Experimentos usando qudits de camino en altas dimensiones para información cuántica = Experiments using high dimensional path qudits for quantum information.
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Date
2019
Authors
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Journal ISSN
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Publisher
Universidad de Concepción
Abstract
ional quantum states is presented. Weak coherent pulses in the single photon level
are prepared when a continuous wave 690 nm laser is pulsed with an Acousto
Optical Modulator (AOM) and attenuated using neutral filters. The quantum
states are encoded in the transverse linear momentum (TLM) of individual photons. The manipulation of TLM is performed by Spatial Light Modulators (SLMs),
who display sets of d transmissive apertures (slits) giving the photon d alternative
paths to propagate through, addressing the d dimensional state |ψi the user wants
to prepare. Two SLMs combined manipulate the real and imaginary part of the
coefficients of |ψi, completing the generation stage of the setup. The SLMs are fully
automated using Field Programmable Gate Array (FPGA) electronics. Once the
state is generated, we can choose a previously calculated projective measurement
hφ| to be implemented. This is done preparing a new set of d slits in another pair
of SLMs, located in the measurement stage of the setup. Finally, an Avalanche
Photo Diode masked with a 10 µm pinhole measures the overlap probability of
|hφψi| 2 from the accumulated statistics of the binary APD outcomes. Since the
visibility of the output signal of the is around 0.98, a wide variety of quantum
tasks can be performed using the presented experimental setup.
Description
Tesis presentada para optar al grado de Doctor en Ciencias Físicas.
Keywords
Teoría Cuántica, Fotones, Computación Cuántica