Metric fluctuations and decoherence
... quantum particles and, thus, leads to an apparent violation of the equivalence principle which gave additional motivation to performing improved atom interferometric tests of the equivalence principle. Here we derived another, complementary, implication of such spacetime fluctuations, namely decoher ...
... quantum particles and, thus, leads to an apparent violation of the equivalence principle which gave additional motivation to performing improved atom interferometric tests of the equivalence principle. Here we derived another, complementary, implication of such spacetime fluctuations, namely decoher ...
PDF - Series: APPLIED MATHEMATICS, MECHANICS, and
... which compose its journey duration [9]. With regard to time, in this case the duration of light journey along AB, it will be able to be determined very easily. Indeed, if we call Δt the time of light stop between two joined EVTD2 alternations or, what corresponds primary to the time between two EMW ...
... which compose its journey duration [9]. With regard to time, in this case the duration of light journey along AB, it will be able to be determined very easily. Indeed, if we call Δt the time of light stop between two joined EVTD2 alternations or, what corresponds primary to the time between two EMW ...
Quantum computing with rare-earth-ion doped crystals
... and research facilities after hole-burning. We have already observed reliable one-bit processes, where we use laser light to control the state of the ions, and we have documented the interactions needed for two-bit gates. The qubit requirements in the “Quantum computing on needles in a hay stack” se ...
... and research facilities after hole-burning. We have already observed reliable one-bit processes, where we use laser light to control the state of the ions, and we have documented the interactions needed for two-bit gates. The qubit requirements in the “Quantum computing on needles in a hay stack” se ...
PPT - Institute of Physics, Bhubaneswar
... • If two parties don’t share a reference frame, rotationally invariant states are required to communicate. Bartlett et al., Rev. Mod. Phys. 79, 555 (2007) • If we encode in a DFS, universal quantum computing can be performed on a subspace even though it is not possible on the whole Hilbert space. Ke ...
... • If two parties don’t share a reference frame, rotationally invariant states are required to communicate. Bartlett et al., Rev. Mod. Phys. 79, 555 (2007) • If we encode in a DFS, universal quantum computing can be performed on a subspace even though it is not possible on the whole Hilbert space. Ke ...
The Use and Abuse of “photon” in Nanomechanics – pdf
... where the carets denote that the classical fields are now considered operators. (Note that I have included no term which allows the field to interact with matter – while this certainly makes this Hamiltonian useless from a practical point of view, it suffices to make the points necessary here). The ...
... where the carets denote that the classical fields are now considered operators. (Note that I have included no term which allows the field to interact with matter – while this certainly makes this Hamiltonian useless from a practical point of view, it suffices to make the points necessary here). The ...
2006-11-14-RAL-Wang - Indico
... Implications on the very small as well as the very large As well as causing quantum matter waves to lose coherence at small scales, the conformal gravitational field is responsible for cosmic acceleration linked to inflation and the problem of the cosmological constant. The formula for relating t ...
... Implications on the very small as well as the very large As well as causing quantum matter waves to lose coherence at small scales, the conformal gravitational field is responsible for cosmic acceleration linked to inflation and the problem of the cosmological constant. The formula for relating t ...
Operator Quantum Error Correction.
... Error Correction (OQEC), was recently introduced in [1]. This formalism unifies all of the known techniques for the error correction of quantum operations – i.e. the standard model [2, 3, 4, 5], the method of decoherence-free subspaces [6, 7, 8, 9] and the noiseless subsystem method [10, 11, 12] – u ...
... Error Correction (OQEC), was recently introduced in [1]. This formalism unifies all of the known techniques for the error correction of quantum operations – i.e. the standard model [2, 3, 4, 5], the method of decoherence-free subspaces [6, 7, 8, 9] and the noiseless subsystem method [10, 11, 12] – u ...
Quantum Criticality: competing ground states in low
... macroscopic occupation of 4 He atoms in the ground state. Landau then proceeds to describe the low energy excited states, and hence the finite temperature properties, by identifying elementary excitations which perturb the order of the ground state in a fundamental way. These excitations can be tho ...
... macroscopic occupation of 4 He atoms in the ground state. Landau then proceeds to describe the low energy excited states, and hence the finite temperature properties, by identifying elementary excitations which perturb the order of the ground state in a fundamental way. These excitations can be tho ...
Full text in PDF form
... In this paper, we also consider the issue of causality at the Planck scale in the framework of causal sets, although our results do not promote this aspect as decisively as in [12]. In our opinion, the very concept of causality makes sense in the quasi-classical limit, in relation with the fact that ...
