Texas A&M University LibrariesTexas A&M University LibrariesTexas A&M University Libraries
    • Help
    • Login
    OAKTrust
    View Item 
    •   OAKTrust Home
    • Colleges and Schools
    • Office of Graduate and Professional Studies
    • Electronic Theses, Dissertations, and Records of Study (2002– )
    • View Item
    •   OAKTrust Home
    • Colleges and Schools
    • Office of Graduate and Professional Studies
    • Electronic Theses, Dissertations, and Records of Study (2002– )
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Quantum Coherence Effects in Novel Quantum Optical Systems

    Thumbnail
    View/Open
    SETE-DISSERTATION.pdf (2.524Mb)
    Date
    2012-10-19
    Author
    Sete, Eyob Alebachew
    Metadata
    Show full item record
    Abstract
    Optical response of an active medium can substantially be modified when coherent superpositions of states are excited, that is, when systems display quantum coherence and interference. This has led to fascinating applications in atomic and molecular systems. Examples include coherent population trapping, lasing without inversion, electromagnetically induced transparency, cooperative spontaneous emission, and quantum entanglement. We study quantum coherence effects in several quantum optical systems and find interesting applications. We show that quantum coherence can lead to transient Raman lasing and lasing without inversion in short wavelength spectral regions--extreme ultraviolet and x-ray--without the requirement of incoherent pumping. For example, we demonstrate transient Raman lasing at 58.4 nm in Helium atom and transient lasing without inversion at 6.1 nm in Helium-like Boron (triply-ionized Boron). We also investigate dynamical properties of a collective superradiant state prepared by absorption of a single photon when the size of the sample is larger than the radiation wavelength. We show that for large number of atoms such a state, to a good approximation, decays exponentially with a rate proportional to the number of atoms. We also find that the collective frequency shift resulting from repeated emission and reabsorption of short-lived virtual photons is proportional to the number of species in the sample. Furthermore, we examine how a position-dependent excitation phase affects the evolution of entanglement between two dipole-coupled qubits. It turns out that the coherence induced by position-dependent excitation phase slows down the otherwise fast decay of the two-qubit entanglement. We also show that it is possible to entangle two spatially separated and uncoupled qubits via interaction with correlated photons in a cavity quantum electrodynamics setup. Finally, we analyze how quantum coherence can be used to generate continuous-variable entanglement in quantum-beat lasers in steady state and propose possible implementation in quantum lithography.
    URI
    http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11400
    Subject
    Quantum coherence effects
    extreme ultraviolet and x-ray lasers
    transient lasing without inversion
    transient Raman lasing
    superradiance
    Collective Lamb (frequency) shift
    dipole-coupled qubit entanglement
    light-to-matter entanglement transfer
    quantum beat laser
    continuous-variable entanglement
    quantum lithography
    Collections
    • Electronic Theses, Dissertations, and Records of Study (2002– )
    Citation
    Sete, Eyob Alebachew (2012). Quantum Coherence Effects in Novel Quantum Optical Systems. Doctoral dissertation, Texas A&M University. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2012 -08 -11400.

    Related items

    Showing items related by title, author, creator and subject.

    • Quantum tunneling, quantum computing, and high temperature superconductivity 

      Wang, Qian (Texas A&M University, 2005-02-17)
      In this dissertation, I have studied four theoretical problems in quantum tunneling, quantum computing, and high-temperature superconductivity. I have developed a generally-useful numerical tool for analyzing impurity-induced ...
    • Quantum Error Correcting Codes and Fault-Tolerant Quantum Computation over Nice Rings 

      Lee, Sangjun (2017-06-29)
      Quantum error correcting codes play an essential role in protecting quantum information from the noise and the decoherence. Most quantum codes have been constructed based on the Pauli basis indexed by a finite field. With ...
    • Quantum Measurement and Its Applications in Quantum Optical Systems 

      Fan, Longfei (2018-08-03)
      Quantum measurement is the cornerstone of quantum computing and quantum information. It has many exciting applications. Various quantum optical systems are key to experimental physics because of their high precision and ...

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Advanced Search

    Browse

    All of OAKTrustCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDepartmentThis CollectionBy Issue DateAuthorsTitlesSubjectsDepartment

    My Account

    LoginRegister

    Statistics

    View Usage Statistics
    Help and Documentation

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV