21 research outputs found
Photon sorters and QND detectors using single photon emitters
We discuss a new method for realizing number-resolving and non-demolition
photo detectors by strong coupling of light to individual single photon
emitters, which act as strong optical non-linearities. As a specific
application we show how these elements can be integrated into an error-proof
Bell state analyzer, whose efficiency exceeds the best possible performance
with linear optics even for a modest atom-field coupling. The methods are
error-proof in the sense that every detection event unambiguously projects the
photon state onto a Fock or Bell state.Comment: revised and enlarged version, 6+ pages, 5 figure
Time reversal symmetry in optics
The utilization of time reversal symmetry in designing and implementing
(quantum) optical experiments has become more and more frequent over the past
years. We review the basic idea underlying time reversal methods, illustrate it
with several examples and discuss a number of implications.Comment: 5 pages, 3 figures, typeset with revte
Aplikasi Macam Pupuk Organik Padat pada Padi Hibrida F2
Padi hibrida merupakan salah satu kunci untuk meningkatkan produksi beras dunia. Namun, benih padi hibrida hanya dapat digunakan untuk satu kali musim tanam, sehingga perlu adanya upaya yang harus dilakukan untuk mempertahankan produksi padi hibrida pada keturunan kedua (F2). Beberapa hal yang dapat dilakukan antara lain adalah dengan pemberian pupuk yang berimbang dan penerapan pengelolaan hara terpadu, salah satunya dengan penggunaan pupuk organik padat. Penelitian dilaksanakan di Desa Joho, Kecamatan Mojolaban, Kabupaten Sukoharjo pada bulan Januari hingga Juni 2016 dengan menggunakan rancangan penelitian Split Plot Rancangan Acak Kelompok Lengkap (RAKL) dengan 2 faktor perlakuan, yaitu macam pupuk organik padat dan varietas padi serta ulangan sebanyak 3 kali. Hasil penelitian menunjukkan bahwa perlakuan macam pupuk organik padat dan varietas padi memberikan pengaruh terhadap semua variabel pengamatan, kecuali pada variabel bobot 1000 butir gabah bernas dan hasil panen per petak
Quantifying the decay of quantum properties in single-mode states
The dissipative dynamics of Gaussian squeezed states (GSS) and coherent
superposition states (CSS) are analytically obtained and compared. Time scales
for sustaining different quantum properties such as squeezing, negativity of
the Wigner function or photon number distribution are calculated. Some of these
characteristic times also depend on initial conditions. For example, in the
particular case of squeezing, we find that while the squeezing of CSS is only
visible for small enough values of the field intensity, in GSS it is
independent of this quantity, which may be experimentally advantageous. The
asymptotic dynamics however is quite similar as revealed by the time evolution
of the fidelity between states of the two classes.Comment: Accepted versio
Generation of a wave packet tailored to efficient free space excitation of a single atom
We demonstrate the generation of an optical dipole wave suitable for the
process of efficiently coupling single quanta of light and matter in free
space. We employ a parabolic mirror for the conversion of a transverse beam
mode to a focused dipole wave and show the required spatial and temporal
shaping of the mode incident onto the mirror. The results include a proof of
principle correction of the parabolic mirror's aberrations. For the application
of exciting an atom with a single photon pulse we demonstrate the creation of a
suitable temporal pulse envelope. We infer coupling strengths of 89% and
success probabilities of up to 87% for the application of exciting a single
atom for the current experimental parameters.Comment: to be published in Europ. Phys. J.
Photon-Atom Coupling with Parabolic Mirrors
Efficient coupling of light to single atomic systems has gained considerable
attention over the past decades. This development is driven by the continuous
growth of quantum technologies. The efficient coupling of light and matter is
an enabling technology for quantum information processing and quantum
communication. And indeed, in recent years much progress has been made in this
direction. But applications aside, the interaction of photons and atoms is a
fundamental physics problem. There are various possibilities for making this
interaction more efficient, among them the apparently 'natural' attempt of
mode-matching the light field to the free-space emission pattern of the atomic
system of interest. Here we will describe the necessary steps of implementing
this mode-matching with the ultimate aim of reaching unit coupling efficiency.
We describe the use of deep parabolic mirrors as the central optical element of
a free-space coupling scheme, covering the preparation of suitable modes of the
field incident onto these mirrors as well as the location of an atom at the
mirror's focus. Furthermore, we establish a robust method for determining the
efficiency of the photon-atom coupling.Comment: Book chapter in compilation "Engineering the Atom-Photon Interaction"
published by Springer in 2015, edited by A. Predojevic and M. W. Mitchell,
ISBN 9783319192307, http://www.springer.com/gp/book/9783319192307. Only
change to version1: now with hyperlinks to arXiv eprints of other book
chapters mentioned in this on
Measuring photon anti-bunching from sideband squeezing with continuous-variable techniques
The CHSH-bell inequality and Tsirelson's bound with postselection
We show the necessary and sufficient conditions on loss for valid CHSH-Bell experiments, and propose an experiment with loss which should violate Tsirelson's bound for entangled states