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11 papers · 2 filters
Harmonic oscillator kicked by spin measurements: a Floquet-like system without classical analogous
Bento Montenegro, Nadja K. Bernardes, Fernando Parisio
We present a kicked harmonic oscillator where the impulsive driving is provided by stroboscopic measurements on an ancillary degree of freedom and not by the canonical quantization…
Low-rank quantum state preparation
Israel F. Araujo, Carsten Blank, Ismael C. S. Araújo +1
Ubiquitous in quantum computing is the step to encode data into a quantum state. This process is called quantum state preparation, and its complexity for non-structured data is exp…
Approximating Invertible Maps by Recovery Channels: Optimality and an Application to Non-Markovian Dynamics
Lea Lautenbacher, Fernando de Melo, Nadja K. Bernardes
We investigate the problem of reversing quantum dynamics, specifically via optimal Petz recovery maps. We focus on typical decoherence channels, such as dephasing, depolarizing and…
Double sparse quantum state preparation
Tiago M. L. de Veras, Leon D. da Silva, Adenilton J. da Silva
Initializing classical data in a quantum device is an essential step in many quantum algorithms. As a consequence of measurement and noisy operations, some algorithms need to reini…
Configurable sublinear circuits for quantum state preparation
Israel F. Araujo, Daniel K. Park, Teresa B. Ludermir +3
The theory of quantum algorithms promises unprecedented benefits of harnessing the laws of quantum mechanics for solving certain computational problems. A persistent obstacle to us…
Lackadaisical quantum walk in the hypercube to search for multiple marked vertices
Luciano S. de Souza, Jonathan H. A. de Carvalho, Tiago A. E. Ferreira
Adding self-loops at each vertex of a graph improves the performance of quantum walks algorithms over loopless algorithms. Many works approach quantum walks to search for a single…