13,472 research outputs found
The pointer basis and the feedback stabilization of quantum systems
The dynamics for an open quantum system can be `unravelled' in infinitely
many ways, depending on how the environment is monitored, yielding different
sorts of conditioned states, evolving stochastically. In the case of ideal
monitoring these states are pure, and the set of states for a given monitoring
forms a basis (which is overcomplete in general) for the system. It has been
argued elsewhere [D. Atkins et al., Europhys. Lett. 69, 163 (2005)] that the
`pointer basis' as introduced by Zurek and Paz [Phys. Rev. Lett 70,
1187(1993)], should be identified with the unravelling-induced basis which
decoheres most slowly. Here we show the applicability of this concept of
pointer basis to the problem of state stabilization for quantum systems. In
particular we prove that for linear Gaussian quantum systems, if the feedback
control is assumed to be strong compared to the decoherence of the pointer
basis, then the system can be stabilized in one of the pointer basis states
with a fidelity close to one (the infidelity varies inversely with the control
strength). Moreover, if the aim of the feedback is to maximize the fidelity of
the unconditioned system state with a pure state that is one of its conditioned
states, then the optimal unravelling for stabilizing the system in this way is
that which induces the pointer basis for the conditioned states. We illustrate
these results with a model system: quantum Brownian motion. We show that even
if the feedback control strength is comparable to the decoherence, the optimal
unravelling still induces a basis very close to the pointer basis. However if
the feedback control is weak compared to the decoherence, this is not the case
Valley-kink in Bilayer Graphene at : A Charge Density Signature for Quantum Hall Ferromagnetism
We investigate interaction-induced valley domain walls in bilayer graphene in
the quantum Hall state, subject to a perpendicular electric field that
is antisymmetric across a line in the sample. Such a state can be realized in a
double-gated suspended sample, where the electric field changes sign across a
line in the middle. The non-interacting energy spectrum of the ground state is
characterized by a sharp domain wall between two valley-polarized regions.
Using the Hartree-Fock approximation, we find that the Coulomb interaction
opens a gap between the two lowest-lying states near the Fermi level, yielding
a smooth domain wall with a kink configuration in the valley index. Our results
suggest the possibility to visualize the domain wall via measuring the charge
density difference between the two graphene layers, which we find exhibits a
characteristic pattern. The width of the kink and the resulting pattern can be
tuned by the interplay between the magnetic field and gate electric fields
Coherent chemical kinetics as quantum walks II: Radical-pair reactions in Arabidopsis thaliana
We apply the quantum-walk approach recently proposed in
arXiv:quant-ph-1506.04213 to a radical-pair reaction where realistic estimates
for the intermediate transition rates are available. The well-known average
hitting time from quantum walks can be adopted as a measure of how quickly the
reaction occurs and we calculate this for varying degrees of dephasing in the
radical pair. The time for the radical pair to react to a product is found to
be independent of the amount of dephasing introduced, even in the limit of no
dephasing where the transient population dynamics exhibit strong coherent
oscillations. This can be seen to arise from the existence of a rate-limiting
step in the reaction and we argue that in such examples, a purely classical
model based on rate equations can be used for estimating the timescale of the
reaction but not necessarily its population dynamics
Higgs mass from compositeness at a multi-TeV scale
Within composite Higgs models based on the top seesaw mechanism, we show that
the Higgs field can arise as the pseudo Nambu-Goldstone boson of the broken
U(3)_L chiral symmetry associated with a vector-like quark and the t-b doublet.
As a result, the lightest CP-even neutral state of the composite scalar sector
is lighter than the top quark, and can be identified as the newly discovered
Higgs boson. Constraints on weak isospin violation push the chiral symmetry
breaking scale above a few TeV, implying that other composite scalars are
probably too heavy to be probed at the LHC, but may be within reach at a future
hadron collider with center-of-mass energy of about 100 TeV.Comment: 30 pages. v2: discussion of T parameter expanded; references added.
To be published in JHE
An constructive proof for the Umemura polynomials for the third Painlev\'e equation
We are concerned with the Umemura polynomials associated with the third
Painlev\'e equation. We extend Taneda's method, which was developed for the
Yablonskii--Vorob'ev polynomials associated with the second Painlev\'e
equation, to give an algebraic proof that the rational functions generated by
the nonlinear recurrence relation satisfied by Umemura polynomials are indeed
polynomials. Our proof is constructive and gives information about the roots of
the Umemura polynomials.Comment: 20 pages, 3 figure
Electroweak symmetry breaking by extra dimensions
Electroweak symmetry breaking may be naturally induced by the observed quark
and gauge fields in extra dimensions without a fundamental Higgs field. We show
that a composite Higgs doublet can arise as a bound state of and a
linear combination of the Kaluza-Klein states of , due to QCD in extra
dimensions. The top quark mass depends on the number of active
Kaluza-Klein modes, and is consistent with the experimental value.Comment: 4 pages, LaTeX, talk presented at PASCOS99, Lake Tahoe, Californi
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