7,349 research outputs found
Weak values in a classical theory with an epistemic restriction
Weak measurement of a quantum system followed by postselection based on a
subsequent strong measurement gives rise to a quantity called the weak value: a
complex number for which the interpretation has long been debated. We analyse
the procedure of weak measurement and postselection, and the interpretation of
the associated weak value, using a theory of classical mechanics supplemented
by an epistemic restriction that is known to be operationally equivalent to a
subtheory of quantum mechanics. Both the real and imaginary components of the
weak value appear as phase space displacements in the postselected expectation
values of the measurement device's position and momentum distributions, and we
recover the same displacements as in the quantum case by studying the
corresponding evolution in the classical theory. By using this analogous
classical theory, we gain insight into the appearance of the weak value as a
result of the statistical effects of post selection, and this provides us with
an operational interpretation of the weak value, both its real and imaginary
parts. We find that the imaginary part of the weak value is a measure of how
much postselection biases the mean phase space distribution for a given amount
of measurement disturbance. All such biases proportional to the imaginary part
of the weak value vanish in the limit where disturbance due to measurement goes
to zero. Our analysis also offers intuitive insight into how measurement
disturbance can be minimised and the limits of weak measurement.Comment: 9 pages, 2 figures, comments welcome; v2 added some references; v3
published versio
Coastal oceanography and sedimentology in New Zealand, 1967-91.
This paper reviews research that has taken place on physical oceanography and sedimentology on New Zealand's estuaries and the inner shelf since c. 1967. It includes estuarine sedimentation, tidal inlets, beach morphodynamics, nearshore and inner shelf sedimentation, tides and coastal currents, numerical modelling, short-period waves, tsunamis, and storm surges. An extensive reference list covering both published and unpublished material is included. Formal teaching and research programmes dealing with coastal landforms and the processes that shape them were only introduced to New Zealand universities in 1964; the history of the New Zealand Journal of Marine and Freshwater Research parallels and chronicles the development of physical coastal science in New Zealand, most of which has been accomplished in last 25 years
Adjustment to a low-control situation: Reexamining the role of coping responses
The aim of the study was to test a revised conceptualization of the role of coping in adjustment to a low-control stressor-women's adjustment to a failed in vitro fertilization (NF) attempt. Data were collected prior to the IVF treatment (Time I) and twice after the failed NF attempt (1 to 2 weeks after finding out the results, n = 171, and fi weeks later, n = 139). Initial adjustment was assessed at Time I, whereas measures of coping and both self-report and partner ratings of adjustment were obtained at Times ? and 3. As predicted, escapist strategies and problem-management strategies (mainly at Time ?) were associated with poor adjustment, whereas problem-appraisal coping was associated with better adjustment., There was also support for the proposed positive relationship between adjustment and emotional approach coping (on self-report adjustment)
Dividing population genetic distance data with the software Partitioning Optimization with Restricted Growth Strings (PORGS): an application for Chinook salmon (Oncorhynchus tshawytscha), Vancouver Island, British Columbia
A new method of finding the optimal group membership and number of groupings to partition population genetic distance data is presented. The software program Partitioning Optimization with Restricted Growth Strings (PORGS), visits all possible set partitions and deems
acceptable partitions to be those that reduce mean intracluster distance. The optimal number of groups is determined with the gap statistic which compares PORGS results with a reference distribution. The PORGS method was validated by a simulated data set with a known distribution.
For efficiency, where values of n were larger, restricted growth strings (RGS) were used to bipartition populations during a nested search (bi-PORGS). Bi-PORGS was applied to a set of genetic data from 18 Chinook salmon (Oncorhynchus
tshawytscha) populations from the west coast of Vancouver Island. The optimal grouping of these populations
corresponded to four geographic locations: 1) Quatsino Sound, 2) Nootka Sound, 3) Clayoquot +Barkley sounds,
and 4) southwest Vancouver Island. However, assignment of populations to groups did not strictly reflect the geographical divisions; fish of Barkley Sound origin that had strayed into the Gold River and close genetic similarity
between transferred and donor populations meant groupings crossed geographic boundaries. Overall, stock structure determined by this partitioning method was similar to that
determined by the unweighted pair-group method with arithmetic averages (UPGMA), an agglomerative clustering algorithm
Can a Lattice String Have a Vanishing Cosmological Constant?
