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| Author |
Steudle, Gesine A.; Schietinger, Stefan; Höckel, David; Dorenbos, Sander N.; Zwiller, Valery; Benson, Oliver |
| Title |
Quantum nature of light measured with a single detector |
Type |
Journal Article |
| Year |
2011 |
Publication |
arXiv |
Abbreviated Journal |
arXiv |
| Volume |
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Pages |
7 |
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| Abstract |
We realized the most fundamental quantum optical experiment to prove the non-classical character of light: Only a single quantum emitter and a single superconducting nanowire detector were used. A particular appeal of our experiment is its elegance and simplicity. Yet its results unambiguously enforce a quantum theory for light. Previous experiments relied on more complex setups, such as the Hanbury-Brown-Twiss configuration, where a beam splitter directs light to two photodetectors, giving the false impression that the beam splitter is required. Our work results in a major simplification of the widely used photon-correlation techniques with applications ranging from quantum information processing to single-molecule detection. |
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arXiv:1107.1353 |
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RPLAB @ gujma @ |
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667 |
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Bulaevskii, L. N.; Graf, M. J.; Batista, C. D.; Kogan, V. G. |
| Title |
Vortex-induced dissipation in narrow current-biased thin-film superconducting strips |
Type |
Journal Article |
| Year |
2011 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
83 |
Issue |
14 |
Pages |
9 |
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| Abstract |
A vortex crossing a thin-film superconducting strip from one edge to the other, perpendicular to the bias current, is the dominant mechanism of dissipation for films of thickness d on the order of the coherence length ξ and of width w much narrower than the Pearl length Λâ‰<ab>wâ‰<ab>ξ. At high bias currents I*<I<Ic the heat released by the crossing of a single vortex suffices to create a belt-like normal-state region across the strip, resulting in a detectable voltage pulse. Here Ic is the critical current at which the energy barrier vanishes for a single vortex crossing. The belt forms along the vortex path and causes a transition of the entire strip into the normal state. We estimate I* to be roughly Ic/3. Furthermore, we argue that such “hot†vortex crossings are the origin of dark counts in photon detectors, which operate in the regime of metastable superconductivity at currents between I* and Ic. We estimate the rate of vortex crossings and compare it with recent experimental data for dark counts. For currents below I*, that is, in the stable superconducting but resistive regime, we estimate the amplitude and duration of voltage pulses induced by a single vortex crossing. |
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SSPD |
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RPLAB @ gujma @ |
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688 |
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Mazin, Benjamin A.; Bumble, Bruce; Meeker, Seth R.; O'Brien, Kieran; McHugh, Sean; Langman, Eric |
| Title |
A superconducting focal plane array for ultraviolet, optical, and near-infrared astrophysics |
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Journal Article |
| Year |
2011 |
Publication |
arXiv |
Abbreviated Journal |
arXiv |
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9 |
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Microwave Kinetic Inductance Detectors, or MKIDs, have proven to be a powerful cryogenic detector technology due to their sensitivity and the ease with which they can be multiplexed into large arrays. A MKID is an energy sensor based on a photon-variable superconducting inductance in a lithographed microresonator, and is capable of functioning as a photon detector across the electromagnetic spectrum as well as a particle detector. Here we describe the first successful effort to create a photon-counting, energy-resolving ultraviolet, optical, and near infrared MKID focal plane array. These new Optical Lumped Element (OLE) MKID arrays have significant advantages over semiconductor detectors like charge coupled devices (CCDs). They can count individual photons with essentially no false counts and determine the energy and arrival time of every photon with good quantum efficiency. Their physical pixel size and maximum count rate is well matched with large telescopes. These capabilities enable powerful new astrophysical instruments usable from the ground and space. MKIDs could eventually supplant semiconductor detectors for most astronomical instrumentation, and will be useful for other disciplines such as quantum optics and biological imaging. |
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eprint arXiv:1112.0004 |
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RPLAB @ gujma @ |
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698 |
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Расулова, Г.К.; Брунков, П.Н.; Пентин, И.В.; Ковалюк, В.В.; Горшков, К.Н.; Казаков, А.Ю.; Иванов, С.Ю.; Егоров, А.Ю.; Саксеев, Д.А.; Конников, С.Г. |
