1,991 research outputs found
Independent individual addressing of multiple neutral atom qubits with a MEMS beam steering system
We demonstrate a scalable approach to addressing multiple atomic qubits for
use in quantum information processing. Individually trapped 87Rb atoms in a
linear array are selectively manipulated with a single laser guided by a MEMS
beam steering system. Single qubit oscillations are shown on multiple sites at
frequencies of ~3.5 MHz with negligible crosstalk to neighboring sites.
Switching times between the central atom and its closest neighbor were measured
to be 6-7 us while moving between the central atom and an atom two trap sites
away took 10-14 us.Comment: 9 pages, 3 figure
MEMS-Based Optical Beam Steering System for Quantum Information Processing in 2D Atomic Systems
In order to provide scalability to quantum information processors utilizing
trapped atoms or ions as quantum bits (qubits), the capability to address
multiple individual qubits in a large array is needed. Micro-electromechanical
systems (MEMS) technology can be used to create a flexible and scalable optical
system to direct the necessary laser beams to multiple qubit locations. We
developed beam steering optics using controllable MEMS mirrors that enable one
laser beam to address multiple qubit locations in a 2 dimensional trap lattice.
MEMS mirror settling times of 10 us were demonstrated which allow for fast
access time between qubits.Comment: 7 pages, 4 figure
Multiplexed broadband beam steering system utilizing high speed MEMS mirrors
We present a beam steering system based on micro-electromechanical systems
technology that features high speed steering of multiple laser beams over a
broad wavelength range. By utilizing high speed micromirrors with a broadband
metallic coating, our system has the flexibility to simultaneously incorporate
a wide range of wavelengths and multiple beams. We demonstrate reconfiguration
of two independent beams at different wavelengths (780 and 635 nm) across a
common 5x5 array with 4 us settling time. Full simulation of the optical system
provides insights on the scalability of the system. Such a system can provide a
versatile tool for applications where fast laser multiplexing is necessary.Comment: 11 pages, 6 figures, submitte
Microscopic manipulation of ferroelectric domains in SnSe monolayers at room temperature
Two-dimensional (2D) van der Waals ferroelectrics provide an unprecedented
architectural freedom for the creation of artificial multiferroics and
non-volatile electronic devices based on vertical and co-planar heterojunctions
of 2D ferroic materials. Nevertheless, controlled microscopic manipulation of
ferroelectric domains is still rare in monolayer-thick 2D ferroelectrics with
in-plane polarization. Here we report the discovery of robust ferroelectricity
with a critical temperature close to 400 K in SnSe monolayer plates grown on
graphene, and the demonstration of controlled room temperature ferroelectric
domain manipulation by applying appropriate bias voltage pulses to the tip of a
scanning tunneling microscope (STM). This study shows that STM is a powerful
tool for detecting and manipulating the microscopic domain structures in 2D
ferroelectric monolayers, which is difficult for conventional approaches such
as piezoresponse force microscopy, thus facilitating the hunt for other 2D
ferroelectric monolayers with in-plane polarization with important
technological applications
Search for the Lepton-Number-Violating Decay
A sensitive search for the lepton-number-violating decay has been performed using a sample of hyperons
produced in 800 GeV/ -Cu collisions. We obtain at 90% confidence, improving on the best
previous limit by four orders of magnitude.Comment: 9 pages, 5 figures, to be published in Phys. Rev. Let
Measurement of the Alpha Asymmetry Parameter for the Omega- to Lambda K- Decay
We have measured the alpha parameter of the Omega- to Lambda K- decay using
data collected with the HyperCP spectrometer during the 1997 fixed-target run
at Fermilab. Analyzing a sample of 0.96 million Omega- to Lambda K^-, Lambda to
p pi- decays, we obtain alpha_Omega*alpha_Lambda =
[1.33+/-0.33(stat)+/-0.52(syst)] x 10^{-2}. With the accepted value of
alpha_Lambda, alpha_Omega is found to be [2.07+/-0.51(stat)+/-0.81(syst)] x
10^{-2}.Comment: 5 pages, 4 figures, to be appeared as a Rapid Communication in Phys.
Rev.
Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay
The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has
been measured from a sample of 4.50 million unpolarized Omega-minus decays
recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/-
0.19(stat) +/- 0.16(syst)]{\times}10^{-2}. This is the first unambiguous
evidence for a nonzero alpha decay parameter, and hence parity violation, in
the Omega-minus -> Lambda + K-minus decay.Comment: 10 pages, 7 figure
Evidence for the Decay Sigma+ -> p mu+ mu-
We report the first evidence for the decay Sigma+ -> p mu+ mu- from data
taken by the HyperCP experiment(E871) at Fermilab. Based on three observed
events, the branching ratio is B(Sigma+ -> p,mu+,mu-) = [8.6 +6.6,-5.4(stat)
+/-5.5(syst)] x 10**-8. The narrow range of dimuon masses may indicate that the
decay proceeds via a neutral intermediate state, Sigma+ -> p P0, P0 -> mu+ mu-,
with a P0 mass of 214.3 +/- 0.5 MeV/c**2 and branching ratio B(Sigma+ -> p P0;
P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.Comment: As published in PR
HyperCP: A high-rate spectrometer for the study of charged hyperon and kaon decays
The HyperCP experiment (Fermilab E871) was designed to search for rare
phenomena in the decays of charged strange particles, in particular CP
violation in and hyperon decays with a sensitivity of
. Intense charged secondary beams were produced by 800 GeV/c protons
and momentum-selected by a magnetic channel. Decay products were detected in a
large-acceptance, high-rate magnetic spectrometer using multiwire proportional
chambers, trigger hodoscopes, a hadronic calorimeter, and a muon-detection
system. Nearly identical acceptances and efficiencies for hyperons and
antihyperons decaying within an evacuated volume were achieved by reversing the
polarities of the channel and spectrometer magnets. A high-rate
data-acquisition system enabled 231 billion events to be recorded in twelve
months of data-taking.Comment: 107 pages, 45 Postscript figures, 14 tables, Elsevier LaTeX,
submitted to Nucl. Instrum. Meth.
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