Quantum Objects - Philsci
... state vector. This interpretation, according to Maudlin’s analysis, must overcome the “Three Measurement Problems”: The problem of outcomes. In QM, we encounter with some weird superposition states, which are linear combination of some pure states. The problem associated with these superposition st ...
... state vector. This interpretation, according to Maudlin’s analysis, must overcome the “Three Measurement Problems”: The problem of outcomes. In QM, we encounter with some weird superposition states, which are linear combination of some pure states. The problem associated with these superposition st ...
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... theory appears in the limiting transition. In Section 1 the formalism of the density pro-matrix in QMFL is described in detail. In Section 2 the entropy density matrix on the unit minimum area is introduced for different observers. Then it is used in a detailed study of the information problem of th ...
... theory appears in the limiting transition. In Section 1 the formalism of the density pro-matrix in QMFL is described in detail. In Section 2 the entropy density matrix on the unit minimum area is introduced for different observers. Then it is used in a detailed study of the information problem of th ...
Analysis of a single-atom dipole trap
... Four-level model: For the fluorescence detection of a single atom in our dipole trap we use the MOT cooling laser 共CL兲, red detuned to the unperturbed hyperfine transition 5 2S1/2, F = 2 → 5 2 P3/2, F⬘ = 3 共inset of Fig. 4兲 by ⌬CL = −5⌫ 共⌫ = 2 ⫻ 6 MHz is the natural linewidth兲. To avoid optical pum ...
... Four-level model: For the fluorescence detection of a single atom in our dipole trap we use the MOT cooling laser 共CL兲, red detuned to the unperturbed hyperfine transition 5 2S1/2, F = 2 → 5 2 P3/2, F⬘ = 3 共inset of Fig. 4兲 by ⌬CL = −5⌫ 共⌫ = 2 ⫻ 6 MHz is the natural linewidth兲. To avoid optical pum ...
Coupling Quantum Tunneling with Cavity Photons
... pole moment oriented randomly in the QW plane. The indirect exciton jIX 〉 has the hole in the left QW and the electron in the right QW— thus possessing an additional static dipole moment aligned perpendicularly to the plane—and has a very small overlap of electron and hole wave functions, hence low ...
... pole moment oriented randomly in the QW plane. The indirect exciton jIX 〉 has the hole in the left QW and the electron in the right QW— thus possessing an additional static dipole moment aligned perpendicularly to the plane—and has a very small overlap of electron and hole wave functions, hence low ...
Resource cost results for one-way entanglement
... Entanglement distillation is in some sense a task subaltern to quantum state merging, since entanglement distillation protocols are readily derived from quantum state merging protocols.14 In this task, a given bipartite quantum source has to be transformed into shared maximal entanglement by LOCC in ...
... Entanglement distillation is in some sense a task subaltern to quantum state merging, since entanglement distillation protocols are readily derived from quantum state merging protocols.14 In this task, a given bipartite quantum source has to be transformed into shared maximal entanglement by LOCC in ...
On the Time Evolution of Wavefunctions in Quantum Mechanics 1
... Here we will review the results of the coupled mass problem, Example 1.8.6 from Shankar. This is an example from classical physics which nevertheless demonstrates some of the essential features of coupled degrees of freedom in quantum mechanical problems and a general approach for removing such coup ...
... Here we will review the results of the coupled mass problem, Example 1.8.6 from Shankar. This is an example from classical physics which nevertheless demonstrates some of the essential features of coupled degrees of freedom in quantum mechanical problems and a general approach for removing such coup ...
Adiabatic State Preparation of Interacting Two-Level Systems R. T. Brierley, C. Creatore,
... ensemble of many two level systems. The interaction lifts the degeneracy of the eigenstates of the Hamiltonian, Eq. (1), and causes the level crossings at which state transfer occurs to separate in time. As in the bosonic Josephson junction [36,40–42], the isolation of each degeneracy increases the ...
... ensemble of many two level systems. The interaction lifts the degeneracy of the eigenstates of the Hamiltonian, Eq. (1), and causes the level crossings at which state transfer occurs to separate in time. As in the bosonic Josephson junction [36,40–42], the isolation of each degeneracy increases the ...
Full-Text PDF
... goes to zero (β → ∞), Iτ ≈ 1, its maximum possible value, since we know that the ground state will be the only one to be populated. If, on the other hand, the temperature tends to infinity (β → 0), then Iτ ≈ βh̄ω and tends to zero, because we know beforehand that, in the limit, all energy levels wil ...
... goes to zero (β → ∞), Iτ ≈ 1, its maximum possible value, since we know that the ground state will be the only one to be populated. If, on the other hand, the temperature tends to infinity (β → 0), then Iτ ≈ βh̄ω and tends to zero, because we know beforehand that, in the limit, all energy levels wil ...
douglas c. giancoli
... the flashes would seem random. Indeed, there is no way to predict just where any one electron would hit the screen. If we let the experiment run for a long time, and kept track of where each electron hit the screen, we would soon see a pattern emerging—the interference pattern predicted by the wave ...
... the flashes would seem random. Indeed, there is no way to predict just where any one electron would hit the screen. If we let the experiment run for a long time, and kept track of where each electron hit the screen, we would soon see a pattern emerging—the interference pattern predicted by the wave ...
Exciton Fine-Structure Splitting in Self- Assembled Lateral InAs/GaAs Quantum-Dot Molecular Structures
... shape-induced asymmetry is taken into account. Our experimental results show an opposite correlation in the DQDs, namely, the lower-lying bright exciton state is in fact polarized along the [11̅0] axis that is perpendicular to the elongation axis (i.e [110]) of each of the two QDs constituting the D ...
... shape-induced asymmetry is taken into account. Our experimental results show an opposite correlation in the DQDs, namely, the lower-lying bright exciton state is in fact polarized along the [11̅0] axis that is perpendicular to the elongation axis (i.e [110]) of each of the two QDs constituting the D ...
Quantum key distribution
Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.