... In this paper, we also consider the issue of causality at the Planck scale in the framework of causal sets, although our results do not promote this aspect as decisively as in [12]. In our opinion, the very concept of causality makes sense in the quasi-classical limit, in relation with the fact that ...
Measuring the quantum mechanical wave function
... pertaining to a pair of random variables from measurements only of individual random variables is quite nice and can be applied to data similarly measured for a stream of quantum particles. These could be atoms emitted from a `hot-oven’ source. You may have guessed already the reason for this strang ...
... pertaining to a pair of random variables from measurements only of individual random variables is quite nice and can be applied to data similarly measured for a stream of quantum particles. These could be atoms emitted from a `hot-oven’ source. You may have guessed already the reason for this strang ...
Arbitrarily Small Amount of Measurement Independence Is Sufficient
... includes the untestable assumption of measurement independence. We have analyzed what happens when this assumption is relaxed and found that, as with Bell locality, it is sufficient to work with a finite number of Bell-like inequalities. Using one such inequality, we showed that the nonlocality of q ...
... includes the untestable assumption of measurement independence. We have analyzed what happens when this assumption is relaxed and found that, as with Bell locality, it is sufficient to work with a finite number of Bell-like inequalities. Using one such inequality, we showed that the nonlocality of q ...
Braid Topologies for Quantum Computation
... now be taken to minimize transitions to noncomputational states, known as leakage errors, when carrying out computations. Figure 2(a) shows elementary braiding operations for three quasiparticles together with the matrices which describe the transitions they induce in the Hilbert space illustrated i ...
... now be taken to minimize transitions to noncomputational states, known as leakage errors, when carrying out computations. Figure 2(a) shows elementary braiding operations for three quasiparticles together with the matrices which describe the transitions they induce in the Hilbert space illustrated i ...
Quantum Wires and Quantum Point Contacts
... and the wafer is cleaved inside the chamber. Cleaving includes scratching the wafer at its edge and subsequently breaking it by mechanical pressure. The GaAs wafer breaks at the scratched position along a single crystal plane. (b) MBE growth is continued on top of this freshly cleaved surface. (c) T ...
... and the wafer is cleaved inside the chamber. Cleaving includes scratching the wafer at its edge and subsequently breaking it by mechanical pressure. The GaAs wafer breaks at the scratched position along a single crystal plane. (b) MBE growth is continued on top of this freshly cleaved surface. (c) T ...
are WAVES. PARTICLES!
... Hidden Variables Copenhagen Interpretation: Interpretation: Quantum Cards Mechanics are notissecretly not complete. shuffledThere in advance. is more information, There isbut no we pre-determination. don’t know it. God does notProbability play gamesiswith all there dice.is. ...
... Hidden Variables Copenhagen Interpretation: Interpretation: Quantum Cards Mechanics are notissecretly not complete. shuffledThere in advance. is more information, There isbut no we pre-determination. don’t know it. God does notProbability play gamesiswith all there dice.is. ...
Quantum computing
Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from digital computers based on transistors. Whereas digital computers require data to be encoded into binary digits (bits), each of which is always in one of two definite states (0 or 1), quantum computation uses quantum bits (qubits), which can be in superpositions of states. A quantum Turing machine is a theoretical model of such a computer, and is also known as the universal quantum computer. Quantum computers share theoretical similarities with non-deterministic and probabilistic computers. The field of quantum computing was initiated by the work of Yuri Manin in 1980, Richard Feynman in 1982, and David Deutsch in 1985. A quantum computer with spins as quantum bits was also formulated for use as a quantum space–time in 1968.As of 2015, the development of actual quantum computers is still in its infancy, but experiments have been carried out in which quantum computational operations were executed on a very small number of quantum bits. Both practical and theoretical research continues, and many national governments and military agencies are funding quantum computing research in an effort to develop quantum computers for civilian, business, trade, and national security purposes, such as cryptanalysis.Large-scale quantum computers will be able to solve certain problems much more quickly than any classical computers that use even the best currently known algorithms, like integer factorization using Shor's algorithm or the simulation of quantum many-body systems. There exist quantum algorithms, such as Simon's algorithm, that run faster than any possible probabilistic classical algorithm.Given sufficient computational resources, however, a classical computer could be made to simulate any quantum algorithm, as quantum computation does not violate the Church–Turing thesis.