By Linda Sansoni
Quantum info technological know-how has came upon nice experimental good fortune by means of exploiting unmarried photons. to this point, besides the fact that, nearly all of quantum optical experiments use large-scale (bulk) optical components bolted all the way down to an optical bench, an method that finally limits the complexity and balance of the quantum circuits required for quantum technology and expertise. the conclusion of complicated optical schemes concerning huge numbers of components calls for the creation of waveguide know-how to accomplish the specified scalability, balance and miniaturization of the equipment. This thesis studies on astounding findings within the box of built-in units for quantum info. right here the polarization of the photon is proven to provide an appropriate measure of freedom for encoding quantum details in built-in platforms. an important effects obstacle: the quantum interference of polarization entangled photons in an on-chip directional coupler; the conclusion of a Controlled-NOT (CNOT) gate working with polarization qubits; the belief of a quantum stroll of bosons and fermions in an ordered optical lattice and the quantum simulation of Anderson localization of bosons and fermions simulated through polarization entangled photons in a disordered quantum stroll. The findings awarded during this thesis signify an immense step in the direction of the mixing of an entire quantum photonic test in a chip.
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Additional info for Integrated Devices for Quantum Information with Polarization Encoded Qubits
This task is achieved through optical devices which act on various degrees of freedom of light, for example on linear momentum, like beam splitters (BS), or on the angular momentum of light (holograms, spiral phase plates, q-plates ), or on the polarization (waveplates and polarizing beam splitters). I focus on photonic devices acting on the polarization degree of freedom. The basic element used to manipulate the polarization state of single photons is the waveplate (WP), a birefringent optical device which alters the polarization state of a light wave traveling through it by introducing a phase delay between the orthogonal components H and V.
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1 Lithography Lithography is typically the transfer of a pattern to a photosensitive material by selective exposure to a radiation source. A photosensitive material is a material that experiences a change in its physical properties when exposed to a radiation source. g. by masking some of the radiation) the pattern of the radiation on the material is transferred to the material exposed, as the properties of the exposed and unexposed regions differs. In lithography for micromachining, the photosensitive material used is typically a photoresist (also called resist, other photosensitive polymers are also used).
Integrated Devices for Quantum Information with Polarization Encoded Qubits by Linda Sansoni