40 research outputs found
Population-only decay map for n-qubit n-partite inseparability detection
We introduce a new positive linear map for a single qubit. This map is a
decay only in populations of a single-qubit density operator. It is shown that
an n-fold product of this map may be used for a detection of n-partite
inseparability of an n-qubit density operator (i.e., detection of impossibility
of representing a density operator in the form of a convex combination of
products of density operators of individual qubits). This product map is also
investigated in relation to a variant of the entanglement detection method
mentioned by Laskowski and Zukowski.Comment: 5 pages, 1 figure, RevTex4, v2 minor grammatical changes, typos
correcte
Stripe formation in horizontally oscillating granular suspensions
We present the results of an experimental study of pattern formation in
horizontally oscillating granular suspensions. Starting from a homogeneous
state, the suspension turns into a striped pattern within a specific range of
frequencies and amplitudes of oscillation. We observe an initial development of
layered structures perpendicular to the vibration direction and a gradual
coarsening of the stripes. However, both processes gradually slow down and
eventually saturate. The probability distribution of the stripe width
approaches a nonmonotonic steady-state form which can be approximated by a
Poisson distribution. We observe similar structures in MD simulations of soft
spherical particles coupled to the motion of the surrounding fluid.Comment: 7 pages, 8 figures, to appear in Europhys. Lett. (2014
Single-experiment-detectable multipartite entanglement witness for ensemble quantum computing
In this paper we provide an operational method to detect multipartite
entanglement in ensemble-based quantum computing. This method is based on the
concept of entanglement witness. We decompose the entanglement witness for each
class of multipartite entanglement into nonlocal operations in addition to
local measurements. Individual single qubit measurements are performed
simultaneously, hence complete detection of entanglement is performed in a
single run experiment. This approach is particularly important for experiments
where it is operationally difficult to prepare several copies of an unknown
quantum state and in this sense the introduced scheme in this work is superior
to the generally used entanglement witnesses that require a number of
experiments and preparation of copies of quantum state.Comment: 9 pages, 5 figures, minor changes have been mad
Evaluating measures of nonclassical correlation in a multipartite quantum system
We introduce and compare several measures of nonclassical correlation defined
on the basis of a widely-recognized paradigm claiming that a multipartite
system represented by a density matrix having no product eigenbasis possesses
nonclassical correlation.Comment: 6 pages, 3 figures, submitted to Proc. NIC@QS0
A quantum genetic algorithm with quantum crossover and mutation operations
In the context of evolutionary quantum computing in the literal meaning, a
quantum crossover operation has not been introduced so far. Here, we introduce
a novel quantum genetic algorithm which has a quantum crossover procedure
performing crossovers among all chromosomes in parallel for each generation. A
complexity analysis shows that a quadratic speedup is achieved over its
classical counterpart in the dominant factor of the run time to handle each
generation.Comment: 21 pages, 1 table, v2: typos corrected, minor modifications in
sections 3.5 and 4, v3: minor revision, title changed (original title:
Semiclassical genetic algorithm with quantum crossover and mutation
operations), v4: minor revision, v5: minor grammatical corrections, to appear
in QI
Economical (k,m)-threshold controlled quantum teleportation
We study a (k,m)-threshold controlling scheme for controlled quantum
teleportation. A standard polynomial coding over GF(p) with prime p > m-1 needs
to distribute a d-dimensional qudit with d >= p to each controller for this
purpose. We propose a scheme using m qubits (two-dimensional qudits) for the
controllers' portion, following a discussion on the benefit of a quantum
control in comparison to a classical control of a quantum teleportation.Comment: 11 pages, 2 figures, v2: minor revision, discussions improved, an
equation corrected in procedure (A) of section 4.3, v3: major revision,
protocols extended, citations added, v4: minor grammatical revision, v5:
minor revision, discussions extende
Quantum teleportation with nonclassical correlated states in noninertial frames
Quantum teleportation is studied in noninertial frame, for fermionic case,
when Alice and Bob share a general nonclassical correlated state. In
noninertial frames two fidelities of teleportation are given. It is found that
the average fidelity of teleportation from a separable and nonclassical
correlated state is increasing with the amount of nonclassical correlation of
the state. However, for any particular nonclassical correlated state, the
fidelity of teleportation decreases by increasing the acceleration.Comment: 10 pages, 3 figures, expanded version to appear in Quantum Inf.
Proces
Women and psychological trauma of 9/11 in Amy Waldman’s The Submission
On September 11, 2001, the world was stunned into silence as four hijacked airplanes crashed into two of
America’s iconic landmarks, namely the World Trade Centre and the Pentagon. For the first time, perhaps
since the Vietnam War, the entire United States of America was engulfed in a mutual sense of loss and
inconsolable grief. 2996 people, a vast number of them unarmed civilians including all the passengers aboard
the four hijacked airplanes, lost their lives in what was perceived by many to be the worst terrorist attack of the
twenty-first century. Occurrence of such a colossal tragedy has led to producing a large corpus of textual
representation of the event including countless novels such as Amy Waldman’s The Submission (2012). This
study focuses on analysing The Submission by Amy Waldman using the theory of Psychoanalysis to explore the
concept of psychological trauma and the effects of PTSD (Posttraumatic Stress Disorder) on female characters
affected by the tragedy of 9/11. The analysis, which is mostly based on Wilson and Keane (2004) and Caruth
(2001) psychoanalysis theories, seeks to explore Waldman’s perception of the process of healing from the
devastating tragedy and psychological trauma of the female characters of the story. It is believed that
Waldman’s novel does not only portray the trauma of the characters but also presents the path of recovery and
overcoming the PTSD of those who were emotionally wounded by the tragedy of 9/11