Experiment and the foundations of quantum physics
... experimental progress in recent years. For reasons of space, the author discusses mainly experiments related to the Einstein-Podolsky-Rosen paradox and Bell’s theorem, that is, to quantum entanglement. Not only have such fundamental experiments realized many historic proposals, they also helped to s ...
... experimental progress in recent years. For reasons of space, the author discusses mainly experiments related to the Einstein-Podolsky-Rosen paradox and Bell’s theorem, that is, to quantum entanglement. Not only have such fundamental experiments realized many historic proposals, they also helped to s ...
Optimal quantum cloning of orbital angular momentum photon
... guishable. If the two photons are made distinguishable by their internal quantum state, for example encoded in the polarization π or in other degrees of freedom, the coalescence effect vanishes. Now, if one of the two photons involved in the process is in a given input state to be cloned and the othe ...
... guishable. If the two photons are made distinguishable by their internal quantum state, for example encoded in the polarization π or in other degrees of freedom, the coalescence effect vanishes. Now, if one of the two photons involved in the process is in a given input state to be cloned and the othe ...
Quantum annealing with manufactured spins
... qubit temperature. The key conclusion we draw from Fig. 3b is that our qubit dynamics is best characterized as being quantum mechanical in nature for T=80 mK. The system evolves to its ground state through a process of quantum annealing. But so far we have shown this only for an individual qubit. It ...
... qubit temperature. The key conclusion we draw from Fig. 3b is that our qubit dynamics is best characterized as being quantum mechanical in nature for T=80 mK. The system evolves to its ground state through a process of quantum annealing. But so far we have shown this only for an individual qubit. It ...
From Classical to Wave-Mechanical Dynamics
... de Broglie’s matter waves. Just like the external potential V (~r), the Wave Potential Q(~r, E) is “encountered” by the particles along their motion, and plays, once more, the basic role of mutually coupling the trajectories relevant to each mono-energetic matter wave. Once more, the presence of the ...
... de Broglie’s matter waves. Just like the external potential V (~r), the Wave Potential Q(~r, E) is “encountered” by the particles along their motion, and plays, once more, the basic role of mutually coupling the trajectories relevant to each mono-energetic matter wave. Once more, the presence of the ...
1 Why do we need position operator in quantum theory?
... expressed in terms of momentum variables. On quantum level the physical meaning of such a spatial distribution is not fundamental. Our general conclusion is as follows. Since the results of existing fundamental quantum theories describing interactions on quantum level (QED, electroweak theory and QC ...
... expressed in terms of momentum variables. On quantum level the physical meaning of such a spatial distribution is not fundamental. Our general conclusion is as follows. Since the results of existing fundamental quantum theories describing interactions on quantum level (QED, electroweak theory and QC ...
Physics Today
... face of a pond. The mathemany consider her to be dématical description of physmodé, uninteresting, and difficult. In her youth, she ical systems allows for more exacting comparisons. was more attractive. Her inconsistencies were taken Dynamic similarity, the cornerstone of laboratory as paradoxes th ...
... face of a pond. The mathemany consider her to be dématical description of physmodé, uninteresting, and difficult. In her youth, she ical systems allows for more exacting comparisons. was more attractive. Her inconsistencies were taken Dynamic similarity, the cornerstone of laboratory as paradoxes th ...
Seeing a single photon without destroying it
... events are sampled per frequency step. Ideally, these probabilities are equal to the conditional probabilities Pg/0(n) and Pg/1(n) of detecting the meter in g if there is 0 or 1 photon in C. As expected, we obtain two sinusoidal fringe patterns, p phaseshifted with respect to each other (Fig. 2). Th ...
... events are sampled per frequency step. Ideally, these probabilities are equal to the conditional probabilities Pg/0(n) and Pg/1(n) of detecting the meter in g if there is 0 or 1 photon in C. As expected, we obtain two sinusoidal fringe patterns, p phaseshifted with respect to each other (Fig. 2). Th ...
Quantum-Fluctuation-Driven Crossover from a Dilute Bose
... I. INTRODUCTION The extraordinary success of ultracold quantum gases largely stems from the simplicity with which the physics at the many-body level can be controlled and described, allowing access to a wide range of theoretical models of general interest [1]. Notably, the actual many-body interacti ...
... I. INTRODUCTION The extraordinary success of ultracold quantum gases largely stems from the simplicity with which the physics at the many-body level can be controlled and described, allowing access to a wide range of theoretical models of general interest [1]. Notably, the actual many-body interacti ...
Lower Bounds on Matrix Rigidity via a Quantum
... It should be noted that the use of quantum computing is not strictly necessary for either of our results. The first is proved in two steps: (1) using the quantum approach we show that every a × b submatrix of H has rank at least ab/n and (2) using a non-quantum argument we show that an e with small ...
