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EPJ Quantum Technology
Scopus
ISSN 2196-0763 · Springer Science+Business Media · 18 artikel di indeks
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Artikel Jurnal Teks lengkap
Commercial applications of quantum computing
Despite the scientific and engineering challenges facing the development of quantum computers, considerable progress is being made toward applying the technology to commercial applications. In this article, we discuss the solutions that some companies are already building using quantum hardware…
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Artikel Jurnal Teks lengkap
AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space
Abstract We propose in this White Paper a concept for a space experiment using cold atoms to search for ultra-light dark matter, and to detect gravitational waves in the frequency range between the most sensitive ranges of LISA and the terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This…
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Artikel Jurnal
Finding critical states of enhanced memory capacity in attractive cold bosons
Abstract We discuss a class of quantum theories which exhibit a sharply increased memory storage capacity due to emergent gapless degrees of freedom. Their realization, both theoretical and experimental, is of great interest. On the one hand, such systems are motivated from a quantum information…
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Quality factor of a transmission line coupled coplanar waveguide resonator
Abstract We investigate analytically the coupling of a coplanar waveguide resonator to a coplanar waveguide feedline. Using a conformal mapping technique we obtain an expression for the characteristic mode impedances and coupling coefficients of an asymmetric multi-conductor transmission line…
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Robust quantum state engineering through coherent localization in biased-coin quantum walks
Abstract We address the performance of a coin-biased quantum walk as a generator for non-classical position states of the walker. We exploit a phenomenon of coherent localization in the position space - resulting from the choice of small values of the coin parameter and assisted by post-selection -…
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Quantum simulation of Rindler transformations
Abstract We show how to implement a Rindler transformation of coordinates with an embedded quantum simulator. A suitable mapping allows to realise the unphysical operation in the simulated dynamics by implementing a quantum gate on an enlarged quantum system. This enhances the versatility of…
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Nanobob: a CubeSat mission concept for quantum communication experiments in an uplink configuration
Abstract We present a ground-to-space quantum key distribution (QKD) mission concept and the accompanying feasibility study for the development of the associated low earth orbit nanosatellite payload. The quantum information is carried by single photons with the binary codes represented by…
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Correction to: a model study of present-day Hall-effect circulators
Abstract Since the publication of the original article [Placke et al. in EPJ Quantum Technol 4:5, 2017], one of the authors noticed a typographical error to equations (11a) and (11b) in their published article [Placke et al. in EPJ Quantum Technol 4:5, 2017]. The correct versions of (11a) and (11b)…
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Artikel Jurnal
Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design
Abstract Satellites are the most efficient way to achieve global scale quantum communication (Q.Com) because unavoidable losses restrict fiber based Q.Com to a few hundred kilometers. We demonstrate the feasibility of establishing a Q.Com uplink with a 3U CubeSat, measuring only 10 × 10 × 34 cm3…
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Quantum communications and quantum metrology in the spacetime of a rotating planet
Abstract We study how quantum systems that propagate in the spacetime of a rotating planet are affected by the curved background. Spacetime curvature affects wavepackets of photons propagating from Earth to a satellite, and the changes in the wavepacket encode the parameters of the spacetime. This…
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Spatial non-adiabatic passage using geometric phases
Abstract Quantum technologies based on adiabatic techniques can be highly effective, but often at the cost of being very slow. Here we introduce a set of experimentally realistic, non-adiabatic protocols for spatial state preparation, which yield the same fidelity as their adiabatic counterparts…
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Artikel Jurnal
JOKARUS - design of a compact optical iodine frequency reference for a sounding rocket mission
Abstract We present the design of a compact absolute optical frequency reference for space applications based on hyperfine transitions in molecular iodine with a targeted fractional frequency instability of better than 3 × 10−14 after 1 s. It is based on a micro-integrated extended cavity diode…
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Characterizing the attenuation of coaxial and rectangular microwave-frequency waveguides at cryogenic temperatures
Abstract Low-loss waveguides are required for quantum communication at distances beyond the chip-scale for any low-temperature solid-state implementation of quantum information processors. We measure and analyze the attenuation constant of commercially available microwave-frequency waveguides down…
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Laser annealing heals radiation damage in avalanche photodiodes
Abstract Avalanche photodiodes (APDs) are a practical option for space-based quantum communications requiring single-photon detection. However, radiation damage to APDs significantly increases their dark count rates and thus reduces their useful lifetimes in orbit. We show that high-power laser…
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CubeSat quantum communications mission
Abstract Quantum communication is a prime space technology application and offers near-term possibilities for long-distance quantum key distribution (QKD) and experimental tests of quantum entanglement. However, there exists considerable developmental risks and subsequent costs and time required to…
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Mitigating radiation damage of single photon detectors for space applications
Abstract Single-photon detectors in space must retain useful performance characteristics despite being bombarded with sub-atomic particles. Mitigating the effects of this space radiation is vital to enabling new space applications which require high-fidelity single-photon detection. To this end, we…
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Artikel Jurnal
A model study of present-day Hall-effect circulators
Abstract Stimulated by the recent implementation of a three-port Hall-effect microwave circulator of Mahoney et al. (MEA), we present model studies of the performance of this device. Our calculations are based on the capacitive-coupling model of Viola and DiVincenzo (VD). Based on conductance data…
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Artikel Jurnal
Nearly optimal measurement schemes in a noisy Mach-Zehnder interferometer with coherent and squeezed vacuum
Abstract The use of an interferometer to perform an ultra-precise parameter estimation under noisy conditions is a challenging task. Here we discuss nearly optimal measurement schemes for a well known, sensitive input state, squeezed vacuum and coherent light. We find that a single mode intensity…