| Title |
Взаимная синхронизация двух связанных генераторов автоколебаний на основе сверхрешеток GaAs/AlGaAs |
Type |
Journal Article |
| Year |
2011 |
Publication |
Журнал технической физики |
Abbreviated Journal |
ЖТФ |
| Volume |
81 |
Issue |
6 |
Pages |
80-86 |
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Проведено исследование взаимодействия генераторов автоколебаний на основе 30-периодной слабосвязанной сверхрешетки GaAs/AlGaAs. Воздействие одного генератора автоколебаний на другой осуществлялось при заданном постоянном смещении в отсутствие в одном из них генерации автономных колебаний. Показано, что вынужденные колебания в захватывающем генераторе возникают из-за возбуждения колебаний в системе связанных осцилляторов, образующих границу электрополевого домена на частоте одной из высших гармоник вынуждающего колебания. |
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RPLAB @ gujma @ |
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711 |
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Гольцман, Г. Н.; Разумовская, И. В.; Окунев, О. В; Чулкова, Г. М.; Корнеев, А. А.; Финкель, М. И.; Масленников, С. Н.; Семенов, А. В.; Александров, В. Н. |
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Сборник программ учебных дисциплин профессионального цикла подготовки магистров и бакалавров по направлению «Физика» |
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Journal Article |
| Year |
2011 |
Publication |
Прометей |
Abbreviated Journal |
Прометей |
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Pages |
67 |
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Учебное пособие |
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no |
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RPLAB @ gujma @ |
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717 |
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Antipov, Andrei; Bell, Matt; Yasar, Mesut; Mitin, Vladimir; Scharmach, William; Swihart, Mark; Verevkin, Aleksandr; Sergeev, Andrei |
| Title |
Luminescence of colloidal CdSe/ZnS nanoparticles: high sensitivity to solvent phase transitions |
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Journal Article |
| Year |
2011 |
Publication |
Nanoscale Research Letters |
Abbreviated Journal |
Nan. Res. Lett. |
| Volume |
6 |
Issue |
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Pages |
7 |
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We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. First of all, the luminescence intensity substantially (approximately 50%) increases near the transition. In a large temperature scale, the energy peak of the photoluminescence decreases with temperature due to temperature dependence of the energy gap. Near the melting point, the peak shows N-type dependence with the maximal changes of approximately 30 meV. The line width increases with temperature and also shows N-type dependence near the melting point. The observed effects are associated with the reconstruction of ligands near the ice/water phase transition. |
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RPLAB @ gujma @ |
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722 |
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Belitsky, V.; Desmaris, V.; Dochev, D.; Meledin, D.; Pavolotsky, A. |
| Title |
Towards Multi-Pixel Heterodyne Terahertz Receivers |
Type |
Conference Article |
| Year |
2011 |
Publication |
Proc. 22th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
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Issue |
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Pages |
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Terahertz multi-pixel heterodyne receivers introduce multiple challenges for their implementation, mostly due to the extremely small dimensions of all components and even smaller tolerances in terms of alignment, linear dimensions and waveguide component surface quality. In this manuscript, we present a concept of terahertz multi-pixel heterodyne receiver employing optical layout using polarization split between the LO and RF. The frontend isbased on a waveguide balanced HEB mixer for the frequency band 1.6 – 2.0 THz. The balanced HEB mixer followsthe layout of earlier demonstrated APEX T2 mixer. However for the mixer presented here, we implemented split-block layout offering inimized lengths of all waveguides and thus reducing the associated RF loss. The micromachining methods employed for producing the mixer housing and the HEB mixer chip are very suitable for producing multiple structures and hence are in-line with requirements of multi-pixel receiver technology. The demonstrated relatively simple mounting of the mixer chip with self-aligning should greatly facilitate the integration of such multi-channel receiver. Index Terms—Instrumentation, Multi-pixel, Terahertz, Waveguide Balanced Mixer. |
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no |
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RPLAB @ atomics90 @ |
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975 |
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Shangina, E. L.; Smirnov, K. V.; Morozov, D. V.; Kovalyuk, V. V.; Goltsman, G. N.; Verevkin, A. A.; Toropov, A. I.; Mauskopf, P. |
