Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"photon pairs"”.
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High dimensional spatial entanglement with photon pairs
… a crystal with a laser to create entangled pairs of photons. In particular, it is an investigation of the properties of the entangled pairs that are created and on how their entanglement can be measured. We approach some of these questions both analytically and numerically. The work is …
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Counting statistics of a system to produce entangled photon pairs
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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CORRELATED PHOTON PAIRS AND MULTIPHOTON STATES FROM A COLD ATOMIC ENSEMBLE
Narrowband correlated photon pairs are vital for interfacing neutral atom systems and realizing distributed quantum networks. This thesis presents the realization and characterization of a high-brightness, temporally correlated photon-pair source at near-resonant wavelengths of 780 nm and 795 nm in …
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Generation, manipulation and detection of NIR and MIR entangled photon pairs
… was to bring the quantum world into integrated photonics by using the silicon platform and, therefore, permitting the integration of quantum photonics with electronics. The vision was to have low cost and mass manufacturable integrated quantum photonic circuits for a variety of different …
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Applications of correlated photon pairs : sub-shot noise interferometry and entanglement
… to a low-finesse cavity, we have generated photon pairs that are highly correlated in a non-classical way, as demonstrated by a large violation of the Cauchy-Schwartz inequality G = 760 +2100 -320 for a bin width T = 60 ns. Biphoton interferometry of the correlated pairs via the …
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Comparison, optimization, and application of various spontaneous parametric downconversion sources of polarization-entangled photon pairs
… makes it possible to create bright entangled-photon sources that can be used on platforms where weight and stability requirements are limiting factors, e.g., on aerial or even space-based mobile platforms, which could allow reconfigurable long-distance transfer of photonic qubits. …
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Applications of optical parametric downconversion : I. Self-phase locking, [and] II. Generation of entangled photon pairs in periodically-poled lithium niobate
… and control, but also as a source of twin photons and other nonclassical states of light. Advances in nonlinear materials, including engineered nonlinear interactions through the use of quasi-phase matching, have increased the flexibility and performance of many nonlinear optical devices. …
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Multidimensional fiber quantum light sources and their applications
… processes in optical fibers that can create photon pairs correlated in spatio-spectral degrees of freedom. Utilizing spatial light modulators, we show control over individual spontaneous four-wave mixing processes through precise beam shaping of the pump spatial mode. Employing stimulated …
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Effiziente Erzeugung verschränkter Photonenpaare
Efficient Generation of Entangled Photon-Pairs The first experiments with correlated photons have been performed in the context of EPR-Bell experiments on the realistic and local properties of quantum mechanics. The source used there produced pairs of polarization entangled photons from a 2-photon …
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Generation of fiber-coupled, nondegenerate, polarization-entangled photons for quantum communication
The production of polarization-entangled photon pairs from spontaneous parametric downconversion (SPDC) enables many applications of quantum information processing. In this thesis, we use type-0 phase-matched downconversion of pump photons from a 532 nm continuous-wave laser to generate 798 nm …
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Lightwave circuits for integrated Silicon Photonics
… technological advancements in integrated silicon photonics circuits aimed at developing an All-On-Chip device for quantum photonics experiments. The work has been carried out within the framework of project SiQuro, where the Silicon-On-Insulator platform is chosen to integrate all the components …
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Ultrafast sources of entangled photons for quantum information processing
… and metrology. Most of these applications use photons as carriers of quantum information. Therefore, engineering the quantum state of photons is essential for the realization of novel QIP schemes. A practical and flexible technique to generate high-purity entangled photon pairs is spontaneous …
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Applications of single-photon two-qubit quantum logic to the quantum information science
… information processing tasks using single-photon two-qubit (SPTQ) quantum logic. As an initial state of those tasks, I used various entangled photon pairs, and I describe development of a polarization entangled photon pair source based on a collinear spontaneous parametric down conversion …
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Photonic Entanglement for a Quantum Repeater
… thesis has been to develop a source of entangled photon pairs that is suitable for quantum repeaters and then use it to test some of the fundamental building blocks of a quantum repeater : the heralded creation of entangled photons by means of entanglement swapping with properties that allow …
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High performance photon-pair source based on a fiber-coupled periodically poled KTiOPO₄ waveguide
Photon-pair sources based on spontaneous parametric downconversion (SPDC) in a nonlinear crystal waveguide have been shown to be significantly more efficient than those in a bulk crystal. To utilize waveguide sources in quantum information processing (QIP) applications, it is highly desirable to …
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Optical nonlinear effects and photon pair production in modulated materials
… conditions in the vacuum can generate real photon pairs, which pop into existence from the zero-point energy. This surprising effect is known as the dynamical Casimir effect (DCE). In this thesis, we focus our attention on using the DCE as a route to experimentally study the quantum vacuum. …
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High-dimensional Quantum Key Distribution with Frequency Encoding
… demonstrate an indistinguishable heralded single-photon source, featuring time-energy entanglement elimination in the spontaneous parametric down-conversion (SPDC) process through custom engineering of phase-matching conditions. The heralded single-photon source is useful in measurement-based …
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Quantum applications of Raman-mediated photon-pair generation
Controllable generation of photon pairs is essential for the utilization of quantum pair states for quantum applications such as quantum communication, quantum cryptography, teleportation, and linear optics quantum computing. Raman scattering is one of the most fundamental light-matter interactions …
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Ultrabright source of polarization-entangled photons from cavity-enhanced downconversion
… source of entanglement. The goal is to produce pairs of photons which are not only polarization-entangled, but also have a high brightness within a narrow bandwidth. This novel source is more suitable than previous SPDC sources for transferring entanglement to future qubit storage such as a …
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Experimental study of the frequency correlation of space-time entangled photons
Space-time entangled photons generated from a continuous-wave parametric downconverter have a well defined sum-frequency despite having individual broad bandwidths. The narrowband frequency correlation that results from this well defined sum-frequency is examined experimentally. The measurements …
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