Keyword(s):  
Quantum Information ◽  
Thermal Environment ◽  
Propagation Constant ◽  
Quantum Systems ◽  
Quantum Gates ◽  
Scattering Loss ◽  
Spatial Features ◽  
Quantum Optical ◽  
Nontrivial Topology ◽  
Large Quantum

The robust generation and propagation of multiphoton quantum states are crucial for applications in quantum information, computing, and communications. Although photons are intrinsically well isolated from the thermal environment, scaling to large quantum optical devices is still limited by scattering loss and other errors arising from random fabrication imperfections. The recent discoveries regarding topological phases have introduced avenues to construct quantum systems that are protected against scattering and imperfections. We experimentally demonstrate topological protection of biphoton states, the building block for quantum information systems. We provide clear evidence of the robustness of the spatial features and the propagation constant of biphoton states generated within a nanophotonics lattice with nontrivial topology and propose a concrete path to build robust entangled states for quantum gates.

scholarly journals On the design of molecular excitonic circuits for quantum computing: the universal quantum gates

2020 ◽  
Vol 22 (5) ◽  
pp. 3048-3057 ◽  
Author(s):  
Maria A. Castellanos ◽  
Amro Dodin ◽  
Adam P. Willard
Keyword(s):  
Quantum Computing ◽  
Organic Dye ◽  
Quantum Gates ◽  
Dye Molecules ◽  
Universal Quantum ◽  
Excitonic States

This manuscript presents a strategy for controlling the transformation of excitonic states through the design of circuits made up of coupled organic dye molecules.

Single- and two-qubit universal quantum gates in photonic Ti:LiNbO3 circuits

Optik ◽  
2019 ◽  
Vol 182 ◽  
pp. 907-921 ◽  
Author(s):  
Shahram MohammadNejad ◽  
Anahita KhodadadKashi ◽  
Hossein Arab
Keyword(s):  
Quantum Gates ◽  
Universal Quantum

Generation of four-photon polarization entangled states with cross-Kerr nonlinearity

2015 ◽  
Vol 13 (05) ◽  
pp. 1550024 ◽  
Author(s):  
Meiyu Wang ◽  
Fengli Yan
Keyword(s):  
Kerr Nonlinearity ◽  
Entangled States ◽  
Entangled State ◽  
Kerr Medium ◽  
Coherent Light ◽  
Photon Polarization ◽  
Beam Splitters ◽  
Ghz States ◽  
Different Types ◽  
Quantum Optical

We show how to prepare three different types of four-photon polarization entangled states among four modes. The scheme only use cross-Kerr medium, polarization beam splitters and X homodyne measurements on coherent light fields, which can be efficiently implemented in quantum optical laboratories. GHZ states and symmetric Dick states can be generated in deterministic way based on the scheme. With the possible availability of suitable strong Kerr nonlinearity, another type of entangled state called genuine four-photon entangled state can be realized as well.

scholarly journals Theory of quantum optical control of a single spin in a quantum dot

2004 ◽  
Vol 69 (7) ◽  
Author(s):  
Pochung Chen ◽  
C. Piermarocchi ◽  
L. J. Sham ◽  
D. Gammon ◽  
D. G. Steel
Keyword(s):  
Quantum Dot ◽  
Optical Control ◽  
Single Spin ◽  
Quantum Optical
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