2 edition of Quantum state control and characterization in an optical lattice. found in the catalog.
Quantum state control and characterization in an optical lattice.
Stefan Henrik Myrskog
Written in English
In this dissertation I present experimental work on the measurement and manipulation of the center-of-mass motion of laser-cooled atoms. The first experiment described demonstrates cooling of an atom cloud by "delta-kick cooling". A thermal cloud of atoms in a vacuum expands ballistically, generating correlations between position and momentum. An appropriate momentum kick, proportional to position, results in slowing down all the atoms in the cloud. Through this technique a cloud of atoms can be cooled by greater than a factor of 10, preserving phase-space density, but decreasing the number density of atoms.By using laser-cooled atoms, it is also possible to confine atoms in potentials created by the AC-Stark shift of the atomic energy levels. Using interfering lasers to create the Stark shift, atoms are confined in a sinusoidal potential called an optical lattice. After preparing atoms in the lowest-energy band of the lattice, a spatial displacement can create coherent superpositions of many states of the potential. A combination of time delays and secondary displacements allows the measurement of the Q (Husimi) and W (Wigner) quasi-probability distributions, each of which completely characterizes the motional state of the atoms. Alternatively, a shallow lattice that only support two long-lived states can be used. The two-state system may be characterized with far fewer measurements, and furthermore, can be used as a model system for a qubit, a quantum representation of a single bit of information, useful for quantum computation. We demonstrate reconstruction of the density matrix in the 2-state system. The two-state system has be further used to characterize the physical action of an operation. By preparing a complete set of input density matrices we perform quantum process tomography for the intrinsic decoherence of the lattice, and two operations that correspond to single qubit rotations.
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Optical spectroscopy is being used for the characterization of the quantum electronic state of nanoscale materials, particularly alkali metal clusters incorporated in the space of zeolite crystals. For example, potassium clusters were incorporated into cage-type LTA and channel-type MOR zeolites that demonstrated even ferromagnetism at low. The control and imaging of single atoms in an optical lattice remains a huge challenge, but David Weiss and co-workers have recently shown how such imaging can work in a three-dimensional array of atoms By using a high-resolution optical lens, the researchers were able to image two-dimensional planes in a three-dimensional optical lattice.
Jan. 10, Quantum algorithms for quantum chemistry and quantum materials science; Dec. 12, Matrix product state algorithms for Gaussian fermionic states; Dec. 11, An Exactly Solvable Model for a 4+1D Beyond-Cohomology Symmetry Protected Topological Phase; Dec. 10, Energy spectrum and current-phase relation of a nanowire Josephson junction close to the topological transition. •Lattice vibrations: acoustic and optical branches In three-dimensional lattice with s atoms per unit cell there are 3s phonon branches: 3 acoustic, 3s - 3 optical •Phonon - the quantum of lattice vibration. Energy ħω; momentum ħq •Concept of the phonon density of states •Einstein and Debye models for lattice heat capacity. Debye File Size: 1MB.
From Eqs. (32) and Eqs. (28) we can note that for both, two-state walk and the Grover walk, the amplitude at any position (x, z) for a given time t is dependent on the amplitude at the four diagonally opposite sites at time t − Fig. 2(a), the probability distribution of the 50 step DQW on a square lattice using the Pauli basis scheme without the external coin operation (θ = 0) is by: Bakr, Waseem Sulaiman, Jonathon I. Gillen, Amy Wan-Chih Peng, Simon Fölling, and Markus Greiner. A quantum gas microscope for detecting single atoms in a Hubbard-regime optical lattice. Nature ():
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An optical lattice is formed by the interference of counter-propagating laser beams, creating a spatially periodic polarization pattern.
The resulting periodic potential may trap neutral atoms via the Stark shift. Atoms are cooled and congregate in the locations of potential minima. The resulting arrangement of trapped atoms resembles a crystal lattice and can be used for quantum simulation. entangled quantum state of atoms confined in optical lattice with high fidelity (>99%) and short a "pair-wise control method" (Fig.
9 Entangling the atoms in an optical lattice for quantum. Quantum Process Tomography on vibrational states of atoms in an Optical Lattice S. Myrskog, J. Fox, M. Mitchell and A. Steinberg Dept. of Physics, University of Toronto, 60 St.
George St. Toronto,Ont., Canada, M5S 1A7 Quantum process tomography is used to fully characterize the evolution of the quantum vibra-tional state of atoms. Quantum Control of Vibrational States in an Optical Lattice Chao Zhuang Doctor of Philosophy Graduate Department of Physics University of Toronto In this thesis, I present an experimental study of quantum control techniques for transfer-ring population between vibrational states of atoms trapped in an optical lattice.
