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Auto- and Cross-Correlation-Functions as entanglement quantifiers in semiconductor microcavities
Auto- Cross-Correlation-Functions entanglement quantifiers semiconductor microcavities
2010/11/11
We characterize the dynamics of the exciton-photon entanglement within semiconductor microcavities using the Wotters concurrence, founding a closed analytical expression for it, using an oversimplifi...
5-qubit quantum error correction in a charge qubit quantum computer
quantum error correction 5-qubit code solid-state quantum register
2010/11/5
We implement the DiVincenzo-Shor 5 qubit quantum error correcting code into a solid-state quantum register. The quantum register is a multi charge-qubit system in a semiconductor environment, where th...
Design and Testing of Superconducting Microwave Passive Components for Quantum Information Processing
Design Testing Superconducting Microwave Passive Components Quantum Information Processing
2010/11/5
We report on the design, fabrication and testing of two superconducting passive microwave components, a quadrature hybrid and a 20 dB directional coupler. These components are designed to be integrate...
Modal quantum theory
Modal quantum theory
2010/11/5
We present a discrete model theory similar in structure to ordinary quantum mechanics, but based on a finite field instead of complex amplitudes. The interpretation of this theory involves only the "m...
Quasi-probability representations of quantum theory with applications to quantum information science
Quasi-probability representations quantum theory applications quantum information science
2010/11/5
This article comprises a review of both the quasi-probability representations of infinite-dimensional quantum theory (including the Wigner function) and the more recently defined quasi-probability rep...
Time-dependent coupled oscillator model for charged particle motion in the presence of a time varyingmagnetic field
charged particle motion unitary transformation
2010/11/4
The dynamics of time-dependent coupled oscillator model for the charged particle motion subjected to a time-dependent external magnetic field is investigated. We used canonical transformation approach...
The Feistel scheme is an important structure in the block ciphers. The security of the Feistel scheme is related to distinguishability with a random permutation. In this paper, efficient quantum algor...
Manipulating quantum information on the controllable systems or subspaces
Manipulating quantum information controllable systems subspaces
2010/10/29
In this paper, we explore how to constructively manipulate quantum information on the controllable systems or subspaces. It is revealed that one can make full use of distinguished properties of Pauli ...
High-energy long-lived resonance of electrons in fractal-like semiconductor heterostructures
High-energy long-lived resonance electrons fractal-like semiconductor heterostructures
2010/11/9
A fractal-like alignment of quantum wells is shown to accommodate resonant states with long lifetimes. For the parameters of the semiconductor heterostructure GaAs/Al$_{0.4}$Ga$_{0.6}$As with the wel...
Explaining the Unobserved: Why Quantum Mechanics Is Not only About Information
Quantum information Collapse theories Crucial experiments Constructive theories
2011/9/8
A remarkable theorem by Clifton, Bub and Halverson (2003) (CBH) characterizes quantum theory in terms of information--theoretic principles. According to Bub (2004, 2005) the philosophical significance...
Avoid First Order Quantum Phase Transition by Changing Problem Hamiltonians
Quantum Phase Transition Changing Problem Hamiltonians
2010/10/29
The problem Hamiltonian of the adiabatic quantum algorithm for the maximum-weight independent set problem (MIS) that is based on the reduction to the Ising problem has flexible parameters. We show tha...
Detection Loophole in Bell experiments: How post-selected local correlations can look non-local
Detection Loophole Bell experiments non-local
2010/10/29
A common problem in Bell type experiments is the well-known detection loophole: if the detection efficiencies are not perfect and if one simply post-selects the conclusive events, one might observe a...
Quantum-like representation algorithm for trichotomous observables
Quantum-like representation algorithm trichotomous observables
2010/10/29
We study the problem of representation of statistical data (of any origin) by a complex probability amplitude. This paper is devoted to representation of data collected from measurements of two tricho...
Extremal Quantum Correlations and Cryptographic Security
Extremal Quantum Correlations Cryptographic Security
2010/10/29
We investigate fundamental properties of device independent security in quantum cryptography and show a one-to-one correspondence between extremal and secure probability distributions. This allows us ...
In a quantum Markov chain, the temporal succession of states is modeled by the repeated action of a ``bistochastic quantum operation" on the density matrix of a quantum system. Based on this conceptua...