Quantum measurement carries information even when
... is called "nonselective." The difference between classical nonselective measurements and quantum nonselective measurements is that the latter cause an inevitable disturbance to the measured system. By tracking this disturbance, the physicists here have shown that it can be used to carry and communic ...
... is called "nonselective." The difference between classical nonselective measurements and quantum nonselective measurements is that the latter cause an inevitable disturbance to the measured system. By tracking this disturbance, the physicists here have shown that it can be used to carry and communic ...
Quantum Computing with Quantum Dots
... lasers. In the absence of excitation and radiation, however, the QD system will fall back in the ground state thus initializing the qubit states. One main obstacle is decoherence, or the effects of uncontrollable coupling with the environment. The decoherence time for an exciton typically ranges fro ...
... lasers. In the absence of excitation and radiation, however, the QD system will fall back in the ground state thus initializing the qubit states. One main obstacle is decoherence, or the effects of uncontrollable coupling with the environment. The decoherence time for an exciton typically ranges fro ...
Loop Quantum Gravity and Effective Matter Theories
... formulated in the pioneering work of T. Jacobson and L. Smolin, it has undergone a rapid increase of original ideas leading to profound insights and unexpected connections between: gravity, loops, knots and gauge theory. After two decades of active research in the field, the LQG approach is by now c ...
... formulated in the pioneering work of T. Jacobson and L. Smolin, it has undergone a rapid increase of original ideas leading to profound insights and unexpected connections between: gravity, loops, knots and gauge theory. After two decades of active research in the field, the LQG approach is by now c ...
Quantum Chaos
... For chaotic systems, the classical phase space distributions develop structures at smaller and smaller scales as time increases ∂3W/∂p3 becomes larger and larger. Even for tiny Planck constant, the corrections will eventually overcome the lowestorder contribution. ...
... For chaotic systems, the classical phase space distributions develop structures at smaller and smaller scales as time increases ∂3W/∂p3 becomes larger and larger. Even for tiny Planck constant, the corrections will eventually overcome the lowestorder contribution. ...
dicke-july2013x
... • We’ve incorporated CoM coordinates into , the “cooperation” operator; does not commute with ! • Thus, these are not stationary eigenstates of . • Classically, relative motion of radiators causes decoherence, but radiators with a common velocity will not decohere. • Quantum mechanically, analogous ...
... • We’ve incorporated CoM coordinates into , the “cooperation” operator; does not commute with ! • Thus, these are not stationary eigenstates of . • Classically, relative motion of radiators causes decoherence, but radiators with a common velocity will not decohere. • Quantum mechanically, analogous ...
The capacity of the noisy quantum channel
... states is called quantum information. The unit of quantum information is the quantum bit, or qubit (pronounced ‘Q-bit’),1 the amount of quantum information that can be registered on a single two-state variable such as a photon’s polarization or a neutron’s spin. This paper puts fundamental limits on ...
... states is called quantum information. The unit of quantum information is the quantum bit, or qubit (pronounced ‘Q-bit’),1 the amount of quantum information that can be registered on a single two-state variable such as a photon’s polarization or a neutron’s spin. This paper puts fundamental limits on ...
Electron interferometry - Fondation Louis de Broglie
... The very short electron avalanches leaving the channel plates (rise time and width ∼.5 ns) are transferred coaxially from the collectors via microwave amplifiers (bandwidth 1.5 GHz) to modified Constant Fraction Trigger (CFT) modules which extract timing signals with low time-jitter and -walk. A fir ...
... The very short electron avalanches leaving the channel plates (rise time and width ∼.5 ns) are transferred coaxially from the collectors via microwave amplifiers (bandwidth 1.5 GHz) to modified Constant Fraction Trigger (CFT) modules which extract timing signals with low time-jitter and -walk. A fir ...
Chern-Simons theory and Weyl quantization
... Here you average the value of the Wilson line over the infinitedimensional space of connections (fields) with oscillatory measure eihL(A)DA where h is Planck’s constant. ...
... Here you average the value of the Wilson line over the infinitedimensional space of connections (fields) with oscillatory measure eihL(A)DA where h is Planck’s constant. ...
Coherent States
... Here I digress from work in progress—namely, a review of a paper by C. Y. She & H. Heffner1 , which was the first of several papers inspired by E. Arthurs & J. L. Kelly’s “On the simultaneous measurement of a pair of conjugate observables” (BSTJ 44, 725 (1965)); it is my intention to incorporate tha ...
... Here I digress from work in progress—namely, a review of a paper by C. Y. She & H. Heffner1 , which was the first of several papers inspired by E. Arthurs & J. L. Kelly’s “On the simultaneous measurement of a pair of conjugate observables” (BSTJ 44, 725 (1965)); it is my intention to incorporate tha ...
PDF
... variety of microscopic physical systems including existing quantum logic devices can swap information from one place to another at rates very close to this limit. The swap picture of quantum information transmission assumes a direct transfer of A ’s qubit to B. A similar picture holds in which A’s a ...
... variety of microscopic physical systems including existing quantum logic devices can swap information from one place to another at rates very close to this limit. The swap picture of quantum information transmission assumes a direct transfer of A ’s qubit to B. A similar picture holds in which A’s a ...
Degeneracy in one-dimensional quantum mechanics
... this reason, this potential is termed the isotonic oscillator [13–18]. In this work, we consider the isotonic oscillator on the whole domain −∞ < x < +∞ as a case study of a one-dimensional quantum system with energy level degeneracy. After a brief review of the isotonic oscillator in Section 2, a d ...
... this reason, this potential is termed the isotonic oscillator [13–18]. In this work, we consider the isotonic oscillator on the whole domain −∞ < x < +∞ as a case study of a one-dimensional quantum system with energy level degeneracy. After a brief review of the isotonic oscillator in Section 2, a d ...
Gentzen-Like Methods in Quantum Logic*
... In that work, he proposed to regard projection operators over a given Hilbert space to represent certain propositions of a corresponding quantum-mechanical system. Later on, in a joint paper with Garrett Birkhoff, this “logic of projection operators” has been given a more elaborated treatment, chara ...
... In that work, he proposed to regard projection operators over a given Hilbert space to represent certain propositions of a corresponding quantum-mechanical system. Later on, in a joint paper with Garrett Birkhoff, this “logic of projection operators” has been given a more elaborated treatment, chara ...
1 Introduction. Measurable and Nonmea
... of the minimal possible measuring unit lmin . So, trying to frame a theory (QT and GR) correct at all the energy levels using only the measurable quantities, one should realize that then the mathematical formalism of the theory should not involve any infinitesimal spatial-temporal quantities. Beside ...
... of the minimal possible measuring unit lmin . So, trying to frame a theory (QT and GR) correct at all the energy levels using only the measurable quantities, one should realize that then the mathematical formalism of the theory should not involve any infinitesimal spatial-temporal quantities. Beside ...
Quantum-information transport to multiple receivers
... schemes where a desired coupling is set up 共usually statically兲 and the system is allowed to evolve until the information transfer has occurred. In such schemes, the receivers may be passive 关5兴, or active 关6兴, but it is usually assumed that neither sender nor receiver can modify the qubit chain, ex ...
... schemes where a desired coupling is set up 共usually statically兲 and the system is allowed to evolve until the information transfer has occurred. In such schemes, the receivers may be passive 关5兴, or active 关6兴, but it is usually assumed that neither sender nor receiver can modify the qubit chain, ex ...