Discrete Approaches to Quantum Gravity in Four Dimensions
... phase structure, and the inclusion of matter, to name just a few. So far, they have not been successful in providing convincing evidence for the existence of a non-trivial four-dimensional quantum theory of gravity (neither, of course, have other methods). There are considerable technical difficulti ...
... phase structure, and the inclusion of matter, to name just a few. So far, they have not been successful in providing convincing evidence for the existence of a non-trivial four-dimensional quantum theory of gravity (neither, of course, have other methods). There are considerable technical difficulti ...
Ground-state properties of sub-Ohmic spin
... quantum phase transition with simultaneous diagonal and off-diagonal coupling is a challenging problem from the theoretical point of view. Recent studies [16] utilized the Davydov D1 variational Ansatz to investigate the quantum phase transition of the spin-boson model in the sub-Ohmic regime with t ...
... quantum phase transition with simultaneous diagonal and off-diagonal coupling is a challenging problem from the theoretical point of view. Recent studies [16] utilized the Davydov D1 variational Ansatz to investigate the quantum phase transition of the spin-boson model in the sub-Ohmic regime with t ...
Strong luminescence quantum-efficiency enhancement near prolate
... dipole emitter as a function of emitter position in a plane through the particle’s major axis for 共a兲 a 60-nm-diameter Ag sphere, and 共b兲 a Ag prolate with an aspect ratio of 2.5 and a volume that is equal to the volume of a 60-nm-diameter sphere. The orientation of the source dipole is taken parall ...
... dipole emitter as a function of emitter position in a plane through the particle’s major axis for 共a兲 a 60-nm-diameter Ag sphere, and 共b兲 a Ag prolate with an aspect ratio of 2.5 and a volume that is equal to the volume of a 60-nm-diameter sphere. The orientation of the source dipole is taken parall ...
Lecture 7: Shor`s Factorisation Algorithm Introduction The Factoring
... • There are several causes of potential error ...
... • There are several causes of potential error ...
Sparse-Graph Codes for Quantum Error-Correction
... written as such a sum because the 4k possible Pauli operators span the space of 2k × 2k complex matrices.) Given such an error and a codeword |ψi, a suitable set of diagnostic operators will ‘pick’ an individual error term Pα̃ |ψi from the sum, and an error correction procedure applied to this term ...
... written as such a sum because the 4k possible Pauli operators span the space of 2k × 2k complex matrices.) Given such an error and a codeword |ψi, a suitable set of diagnostic operators will ‘pick’ an individual error term Pα̃ |ψi from the sum, and an error correction procedure applied to this term ...
Physics meets philosophy at the Planck scale: Contemporary
... common with respect to quantum gravity. It brings together some of the leading thinkers in contemporary physics and philosophy of science to introduce and discuss philosophical issues in the foundations of quantum gravity. In the remainder of this introduction we aim to sketch an outline of the fiel ...
... common with respect to quantum gravity. It brings together some of the leading thinkers in contemporary physics and philosophy of science to introduce and discuss philosophical issues in the foundations of quantum gravity. In the remainder of this introduction we aim to sketch an outline of the fiel ...
Understanding the effects of leakage in superconducting quantum-error-detection circuits hosh, wler, Martinis,
... not leak outside of its computational subspace. For many existing approaches, however, the physical qubits do possess more than two energy levels and consequently are prone to such leakage events. Analyzing the effects of leakage is therefore essential to devise optimal protocols for quantum gates, ...
... not leak outside of its computational subspace. For many existing approaches, however, the physical qubits do possess more than two energy levels and consequently are prone to such leakage events. Analyzing the effects of leakage is therefore essential to devise optimal protocols for quantum gates, ...
Wigner function formalism in Quantum mechanics
... position (q) and momentum (p). There is no uncertainty principle in classical physics, so it is possible to know a particle’s momentum and position at the same time to an arbitrary presicion. In quantum mechanics there is an uncertainty priciple that makes it impossible to know both q or x and p at ...