We prove that a class of one-loop partition functions found by Dienes, giving
rise to a vanishing cosmological constant to one-loop, cannot be realized by a
consistent lattice string. The construction of non-supersymmetric string with a
vanishing cosmological constant therefore remains as elusive as ever. We also
discuss a new test that any one-loop partition function for a lattice string
must satisfy.Comment: 14 page
High-frequency performance of Schottky source/drain silicon pMOS devices
A radio-frequency performance of 85-nm gate-length p-type Schottky barrier (SB) with PtSi source/drain materials is investigated. The impact of silicidation annealing temperature on the high-frequency behavior of SB MOSFETs is analyzed using an extrinsic small-signal equivalent circuit. It is demonstrated that the current drive and the gate transconductance strongly depend on the silicidation anneal temperature, whereas the unity-gain cutoff frequency of the measured devices remains nearly unchanged
Duration judgements in patients with schizophrenia
Background. The ability to encode time cues underlies many cognitive processes. In the light of schizophrenic patients' compromised cognitive abilities in a variety of domains, it is noteworthy that there are numerous reports of these patients displaying impaired timing abilities. However, the timing intervals that patients have been evaluated on in prior studies vary considerably in magnitude (e.g. 1 s, 1 min, 1 h etc.).
Method. In order to obviate differences in abilities in chronometric counting and place minimal demands on cognitive processing, we chose tasks that involve making judgements about brief durations of time (<1 s).
Results. On a temporal generalization task, patients were less accurate than controls at recognizing a standard duration. The performance of patients was also significantly different from controls on a temporal bisection task, in which participants categorized durations as short or long. Although time estimation may be closely intertwined with working memory, patients' working memory as measured by the digit span task did not correlate significantly with their performance on the duration judgement tasks. Moreover, lowered intelligence scores could not completely account for the findings.
Conclusions. We take these results to suggest that patients with schizophrenia are less accurate at estimating brief time periods. These deficits may reflect dysfunction of biopsychological timing processes
Quantum communication using a bounded-size quantum reference frame
Typical quantum communication schemes are such that to achieve perfect
decoding the receiver must share a reference frame with the sender. Indeed, if
the receiver only possesses a bounded-size quantum token of the sender's
reference frame, then the decoding is imperfect, and we can describe this
effect as a noisy quantum channel. We seek here to characterize the performance
of such schemes, or equivalently, to determine the effective decoherence
induced by having a bounded-size reference frame. We assume that the token is
prepared in a special state that has particularly nice group-theoretic
properties and that is near-optimal for transmitting information about the
sender's frame. We present a decoding operation, which can be proven to be
near-optimal in this case, and we demonstrate that there are two distinct ways
of implementing it (corresponding to two distinct Kraus decompositions). In
one, the receiver measures the orientation of the reference frame token and
reorients the system appropriately. In the other, the receiver extracts the
encoded information from the virtual subsystems that describe the relational
degrees of freedom of the system and token. Finally, we provide explicit
characterizations of these decoding schemes when the system is a single qubit
and for three standard kinds of reference frame: a phase reference, a Cartesian
frame (representing an orthogonal triad of spatial directions), and a reference
direction (representing a single spatial direction).Comment: 17 pages, 1 figure, comments welcome; v2 published versio
Almost Commuting Matrices, Localized Wannier Functions, and the Quantum Hall Effect
For models of non-interacting fermions moving within sites arranged on a
surface in three dimensional space, there can be obstructions to finding
localized Wannier functions. We show that such obstructions are -theoretic
obstructions to approximating almost commuting, complex-valued matrices by
commuting matrices, and we demonstrate numerically the presence of this
obstruction for a lattice model of the quantum Hall effect in a spherical
geometry. The numerical calculation of the obstruction is straightforward, and
does not require translational invariance or introducing a flux torus.
We further show that there is a index obstruction to approximating
almost commuting self-dual matrices by exactly commuting self-dual matrices,
and present additional conjectures regarding the approximation of almost
commuting real and self-dual matrices by exactly commuting real and self-dual
matrices. The motivation for considering this problem is the case of physical
systems with additional antiunitary symmetries such as time reversal or
particle-hole conjugation.
Finally, in the case of the sphere--mathematically speaking three almost
commuting Hermitians whose sum of square is near the identity--we give the
first quantitative result showing this index is the only obstruction to finding
commuting approximations. We review the known non-quantitative results for the
torus.Comment: 35 pages, 2 figure
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