ResultsAuthor: Chao Zhuang. Nippon Telegraph and Telephone has proposed a method for generating a large-scale entangled quantum state of ultracold atoms in an optical lattice with.
A quantum gas 'microscope' is now demonstrated that bridges the two approaches and can be used to detect single atoms held in a Hubbard-regime optical lattice.
This quantum gas microscope may. In physics, lattice field theory is the study of lattice models of quantum field theory, that is, of field theory on a spacetime that has been discretized onto a lattice. Details. Although most lattice field theories are not exactly solvable, they are of tremendous appeal because they can be studied by simulation on a hopes that, by performing simulations on larger and larger.
Tokyo Institute of Technology. (, June 25). Control of quantum state of optical phonon in diamond induced by ultrashort light pulses. ScienceDaily. Retrieved April 3, from www. Using these couplings one can evolve the state of a trapped atom in a quantum coherent fashion, and prepare pure quantum states by resolved-sideband Raman cooling.
We explore the use of atoms bound in optical lattices to study quantum tunneling and the generation of macroscopic superposition states in a double-well by: Quantum Control of Interacting Bosons in Periodic Optical Lattice Article in Physica E Low-dimensional Systems and Nanostructures 42(5)– March with 30 Reads How we measure 'reads'.
Quantum State Reduction by Matter-Phase-Related Measurements in Optical Lattices Wojciech Kozlowski1, Santiago F. Caballero-Benitez1,2 & Igor B. Mekhov1,3 A many-body atomic system coupled to quantized light is subject to weak measurement.
Instead of coupling light to the on-site density, we consider the quantum backaction due to the measurement.
Mountains of potential - optical lattices offer unique control over many-body quantum systems. An optical lattice is able to trap an atom because the electric fields of the lasers induce an electric dipole moment in the atom. The interaction between this dipole moment, which is oscillating, and the electricFile Size: KB.
Complete Characterization of Quantum-Optical Processes Mirko Lobino, 1Dmitry Korystov, Connor Kupchak, 1Eden Figueroa, Barry C. Sanders, 1and A. Lvovsky ∗ 1 Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada∗ The technologies of quantum information and quantum control are rapidly improving, but full exploitation.
Preparation of a quantum state with one molecule at each site of an optical lattice Article in Nature Physics 2(10) June with 13 Reads How we measure 'reads'. The canonical Hamiltonian of quantum optics is the Jaynes–Cummings model, originally proposed to describe spontaneous emission [47, ].
j Consider an ensemble of N s spins coupled to a single mode of a resonant cavity, ω ng N s ≫ 1, the Holstein–Primakoff transformation [, ] applies and the excitations of the spin system (magnons) can be treated as bosonic particles.
By means of optimal control techniques we model and optimize the manipulation of the external quantum state center-of-mass motion of atoms trapped in adjustable optical potentials.
We consider in detail the cases of both noninteracting and interacting atoms moving between neighboring sites in a lattice of a double-well optical by: Our system is based on an atomic quantum gas trapped in an optical lattice inside a high-finesse optical cavity.
The strength of the short-range on-site interactions is controlled by means of the. Quantum state transfer with ultracold atoms 2 systems extremely accessible with the possibility to address, even locally in limited and controllable regions of space, most of the system parameters.
The combined action of trapping potentials, optical lattices and low temperature cooling techniques, provide a. Our focus lies on quantum state estimation, entanglement characterization and time-evolution of many-body systems.
Furthermore, we work with a novel approach to quantum simulation, where complex quantum states are prepared variationally, using a feedback loop between a classical computer and our quantum computer. Quantum simulations with ultracold atoms in optical lattices Christian Gross1* and Immanuel Bloch1,2* Quantum simulation, a subdiscipline of quantum computation, can provide valuable insight into difficult quantum problems in physics or chemistry.
Ultracold atoms in optical lattices represent an ideal platform for simulations of quantum many Cited by:. T1 - Quantum computing with neutral atoms in an optical lattice. AU - Deutsch, Ivan H.
AU - Brennen, Gavin K. AU - Jessen, Poul S. PY - /1/1. Y1 - /1/1. N2 - We present a proposal for quantum information processing with neutral atoms trapped in optical lattices as by: To create the optical lattice, the researchers suggest using lasers tuned far from the resonant frequency of the atoms to prevent photon scattering, the main source of decoherence.
“The optical lattice is like an egg carton,” says Deutsch, and the atoms are like marbles trapped in Author: Meher Antia.II. QUANTUM HALL STATE OF BOSONS ON A LATTICE A. Model The fractional quantum Hall effect occurs for electrons conﬁned in a two-dimensional 2D plane under the presence of a perpendicular strong magnetic ﬁeld.
If N is the number of electrons in the system and N is the number of magnetic ﬂuxes measured in units of the quantum magnetic ﬂux 0.