Multiple-User Quantum Information Theory for Optical Communication Channels Saikat Guha
... Research in the past decade has established capacity theorems for point-to-point bosonic channels with additive thermal noise, under the presumption of a conjecture on the minimum output von Neumann entropy. In the first part of this thesis, we evaluate the optimum capacity for free-space line-of-si ...
... Research in the past decade has established capacity theorems for point-to-point bosonic channels with additive thermal noise, under the presumption of a conjecture on the minimum output von Neumann entropy. In the first part of this thesis, we evaluate the optimum capacity for free-space line-of-si ...
Correlations and Counting Statistics of an Atom Laser
... enhancement factor (n + 1) and is the underlying principle of laser operation. The formal analogy between light quanta and massive bosons, evident in the formalism of second quantization, suggests the straight forward extension of Glauber’s quantum theory of coherence [40, 41] from optical to matter ...
... enhancement factor (n + 1) and is the underlying principle of laser operation. The formal analogy between light quanta and massive bosons, evident in the formalism of second quantization, suggests the straight forward extension of Glauber’s quantum theory of coherence [40, 41] from optical to matter ...
Emulating Quantum Computation
... infancy of the field has resulted in research covering a huge number of often very specific ideas which are spread across numerous architectures and approaches. Very little of this relates to the simulation or emulation of quantum computation on classical computers. Any development in new techniques ...
... infancy of the field has resulted in research covering a huge number of often very specific ideas which are spread across numerous architectures and approaches. Very little of this relates to the simulation or emulation of quantum computation on classical computers. Any development in new techniques ...
Quantum Measurement and Control
... begin with a discussion of some elementary notions of measurement for classical systems. These are systems that operate at a level where quantum effects are not apparent. The purpose of this discussion is to introduce some ideas, which carry over to quantum theory, concerning states, conditional and ...
... begin with a discussion of some elementary notions of measurement for classical systems. These are systems that operate at a level where quantum effects are not apparent. The purpose of this discussion is to introduce some ideas, which carry over to quantum theory, concerning states, conditional and ...
Entropy - Molecular Diversity Preservation International
... given probability distribution [pi]i, entropy is maximum when all the sent states are orthogonal. I (A : B ) S (%) This inequality is known as the Kholevo (or Holevo) bound, and tells that the average information gain for B in each measurement is bounded by the entropy of the system A. This entrop ...
... given probability distribution [pi]i, entropy is maximum when all the sent states are orthogonal. I (A : B ) S (%) This inequality is known as the Kholevo (or Holevo) bound, and tells that the average information gain for B in each measurement is bounded by the entropy of the system A. This entrop ...
Chapter 12 Laser Cavities and Microcavities: Vertical Cavity Surface
... L m Different values of correspond to different longitudinal modes of the cavity. Since the mirror reflectivities are close to unity, the forward and backward waves must have the same magnitudes and therefore the field amplitude inside the cavity must be proportional to either cos z or ...
... L m Different values of correspond to different longitudinal modes of the cavity. Since the mirror reflectivities are close to unity, the forward and backward waves must have the same magnitudes and therefore the field amplitude inside the cavity must be proportional to either cos z or ...
Cavity Optomechanics in the Quantum Regime
... ing Michelson-type laser interferometers. Gravity waves passing through the Earth would push apart the mirrors in one interferometer arm, while bringing the mirrors in the orthogonal interferometer arm closer together [5], thereby producing a differential phase shift that could be detected on the in ...
... ing Michelson-type laser interferometers. Gravity waves passing through the Earth would push apart the mirrors in one interferometer arm, while bringing the mirrors in the orthogonal interferometer arm closer together [5], thereby producing a differential phase shift that could be detected on the in ...
A high finesse optical resonator for cavity QED experiments
... computer works with qubits, which, as opposed to classical bits with only two defined states, are any coherent superposition of two states. Quantum computing opens a new range of possibilities, especially parallel processing of information. Recently developed quantum algorithms [Shor94] show that qu ...
