A5056993645- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Neural Networks and Reservoir Computing
- Spectroscopy and Quantum Chemical Studies
- Advanced Electron Microscopy Techniques and Applications
- Advanced Memory and Neural Computing
- Neuroscience and Neural Engineering
- Semiconductor materials and devices
- Orthodontics and Dentofacial Orthopedics
- Particle Accelerators and Free-Electron Lasers
- Photocathodes and Microchannel Plates
- Cold Atom Physics and Bose-Einstein Condensates
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Molecular Junctions and Nanostructures
- Quantum and electron transport phenomena
- Dental Implant Techniques and Outcomes
- Dental Radiography and Imaging
Universidade Federal do Ceará
2008-2024
National Institute of Standards and Technology
2006-2019
University of Colorado Boulder
2019
Information Technology Laboratory
2006
University of Notre Dame
2002-2004
Teleporting a trapped-ion quantum gate Gating—controlling the state of one qubit conditioned on another—is key procedure in all information processors. As scale processors increases, qubits will need to interact over larger and distances, which presents an experimental challenge solid-state architectures. Wan et al. implemented 20-year-old theoretical proposal teleportation that allows separated effectively. They deterministically teleported controlled-NOT between two computational spatially...
Both discrete and continuous systems can be used to encode quantum information. Most computation schemes propose encoding qubits in two-level systems, such as a atom or an electron spin. Others exploit the use of infinite-dimensional system, harmonic oscillator. In "Encoding qubit oscillator" [Phys. Rev. A 64 012310 (2001)], Gottesman, Kitaev, Preskill (GKP) combined these approaches when they proposed fault-tolerant scheme which is encoded position momentum degrees freedom One advantage...
We discuss several methods to produce superpositions of optical coherent states (also known as "cat states"). Cat have remarkable properties that could allow them be powerful tools for quantum information processing and metrology. A number proposals how one can cat appeared in the literature recent years. describe these present a new simulation analysis incorporating practical issues such photon loss, detector inefficiency, limited strength nonlinear interactions. also examine each would...
We discuss the long-distance transmission of qubits encoded in optical coherent states. Through absorption, these suffer from two main types errors, namely reduction amplitude states and accidental application Pauli $Z$ operator. show how errors can be fixed using techniques teleportation error-correcting codes.
We present a method for multipartite entanglement purification of any stabilizer state shared by several parties. In our protocol each party measures the operators quantum error-correcting code on his or her qubits. The parties exchange their measurement results, detect correct errors, and decode desired purified state. give sufficient conditions codes that may be used in this procedure find Steane's seven-qubit is smallest to purify An error-detecting encodes two qubits six can also further...
Maximum-likelihood quantum-state tomography yields estimators that are consistent, provided the likelihood model is correct, but maximum-likelihood may have bias for any finite data set. The of an estimator difference between expected value estimate and true parameter being estimated. This paper investigates in widely used tomography. Our goal to understand how amount depends on factors such as purity state, number measurements performed, different bases which system measured. For this, we...
We investigate the generation of an entangled electron pair emerging from a system composed two quantum dots attached to superconductor Cooper beam splitter. take into account three processes: Crossed Andreev Reflection, cotuneling, and Coulomb interaction. Together, these processes play crucial roles in formation electronic states, with electrons being spatially separated dots. By using perturbation theory, we derive analytical effective model that allows simple picture intricate process...
We discuss the effects of imperfect photon detectors suffering from loss and noise on reliability linear optical quantum computers. show that for a given detector efficiency, there is maximum achievable success probability, increasing number ancillary photons used one controlled sign flip gate beyond critical point will decrease probability computer function correctly. have also performed simulations some small logic gates estimate efficiency levels required to properly.
Polarization of light has been used extensively in quantum information processing, and entanglement is essential to many areas research, including computing. Here we investigate the degree polarization a family states known as photon-added entangled coherent states. Such could serve means distribution key distribution. Using Stokes parameters $Q$ function, demonstrate that, general, two two-mode increases significantly with number added photons. And using concurrence, show that amount this...
Quantum state tomography aims to determine the quantum of a system from measured data and is an essential tool for information science. When dealing with continuous variable states light, often done by measuring field amplitudes at different optical phases using homodyne detection. The quadrature-phase measurement outputs variable, so reduce computational cost tomography, researchers discretize measurements. We show that this can be without significantly degrading fidelity between estimated...
We investigate the generation of an entangled electron pair emerging from a system composed two quantum dots attached to superconductor Cooper beam splitter.We take into account three processes: Crossed Andreev Reflection, cotunneling, and Coulomb interaction.Together, these processes play crucial roles in formation electronic states, with electrons being spatially separated dots.By using perturbation theory, we derive analytical effective model that allows simple picture intricate process...
We propose a scheme for implementing probabilistic controlled-NOT (CNOT) gate coherent state qubits using only linear optics and particular four-mode state. The proposed optical setup works, as CNOT gate, near-faithful when |α|2⩾25 independent of the input key element realizing is entangled
We present a method to estimate the amount of squeezing and temperature single-mode Gaussian harmonic oscillator state based on weighted least squares estimator applied measured Fock populations. Squeezing temperature, or equivalently quadrature variances, are essential parameters states used in various quantum communication sensing protocols. They often with homodyne-style detection, which requires phase reference such as local oscillator. Our allows estimation without reference, by using...