A semi-classical picture of quantum scattering
... estimated by Ct\^o\ for small t, the assumption is satisfied for some T+ > 0 and T- > 0 when ^+ or equivalently ^- is compactly supported in R^ \ {0}. If we forget the Uj and the corresponding positions Xj, for j / 0, the validity of (1.6) for any ^+,^- G L 2 ^), essentially depends on the global sh ...
... estimated by Ct\^o\ for small t, the assumption is satisfied for some T+ > 0 and T- > 0 when ^+ or equivalently ^- is compactly supported in R^ \ {0}. If we forget the Uj and the corresponding positions Xj, for j / 0, the validity of (1.6) for any ^+,^- G L 2 ^), essentially depends on the global sh ...
Weyl--Heisenberg Representations in Communication Theory
... The theoretical description of the communication in time–varying environments is of central relevance for further increase of the efficiency and the data rate of future transmission techniques. In particular, the quasi–statistical assumption widely used for mobile wireless communication channels is ...
... The theoretical description of the communication in time–varying environments is of central relevance for further increase of the efficiency and the data rate of future transmission techniques. In particular, the quasi–statistical assumption widely used for mobile wireless communication channels is ...
Physicalism and the Part-Whole Relation
... Quantum entanglement is a prominent counterexample to this kind of microexplanation. It is not, in general, possible to explain the state of compound quantum mechanical systems in terms of the states of the parts because quantum mechanics does not, in general, specify such states for the parts. This ...
... Quantum entanglement is a prominent counterexample to this kind of microexplanation. It is not, in general, possible to explain the state of compound quantum mechanical systems in terms of the states of the parts because quantum mechanics does not, in general, specify such states for the parts. This ...
On quantum detection and the square
... bility of a detection error when the states exhibit certain symmetries [7]; it is “pretty good” when the states to be distinguished are equally likely and almost orthogonal [9]; and it is asymptotically optimal [10]. Because of these properties, the SRM has been employed as a detection measurement i ...
... bility of a detection error when the states exhibit certain symmetries [7]; it is “pretty good” when the states to be distinguished are equally likely and almost orthogonal [9]; and it is asymptotically optimal [10]. Because of these properties, the SRM has been employed as a detection measurement i ...
Martin Raith - Publikationsserver der Universität Regensburg
... Outline of the Thesis In Chapter 1, we started with a very brief historical overview of quantum computation and the motivation for building a quantum computer. Chapter 2 is a more specific introduction. First, we briefly describe the best qubit candidates that are currently investigated, such as phot ...
... Outline of the Thesis In Chapter 1, we started with a very brief historical overview of quantum computation and the motivation for building a quantum computer. Chapter 2 is a more specific introduction. First, we briefly describe the best qubit candidates that are currently investigated, such as phot ...
Quantum non-demolition - Quantum Optics and Spectroscopy
... In the framework of this thesis a high fidelity Mølmer-Sørensen gate operation was implemented. Two ion Bell states and three ion GHZ states were created with a respective fidelity of 99.3% and 98.4% using 40 Ca+ ions. It was demonstrated that the Mølmer-Sørensen gate operation works nearly as well ...
... In the framework of this thesis a high fidelity Mølmer-Sørensen gate operation was implemented. Two ion Bell states and three ion GHZ states were created with a respective fidelity of 99.3% and 98.4% using 40 Ca+ ions. It was demonstrated that the Mølmer-Sørensen gate operation works nearly as well ...
Quantum Computational Complexity - Cheriton School of Computer
... I Definition of the subject and its importance The inherent difficulty, or hardness, of computational problems is a fundamental concept in computational complexity theory. Hardness is typically formalized in terms of the resources required by different models of computation to solve a given problem ...
... I Definition of the subject and its importance The inherent difficulty, or hardness, of computational problems is a fundamental concept in computational complexity theory. Hardness is typically formalized in terms of the resources required by different models of computation to solve a given problem ...
Theory of electron transport and magnetization dynamics in metallic
... U(1) gauge symmetry associated with conservation of some effective charge. In solids, there are several systems which have the U(1) gauge symmetry as a good approximation. Solids could thus display several types of effective electromagnetic fields. A typical example is a ferromagnetic metal. In ferr ...