... computer works with qubits, which, as opposed to classical bits with only two defined states, are any coherent superposition of two states. Quantum computing opens a new range of possibilities, especially parallel processing of information. Recently developed quantum algorithms [Shor94] show that qu ...
Information measures, entanglement and quantum evolution Claudia Zander
... then measure an observable of the copy (in fact, we could perform measurements on as many copies as necessary) without disturbing the original, thereby defeating, for instance, the principle that two non-orthogonal quantum states cannot be distinguished with certainty [23]. Perfect quantum cloning ...
... then measure an observable of the copy (in fact, we could perform measurements on as many copies as necessary) without disturbing the original, thereby defeating, for instance, the principle that two non-orthogonal quantum states cannot be distinguished with certainty [23]. Perfect quantum cloning ...
Multi-particle qubits - Department of Physics — ETH Zurich
... A set of gates is said to be universal if it alone can replicate the effects of all other gates needed for computation. It turns out (a proof can be found in Ref. [1]) that a universal quantum set of gates exists. It is sufficient (for example) to take the set of all single-qubit rotations (SU (2)⊗N ...
... A set of gates is said to be universal if it alone can replicate the effects of all other gates needed for computation. It turns out (a proof can be found in Ref. [1]) that a universal quantum set of gates exists. It is sufficient (for example) to take the set of all single-qubit rotations (SU (2)⊗N ...
Disorder and entropy rate in discrete time quantum walks
... [103], superconducting qubits [104], semiconductor quantum rings [105, 106], array of quantum dots [107], and artificial graphene [108]. For a review on realization schemes, see [109]. In the recent years the number of actual realizations have grown significantly. Quantum walks have been successfull ...
... [103], superconducting qubits [104], semiconductor quantum rings [105, 106], array of quantum dots [107], and artificial graphene [108]. For a review on realization schemes, see [109]. In the recent years the number of actual realizations have grown significantly. Quantum walks have been successfull ...
Exciton-Polariton Bose-Einstein Condensation: Advances and
... Particles in nature can be divided into two categories, depending on their spin: those with integer spins are bosons, and those with half-integer spins are fermions. By contrast to fermions, which cannot simultaneously occupy the same quantum state as a result of the Pauli exclusion principle, boson ...
... Particles in nature can be divided into two categories, depending on their spin: those with integer spins are bosons, and those with half-integer spins are fermions. By contrast to fermions, which cannot simultaneously occupy the same quantum state as a result of the Pauli exclusion principle, boson ...
HBNI Th65 - The Institute of Mathematical Sciences
... studied over the last few decades. But there are other correlations that are motivated from an information-theoretic or measurement perspective, which try to capture this classicalquantum boundary [2]. These include quantum discord, classical correlation, measurement induced disturbance, quantum def ...
... studied over the last few decades. But there are other correlations that are motivated from an information-theoretic or measurement perspective, which try to capture this classicalquantum boundary [2]. These include quantum discord, classical correlation, measurement induced disturbance, quantum def ...
Ph410 Physics of Quantum Computation1
... (reversing) the program once the answer was obtained. The notion that computation could be performed by a reversible process was initially considered to be counterintuitive – and impractical. However, this idea was of great conceptual importance because it opened the door to quantum computation, bas ...
... (reversing) the program once the answer was obtained. The notion that computation could be performed by a reversible process was initially considered to be counterintuitive – and impractical. However, this idea was of great conceptual importance because it opened the door to quantum computation, bas ...
Theory and applications of light-matter interactions in Gerasimos Angelatos
... αn - the polarizability of emitter n Γ - decay rate; Γ0 typically denotes a non-radiative decay rate. Alternatively, imaginary part of complex eigenfrequency ω̃. κ - imaginary part of complex wavevector z dn - dipole moment of emitter n un,k - unit cell function for PC mode with wavevector k and ban ...
... αn - the polarizability of emitter n Γ - decay rate; Γ0 typically denotes a non-radiative decay rate. Alternatively, imaginary part of complex eigenfrequency ω̃. κ - imaginary part of complex wavevector z dn - dipole moment of emitter n un,k - unit cell function for PC mode with wavevector k and ban ...