... position (q) and momentum (p). There is no uncertainty principle in classical physics, so it is possible to know a particle’s momentum and position at the same time to an arbitrary presicion. In quantum mechanics there is an uncertainty priciple that makes it impossible to know both q or x and p at ...
Imaging Electrons in Few-Electron Quantum Dots
... Its been great to stop by and say hi to Tomas Rosado and Matt Toomey in the stockroom, I would like to thank them both for their great work. I am specially grateful for Tomas’s great flan recipe and amazing barbecues. My friends at Harvard have been an invaluable part of my time here. I met Cindy Ha ...
... Its been great to stop by and say hi to Tomas Rosado and Matt Toomey in the stockroom, I would like to thank them both for their great work. I am specially grateful for Tomas’s great flan recipe and amazing barbecues. My friends at Harvard have been an invaluable part of my time here. I met Cindy Ha ...
Finding ordinary objects in some quantum worlds
... H. There is nothing more to the world beyond the facts that constitute the wavefunction and govern its evolution. There is, for example, no further location relation assigning each particle to a point of space at each time.6 If there is any sense in which particles at a H-world can be described as h ...
... H. There is nothing more to the world beyond the facts that constitute the wavefunction and govern its evolution. There is, for example, no further location relation assigning each particle to a point of space at each time.6 If there is any sense in which particles at a H-world can be described as h ...
Continuous Measurement of an Atomic Current
... is written in terms of a Stochastic Schrödinger Equation (SSE) for a wave function |ψc (t)i, where the time evolution of the system is a competition between dynamics induced by the system Hamiltonian and the measurement back-action on the system. Motivated by recent advances in building controlled ...
... is written in terms of a Stochastic Schrödinger Equation (SSE) for a wave function |ψc (t)i, where the time evolution of the system is a competition between dynamics induced by the system Hamiltonian and the measurement back-action on the system. Motivated by recent advances in building controlled ...
Quantum Circuits Engineering: Efficient Simulation and
... menting specific algorithms, we have that knowledge because of the characteristic form these states exhibit. We have performed an analysis concerning the effectiveness of our methodology, for specific states from Shor and Grover algorithms. Unfortunately, as shown by our case study for Shor, Deutsch-Jo ...
... menting specific algorithms, we have that knowledge because of the characteristic form these states exhibit. We have performed an analysis concerning the effectiveness of our methodology, for specific states from Shor and Grover algorithms. Unfortunately, as shown by our case study for Shor, Deutsch-Jo ...
Quantum Information with Fermionic Gaussian States - Max
... In this Thesis we study finite-dimensional fermionic Gaussian states and channels. In physics, Gaussian approximation is a frequently used tool for solving many-body problems. Gaussian approximation relies on describing system fully in terms of two-point correlation functions. This means that all th ...
... In this Thesis we study finite-dimensional fermionic Gaussian states and channels. In physics, Gaussian approximation is a frequently used tool for solving many-body problems. Gaussian approximation relies on describing system fully in terms of two-point correlation functions. This means that all th ...
Chapter 41. One-Dimensional Quantum Mechanics
... of a quantum system should begin to look like the classical solution in the limit that the quantum number becomes very large—that is, as n → ∞. • Because the radius of the Bohr hydrogen atom is r = n2aB, the atom becomes a macroscopic object as n becomes very large. • Bohr’s idea, that the quantum ...
... of a quantum system should begin to look like the classical solution in the limit that the quantum number becomes very large—that is, as n → ∞. • Because the radius of the Bohr hydrogen atom is r = n2aB, the atom becomes a macroscopic object as n becomes very large. • Bohr’s idea, that the quantum ...
Spin Squeezing, Entanglement and Quantum Metrology
... In collective spin systems a separable state is composed of independent elementary spin 1/2 particles. Due to technical limitations the individual elementary spins can not be addressed in many experiments . However it is important to note that the elementary spins have to be in principle distinguish ...
... In collective spin systems a separable state is composed of independent elementary spin 1/2 particles. Due to technical limitations the individual elementary spins can not be addressed in many experiments . However it is important to note that the elementary spins have to be in principle distinguish ...