... It should be noted that the use of quantum computing is not strictly necessary for either of our results. The first is proved in two steps: (1) using the quantum approach we show that every a × b submatrix of H has rank at least ab/n and (2) using a non-quantum argument we show that an e with small ...
Quantum Algorithms and the Genetic Code
... problem, but it is not easy to quantify it in mathematical terms. Often we can explain various observed features of living organisms [1]. The explanation becomes more and more believable, as more and more of its ingredients are verified experimentally [3]. Yet even when definite predictions exist, a ...
... problem, but it is not easy to quantify it in mathematical terms. Often we can explain various observed features of living organisms [1]. The explanation becomes more and more believable, as more and more of its ingredients are verified experimentally [3]. Yet even when definite predictions exist, a ...
PAGE Marie Curie actions Intra-European Fellowships Part B
... test the relevance of the thermal time hypothesis in various contexts. Our work in ref.[12] is based on Hislop-Longo’s computation9 of the modular groupk for a diamond’s shape region of Minkovsky space. In this example it turns out that the modular group coincides with the proper-time translation of ...
... test the relevance of the thermal time hypothesis in various contexts. Our work in ref.[12] is based on Hislop-Longo’s computation9 of the modular groupk for a diamond’s shape region of Minkovsky space. In this example it turns out that the modular group coincides with the proper-time translation of ...
Realization of a Knill-Laflamme-Milburn controlled
... their negligible interaction with the environment, however, the fact that they do not readily interact with one-another is problematic for the realization of a CNOT or other entangling interaction. Consequently it was widely believed that matter systems, such as an atom or atom-like system [6], or a ...
... their negligible interaction with the environment, however, the fact that they do not readily interact with one-another is problematic for the realization of a CNOT or other entangling interaction. Consequently it was widely believed that matter systems, such as an atom or atom-like system [6], or a ...
Bormio - Indico
... CP-violating (CPV) scattering processes are needed at the phase boundaries to wall into the create brokenthe phase. In this phase, the rate ofthat sphaleron particle number asymmetries bias thetransitions sphaleronsistostrongly create more baryons than create particle number asymmetries the sphalero ...
... CP-violating (CPV) scattering processes are needed at the phase boundaries to wall into the create brokenthe phase. In this phase, the rate ofthat sphaleron particle number asymmetries bias thetransitions sphaleronsistostrongly create more baryons than create particle number asymmetries the sphalero ...
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... structure can also be found in the stationary states of a Hydrogen atom in a strong magnetic field [see illustration]. The smoothness of the quantum wave forms is preserved from point-to-point. But when one steps back to view the whole picture, the fingerprint of Chaos emerges. It is possible to con ...
... structure can also be found in the stationary states of a Hydrogen atom in a strong magnetic field [see illustration]. The smoothness of the quantum wave forms is preserved from point-to-point. But when one steps back to view the whole picture, the fingerprint of Chaos emerges. It is possible to con ...
Finite temperature correlations of the Ising chain in transverse field
... where we have returned to physical units. At the scale of the characteristic rate ΓR , the dynamics of the system involves intrinsic quantum effects (responsible for the non-Lorentzian lineshape) which cannot be neglected; description by an effective classical model would require that ΓR kB T /h̄, ...
... where we have returned to physical units. At the scale of the characteristic rate ΓR , the dynamics of the system involves intrinsic quantum effects (responsible for the non-Lorentzian lineshape) which cannot be neglected; description by an effective classical model would require that ΓR kB T /h̄, ...
Quantum State Transfer via Noisy Photonic and Phononic Waveguides
... to fulfill T ≫ 1=κ max , with κ max the maximum value of κ1;2 ðtÞ. For finite durations, the effect on the fidelity scales linearly with the noise intensity but quickly vanishes for κmax T ≳ 10, above which F ≥ 0.99. In all other figures of this work, we use κ max T ¼ 20. In Fig. 2(b), we show the e ...
... to fulfill T ≫ 1=κ max , with κ max the maximum value of κ1;2 ðtÞ. For finite durations, the effect on the fidelity scales linearly with the noise intensity but quickly vanishes for κmax T ≳ 10, above which F ≥ 0.99. In all other figures of this work, we use κ max T ¼ 20. In Fig. 2(b), we show the e ...
Spontaneous Emission and Superradiance
... in the form of Fluorescence and Luminescence. The fist theoretical description of spontaneous emission was done by Victor Weisskopf and Eugen Wigner in 1930. They used Dirac’s light-theory and calculated the natural linewidth of atomic crossovers. They have shown, that an excited electronic state is ...
... in the form of Fluorescence and Luminescence. The fist theoretical description of spontaneous emission was done by Victor Weisskopf and Eugen Wigner in 1930. They used Dirac’s light-theory and calculated the natural linewidth of atomic crossovers. They have shown, that an excited electronic state is ...