Tese
Emaranhamento, medidas quânticas gerais e instrumentos quânticos
Fecha
2023-01-30Autor
Pinto, Douglas Franco
Institución
Resumen
In this work, the asymmetry properties of quantum states associated with the Hamiltonian
generator of the dynamics of the magnetic dipole interaction are investigated and their relationships with the production of entanglement are identified. Are also explored the types
of separable or partially entangled quantum states that can be used as a resource in the
entanglement distribution protocol, where we use IBM quantum processors to test the results with simulations and experiments performed remotely. Furthermore, a state preparation algorithm is presented that allows simulating and performing experiments with general
quantum measurements and quantum instruments, as well as noisy quantum channels. In
the topic about the properties of asymmetry and entanglement production, classes of pure
and mixed quantum states consisting of 2 qubits evolved under magnetic dipole interaction (MDI) are considered.The asymmetry measure used is based on the Wigner-Yanase
skew information between the quantum state and the Hamiltonian of the IDM, whose dependence is provided by the interaction parameters and initial conditions of the system. The
local asymmetry associated with the evolved state is investigated, which is characterized by
its dependence on the interaction parameters, local and temporal parameters, allowing the
establishment of indirect relationships with the entanglement dynamics generated by MDI.
The asymmetry related to the element of the unitary group responsible for the dynamics
of the MDI is also analyzed, being useful to understand the dynamic character regarding
the Wigner-Yanase asymmetry and to establish dynamic links with other properties. On
the other hand, regarding the entanglement distribution protocol, the role of separable and
partially entangled states are explored in the context of the Bell-diagonal class of states,
analyzing the probabilistic entanglement distribution, where it involves selective projective
measures, and the deterministic entanglement distribution, where it involves the action of
non-selective general quantum measurements. Finally, with the proposal of a state preparation algorithm based on the relationship between the action of quantum channels and
isometry, it was possible to carry out simulations and experiments on IBM quantum processors in general quantum measurements, quantum instruments and noisy quantum channels
applied to qudits, allowing, in this way, to handle and develop in a simpler way the applications that until then were complex to simulate.