... U(1) gauge symmetry associated with conservation of some effective charge. In solids, there are several systems which have the U(1) gauge symmetry as a good approximation. Solids could thus display several types of effective electromagnetic fields. A typical example is a ferromagnetic metal. In ferr ...
MULTIPARTICLE ENTANGLEMENT Sebastian Hartweg, Mario Berta (QSIT Seminar, 10.12.2012)
... fault-tolerant quantum computing1–3 and quantum communication, where they can enable protocols such as open-destination teleportation4 and secret sharing5. They play a role in fundamental tests of quantum mechanics6 and enable improved signal-to-noise ratios in interferometry7. Cat states are very s ...
... fault-tolerant quantum computing1–3 and quantum communication, where they can enable protocols such as open-destination teleportation4 and secret sharing5. They play a role in fundamental tests of quantum mechanics6 and enable improved signal-to-noise ratios in interferometry7. Cat states are very s ...
Spin and Charge Transport through Driven Quantum Dot Systems
... dimensional conductors–, single atomic or molecular junctions. Among them, quantum dots deserve special importance for being a realization of zero dimensional systems with a discrete energy distribution. For this reason, they are also know as artificial atoms[2, 3, 4, 5], with the particularity that ...
... dimensional conductors–, single atomic or molecular junctions. Among them, quantum dots deserve special importance for being a realization of zero dimensional systems with a discrete energy distribution. For this reason, they are also know as artificial atoms[2, 3, 4, 5], with the particularity that ...
SOME BOUND STATE PROBLEMS IN QUANTUM MECHANICS In
... ZZ d/2 d/2 1 dξdx = ωd λ V (x)− dx. |ξ|2 +λV (x)<0 ...
... ZZ d/2 d/2 1 dξdx = ωd λ V (x)− dx. |ξ|2 +λV (x)<0 ...
Relativistic quantum information theory and quantum reference frames
... phenomena where both quantum and gravitational effects are important. There is research into developing a fundamentally new theory that will combine the phenomena and experimental predictions from both of these existing theories: a theory of quantum gravity. This would be a theory of microscopic mat ...
... phenomena where both quantum and gravitational effects are important. There is research into developing a fundamentally new theory that will combine the phenomena and experimental predictions from both of these existing theories: a theory of quantum gravity. This would be a theory of microscopic mat ...
Strong Interactions
... Strong Interactions • Take place between quarks which make up the hadrons • Magnitude of coupling can be estimated from decay probability (or width Γ) of unstable baryons. ...
... Strong Interactions • Take place between quarks which make up the hadrons • Magnitude of coupling can be estimated from decay probability (or width Γ) of unstable baryons. ...
DECOHERENCE AND DYNAMICAL DECOUPLING IN SOLID-STATE SPIN QUBITS Wayne Martin Witzel
... I appreciate help that I have received from many people in order to accomplish this work. First of all, the Condensed Matter Theory Center (CMTC) has been an enriching environment for my graduate research. I have asked innumerable questions, from mundane to profound, of present and past CMTC post-do ...
... I appreciate help that I have received from many people in order to accomplish this work. First of all, the Condensed Matter Theory Center (CMTC) has been an enriching environment for my graduate research. I have asked innumerable questions, from mundane to profound, of present and past CMTC post-do ...
Bell's theorem
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Bell's theorem is a ‘no-go theorem’ that draws an important distinction between quantum mechanics (QM) and the world as described by classical mechanics. This theorem is named after John Stewart Bell.In its simplest form, Bell's theorem states:Cornell solid-state physicist David Mermin has described the appraisals of the importance of Bell's theorem in the physics community as ranging from ""indifference"" to ""wild extravagance"". Lawrence Berkeley particle physicist Henry Stapp declared: ""Bell's theorem is the most profound discovery of science.""Bell's theorem rules out local hidden variables as a viable explanation of quantum mechanics (though it still leaves the door open for non-local hidden variables). Bell concluded:Bell summarized one of the least popular ways to address the theorem, superdeterminism, in a 1985 BBC Radio interview: