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.
Results
Showing 1 to 20 of 22 for “"Photon Pair"”.
-
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 …
-
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. …
-
Network Integration of a Quantum Dot Entangled Photon-pair Source
Sub-Poissonian entangled photon-pair sources based on semiconductor quantum dots are promising devices for the construction of a secure quantum network, thanks to their natural lack of multi photon-pair generation. In the previous decades, we have witnessed the achievements on a large variety of …
-
Analysis of a Deterministic Entangled Photon Pair Source using Single Photons
… involve the use of deterministic entangled photon pair sources. On the other hand heralded entangled photon pair sources have been proposed independently both with parametric down conversion source and single photon sources. We modify the latter scheme to implement it as an on demand …
-
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 …
-
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 …
-
Manipulation of photonic quantum states: From generation, engineering, and characterization to storage and retrieval
… As one of the types of information carrier, the photon is suitable for transmission, is relatively easy to control, and interacts only weakly with its environment. These features make it an ideal candidate for quantum information protocols. This thesis presents various new techniques in the …
-
Development of 1GHz Clocked Entangled LEDs for Fibre Networks
… have been well established as sources of single photons and entangled photon-pairs, both of which are essential for realising quantum networks. To be compatible with real-world applications, such a source must further conform to basic requirements including operation at telecom wavelengths and …
-
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 …
-
Single-photon frequency upconversion for long-distance quantum teleportation and communication
Entanglement generation, single-photon detection, and frequency translation that preserves the polarization quantum state of the photons are essential technologies for long distance quantum communication protocols. This thesis investigates the application of polarization entanglement to quantum …
-
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 …
-
Components for quantum computing based on optical transitions in single quantum dots
… here a novel method of creating entangled photon pair emitters is presented, in which an electric field is used to tune the energy structure of single QDs to allow the fidelity of the emitted entangled state to be increased. In addition, a technique for the creation of energy-tunable …
-
Spectroscopy and rational chemical design of single emitters for quantum photonics
… heterogeneity, emission linewidths, and singlephoton emission purity of single lead halide perovskite quantum dots (PQDs) in dilute solutions using photon-correlation spectroscopy. I identify PQD's unique minimal inhomogeneous broadening and remarkable tunability of the biexciton Auger …
-
Geometry and Light in Quantum Optical Systems
… We first consider two coupled systems, a pair of 2-level systems and pair harmonic oscillators, with specific couplings to the environment through a Lindblad master equation. We look at observables such as optical spectrum to see the complex eigenvalues of the non-Hermitian systems. We …
-
Multidimensional fiber quantum light sources and their applications
… quantum information processing. When paired with other degrees of freedom such as spectral modes, fibers become a versatile platform for studying multidimensional quantum systems. In this thesis, we present our recent progress in fundamental studies and applications of multidimensional …
-
Efficient superconducting-nanowire single-photon detectors and their applications in quantum optics
Superconducting-nanowire single-photon detectors (SNSPDs) are an emerging technology for infrared photon counting and detection. Their advantages include good device efficiency, fast operating speed, low dark-count rate, low timing jitter, free running mode, and no afterpulsing. The challenges to …
-
ON THE SPECTRA OF GAMMA-RAY BURSTS AT HIGH ENERGIES
… energy above 30 keV is contained in the >1 MeV photons.</p><p>Tests of spectral models yield mixed results. Neither a power law nor a thermal model can adequately explain all of the observed spectra. Some GRS spectra show clear curvature and cannot be well-fit by a power law. However, a number …
-
Growth, characterization and implementation of semiconductor sources of highly entangled photons
Sources of single and polarization-entangled photons are an essential component in a variety of potential quantum information applications. Suitable emitters need to generate photons deterministically and at fast repetition rates, with highest degrees of single-photon purity, entanglement and …
-
Quantum dot-based Entangled-Light Emitting Diodes (E-LED) for quantum relays
Sources of entangled pairs of photons can be used for encoding signals in quantum-encrypted communications, allowing a sender, Alice, and a receiver, Bob, to exchange keys without the possibility of eavesdropping. In fact, any quantum information system would require single and entangled photons to …
Page 1 of 2