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Quantum phases of out of equilibrium systems in quantum information problems

Abstract

The present project has two different and complementary parts in order to explore the relation between decoherence and out of equilibrium systems used for quantum information processing. 1) In its first part the project explores the physics of systems out of equilibrium, with special emphasis in quantum computers with a large number of degrees of freedom. Specifically, I will study quantum memories protected by topological quantum error correction codes. 2) The second part of the project complements the first part by studying the physics of a single qubit out of equilibrium in the presence of decoherence sources. More specifically, I will consider the problem of quantum dots coupled to reservoirs in a dissipative environment simulated by quantum fluctuations on the circuit. Albeit a simple model, it will serve as a starting point to the understanding of decoherence due to fluctuations on qubit fields control. The project has the following specific aims:Aim 1.1: determine the quantum error threshold for a topological quantum error correction code (the surface code) in the presence of correlated errors for many error correction cycles.Aim 2.1: study a quantum dot coupled to two terminals in the presence of a noise circuit.Aim 2.2: study a double quantum dot coupled to two terminals in the presence of a noise circuit. (AU)

Articles published in Agência FAPESP Newsletter about the research grant:
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VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)

Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
LOPEZ-DELGADO, D. A.; NOVAIS, E.; MUCCIOLO, E. R.; CALDEIRA, A. O.. Long-time efficacy of the surface code in the presence of a super-Ohmic environment. Physical Review A, v. 95, n. 6, . (14/26356-9)
NOVAIS, E.; STANFORTH, A. J.; MUCCIOLO, EDUARDO R.. Surface code fidelity at finite temperatures. Physical Review A, v. 95, n. 4, . (14/26356-9)
ZHANG, GU; NOVAIS, E.; BARANGER, HAROLD U.. Rescuing a Quantum Phase Transition with Quantum Noise. Physical Review Letters, v. 118, n. 5, . (14/26356-9)
NOVAIS, E.; STANFORTH, A. J.; MUCCIOLO, EDUARDO R.. Surface code fidelity at finite temperatures. PHYSICAL REVIEW A, v. 95, n. 4, p. 14-pg., . (14/26356-9)
LOPEZ-DELGADO, D. A.; NOVAIS, E.; MUCCIOLO, E. R.; CALDEIRA, A. O.. Long-time efficacy of the surface code in the presence of a super-Ohmic environment. PHYSICAL REVIEW A, v. 95, n. 6, p. 8-pg., . (14/26356-9)
ZHANG, GU; NOVAIS, E.; BARANGER, HAROLD U.. Conductance of a dissipative quantum dot: Nonequilibrium crossover near a non-Fermi-liquid quantum critical point. Physical Review B, v. 104, n. 16, . (14/26356-9)