1,030 research outputs found
General rules for bosonic bunching in multimode interferometers
We perform a comprehensive set of experiments that characterize bosonic
bunching of up to 3 photons in interferometers of up to 16 modes. Our
experiments verify two rules that govern bosonic bunching. The first rule,
obtained recently in [1,2], predicts the average behavior of the bunching
probability and is known as the bosonic birthday paradox. The second rule is
new, and establishes a n!-factor quantum enhancement for the probability that
all n bosons bunch in a single output mode, with respect to the case of
distinguishable bosons. Besides its fundamental importance in phenomena such as
Bose-Einstein condensation, bosonic bunching can be exploited in applications
such as linear optical quantum computing and quantum-enhanced metrology.Comment: 6 pages, 4 figures, and supplementary material (4 pages, 1 figure
Fermonic anyons: entanglement and quantum computation from a resource-theoretic perspective
Often quantum computational models can be understood via the lens of resource
theories, where a computational advantage is achieved by consuming specific
forms of quantum resources and, conversely, resource-free computations are
classically simulable. For example, circuits of nearest-neighbor matchgates can
be mapped to free-fermion dynamics, which can be simulated classically.
Supplementing these circuits with nonmatchgate operations or non-gaussian
fermionic states, respectively, makes them quantum universal. Can we similarly
identify quantum computational resources in the setting of more general
quasi-particle statistics, such as that of fermionic anyons? In this work, we
develop a resource-theoretic framework to define and investigate the
separability of fermionic anyons. We build the notion of separability through a
fractional Jordan-Wigner transformation, leading to a Schmidt decomposition for
fermionic-anyon states. We show that this notion of fermionic-anyon
separability, and the unitary operations that preserve it, can be mapped to the
free resources of matchgate circuits. We also identify how entanglement between
two qubits encoded in a dual-rail manner, as standard for matchgate circuits,
corresponds to the notion of entanglement between fermionic anyons. Though this
does not coincide with the usual definition of qubit entanglement, it provides
new insight into the limited capabilities of matchgate circuits.Comment: 7+19 pages, 3 figure
Indirect tests of the Randall-Sundrum model
I present phenomenological implications of the Randall-Sundrum model for
indirect searches, specifically a selection of flavor observables and
Higgs-related collider searches. I review the interplay of constraints from CP
violation in flavor physics, possible effects in rare decays, and
model-specific protection mechanisms. Deviations in the Higgs couplings to
fermions and, at one-loop, to gluons are unexpectedly strong and lead to strong
modifications in Higgs searches.Comment: 8 pages, 6 figures; Talk given at Discrete '10: Symposium on
Prospects in the Physics of Discrete Symmetries, Rome, Italy, 6-11 Dec 201
Some Myths on FedEx, Home Values
Whenever a new development is opposed by neighboring home owners, one of the opponents’ foremost claims is that the development will reduce residential property values. Sometimes the claims are borne out by the facts, sometimes not
What is the True State of U.S. Furniture Manufacturing?
American furniture manufacturing has taken it on the chin over the last decade. Manufacturing jobs have disappeared as more and more production has moved overseas. Manufacturers that used to have simple organizations now must manage complex global supply chains. And all but a few manufacturers have become manufacturer/importers
The Disappearing Dollar
The dollar is getting weaker. When compared to other currencies such as the euro and the British pound, it’s lost about a quarter of its value over the last two years. In spite of a few minor surges this month, analysts expect the dollar to continue its slide throughout the remainder of 2005. What are the implications of the weakening dollar? Should we care
A Drop in the Bucket: Oil from Arctic Refuge Won’t Yield Much Relief
What a difference a year makes! Last April I wrote a column that explained why gasoline prices had been rising for months. The reason was tight refining capacity in the U.S., combined with the complicated array of gasoline blends that refiners are required by law to produce. Industry experts predicted that prices would moderate within a few months, as summer blends gradually replaced winter blends. And that’s what happened
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