Continuous Variable Quantum Information: Gaussian States and
... These distributions are referred to as ‘quasi’-probability because they sum up to unity, yet do not behave entirely as one would expect from probability distributions. In particular, there are (infinitely many) quantum states ρ for which the function Wρs is not a regular probability distribution for ...
... These distributions are referred to as ‘quasi’-probability because they sum up to unity, yet do not behave entirely as one would expect from probability distributions. In particular, there are (infinitely many) quantum states ρ for which the function Wρs is not a regular probability distribution for ...
Quantum nanophotonic phase switch with a single atom.
... and atomic population decay rates are given by k 5 2p 3 25 GHz and c 5 2p 3 6 MHz, respectively. The reflection coefficient in equation (1) changes sign depending on the presence (g . 1) or absence (g 5 0) of a strongly coupled atom. If the atom is prepared in a superposition of internal states, one ...
... and atomic population decay rates are given by k 5 2p 3 25 GHz and c 5 2p 3 6 MHz, respectively. The reflection coefficient in equation (1) changes sign depending on the presence (g . 1) or absence (g 5 0) of a strongly coupled atom. If the atom is prepared in a superposition of internal states, one ...
Weyl--Heisenberg Representations in Communication Theory
... corresponds to time shifts. Hence, in this view it is simpler to work with a joint diagonalization. Following, the description of such operations are reduced to its spectral representation. However, this is not sufficient to describe most of the problems occurring in physics and engineering. One may ...
... corresponds to time shifts. Hence, in this view it is simpler to work with a joint diagonalization. Following, the description of such operations are reduced to its spectral representation. However, this is not sufficient to describe most of the problems occurring in physics and engineering. One may ...
A hands-on introduction to single photons and quantum mechanics for undergraduates
... with our students, introducing concepts as needed to explain observed results. Most of the experiments described have been performed by others in both pedagogical and research settings. The goal of this paper is to offer a slightly different pedagogical approach than previously reported and to clari ...
... with our students, introducing concepts as needed to explain observed results. Most of the experiments described have been performed by others in both pedagogical and research settings. The goal of this paper is to offer a slightly different pedagogical approach than previously reported and to clari ...
ANTI-MATTER FROM PRIMORDIAL BLACK HOLES
... Within the Wheeler, Misner and DeWitt QGD, the BB singularity is not resolved could it be different in the specific quantum theory of Riemannian geometry called LQG? KEY questions: How close to the BB does smooth space-time make sense ? Is inflation safe ? Is the BB singularity solved as the hydro ...
... Within the Wheeler, Misner and DeWitt QGD, the BB singularity is not resolved could it be different in the specific quantum theory of Riemannian geometry called LQG? KEY questions: How close to the BB does smooth space-time make sense ? Is inflation safe ? Is the BB singularity solved as the hydro ...
Relativistic Adiabatic Approximation and Geometric Phase
... generalization of the quantum adiabatic approximation. The main purpose of this article is to develop such a generalization for a charged Klein-Gordon field Φ in an arbitrary globally hyperbolic spacetime (M, g) which is minimally coupled to an electromagnetic potential A, as well as an arbitrary sc ...
... generalization of the quantum adiabatic approximation. The main purpose of this article is to develop such a generalization for a charged Klein-Gordon field Φ in an arbitrary globally hyperbolic spacetime (M, g) which is minimally coupled to an electromagnetic potential A, as well as an arbitrary sc ...
Quantum Teleportation
... Interestingly, the teleportation may be used with different kinds of qubits, allowing us to transform a calculated result qubit to a different kind of qubit (e.g. to transform an Ion Trap qubit, useful for computing, with a photon, which is handier for communication). Alice and Bob can preshare larg ...
... Interestingly, the teleportation may be used with different kinds of qubits, allowing us to transform a calculated result qubit to a different kind of qubit (e.g. to transform an Ion Trap qubit, useful for computing, with a photon, which is handier for communication). Alice and Bob can preshare larg ...
Entanglement-seeded, dual, optical parametric amplification
... and for = we obtain the N = 4 N00N state 共兩4 , 0典 + 兩0 , 4典兲 / 冑2. As discussed earlier, if this state is used to measure a path-length difference in a Mach-Zehnder interferometer, it achieves a doubling in sensitivity compared to the standard shot-noise limit. Regarding use as a source for quan ...
... and for = we obtain the N = 4 N00N state 共兩4 , 0典 + 兩0 , 4典兲 / 冑2. As discussed earlier, if this state is used to measure a path-length difference in a Mach-Zehnder interferometer, it achieves a doubling in sensitivity compared to the standard shot-noise limit. Regarding use as a source for quan ...
An Atomic Source of Quantum Light - Institute for Quantum Science
... Full setup for the generation of narrowband single photons. . . . . . . . . Spatial filtering in the setup: (a) shows the competition between beam divergence and spatial separation obtained by beam propagation. In (b) the overlap between the beams as a function of propagation is calculated for the e ...
... Full setup for the generation of narrowband single photons. . . . . . . . . Spatial filtering in the setup: (a) shows the competition between beam divergence and spatial separation obtained by beam propagation. In (b) the overlap between the beams as a function of propagation is calculated for the e ...
Quantum Symmetric States - UCLA Department of Mathematics
... Definition The tail σ-algebra is the intersection of the σ-algebras generated by {xN , xN +1 , . . .} as N goes to ∞. Thus, the expectation E can be seen as an integral (w.r.t. a probability measure on the tail algebra) — that is, as a sort of convex combination — of expectations with respect to whi ...
... Definition The tail σ-algebra is the intersection of the σ-algebras generated by {xN , xN +1 , . . .} as N goes to ∞. Thus, the expectation E can be seen as an integral (w.r.t. a probability measure on the tail algebra) — that is, as a sort of convex combination — of expectations with respect to whi ...
The many-worlds interpretation of quantum - Philsci
... we don’t directly observe macroscopic superpositions. One might make an acceptable theory by making physically precise the conditions under which reduction occurs, either by describing an instant where it occurs, or by slightly modifying the Schrijdinger equation so that it remains as it is for micr ...
... we don’t directly observe macroscopic superpositions. One might make an acceptable theory by making physically precise the conditions under which reduction occurs, either by describing an instant where it occurs, or by slightly modifying the Schrijdinger equation so that it remains as it is for micr ...
Exponential algorithmic speedup by quantum walk Andrew M. Childs, Richard Cleve, Enrico Deotto,
... a central vertex, we know that the wrong move happened after k/2 steps (k can only be even due to the structure of Gn ) and we can backtrack to that point and take the other edge. After only O(n2 ) steps this procedure will reach the exit.2 We now describe how the graphs Gn are modified so that they ...
... a central vertex, we know that the wrong move happened after k/2 steps (k can only be even due to the structure of Gn ) and we can backtrack to that point and take the other edge. After only O(n2 ) steps this procedure will reach the exit.2 We now describe how the graphs Gn are modified so that they ...
AntalyaQuantumComputingTutorial
... The heat produced by a super dense computing engine is proportional with the number of elementary computing circuits, thus, with the volume of the engine. The heat dissipated grows as the cube of the radius of the device. To prevent the destruction of the engine we have to remove the heat through a ...
... The heat produced by a super dense computing engine is proportional with the number of elementary computing circuits, thus, with the volume of the engine. The heat dissipated grows as the cube of the radius of the device. To prevent the destruction of the engine we have to remove the heat through a ...