| Title |
Concentration dependence of energy relaxation time in AlGaAs/GaAs heterojunctions: direct measurements |
Type |
Journal Article |
| Year |
2011 |
Publication |
Semicond. Sci. Technol. |
Abbreviated Journal |
Semicond. Sci. Technol. |
| Volume |
26 |
Issue |
2 |
Pages |
025013 |
| Keywords |
AlGaAs/GaAs heterojunctions |
| Abstract |
We present measurements of the energy relaxation time, τε, of electrons in a single heterojunction in a quasi-equilibrium state using microwave time-resolved spectroscopy at 4.2 K. We find the relaxation time has a power-law dependence on the carrier density of the two-dimensional electron gas, τε∝nγs with γ = 0.40 ± 0.02 for values of the carrier density, ns, from 1.6 × 1011 to 6.6 × 1011cm−2. The results are in good agreement with predictions taking into account the scattering of the carriers by both piezoelectric and deformation potential acoustic phonons. We compare these results with indirect measurements of the energy relaxation time from energy loss measurements involving Joule heating of the electron gas. |
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0268-1242 |
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no |
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1215 |
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Edlmayr, V.; Harzer, T. P.; Hoffmann, R.; Kiener, D.; Scheu, C.; Mitterer, C. |
| Title |
Effects of thermal annealing on the microstructure of sputtered Al2O3 coatings |
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Journal Article |
| Year |
2011 |
Publication |
J. Vac. Sci. Technol. A |
Abbreviated Journal |
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| Volume |
29 |
Issue |
4 |
Pages |
8 |
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Annealing |
| Abstract |
The morphology and microstructure of Al2O3 thin films deposited by pulsed direct current magnetron sputtering were studied in the as-grown state and after vacuum annealing at 1000 °C for 12 h using transmission electron microscopy. For the coating deposited under low ion bombardment conditions, the film consists of small γ- and/or δ-Al2O3 grains embedded in an amorphous matrix. The grain size at the region close to the interface to the substrate was much larger than that of the remaining layer. Growth of the γ-Al2O3 phase is promoted during annealing but no transformation to α-Al2O3 was detected. For high-energetic growth conditions, clear evidence for γ-Al2O3 formation was found in the upper part of the coating with grain size much larger than for low-energetic growth, but the film was predominately amorphous at the interface region. Annealing resulted in the transformation of γ-Al2O3 to α-Al2O3, while the mainly amorphous part crystallized to γ-Al2O3. |
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Annealing |
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no |
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RPLAB @ gujma @ |
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693 |
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Feresten, Nancy Laties; Thornton, Jennifer A.; Emmett, Jennifer; Lamichhane, Priyanka; Epstein, Lori; Kiesow, Annette; Olesin, Kate; Hill, Grace (eds) |
| Title |
Everything: Rocks and Minerals |
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Book Whole |
| Year |
2011 |
Publication |
Nat. Geogr. Partners |
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1-64 |
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children |
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Feresten, Nancy Laties; Thornton, Jennifer A.; Emmett, Jennifer; Lamichhane, Priyanka; Epstein, Lori; Kiesow, Annette; Olesin, Kate; Hill, Grace |
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no |
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1146 |
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Peruzzo, Alberto; Laing, Anthony; Politi, Alberto; Rudolph, Terry; O'Brien, Jeremy L. |
| Title |
Multimode quantum interference of photons in multiport integrated devices |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
2 |
Issue |
224 |
Pages |
6 |
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fromIPMRAS |
| Abstract |
Photonics is a leading approach in realizing future quantum technologies and recently, optical waveguide circuits on silicon chips have demonstrated high levels of miniaturization and performance. Multimode interference (MMI) devices promise a straightforward implementation of compact and robust multiport circuits. Here, we show quantum interference in a 2×2 MMI coupler with visibility of V=95.6+/-0.9%. We further demonstrate the operation of a 4×4 port MMI device with photon pairs, which exhibits complex quantum interference behaviour. We have developed a new technique to fully characterize such multiport devices, which removes the need for phase-sensitive measurements and may find applications for a wide range of photonic devices. Our results show that MMI devices can operate in the quantum regime with high fidelity and promise substantial simplification and concatenation of photonic quantum circuits. |
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RPLAB @ gujma @ |
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763 |
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Ikuta, Rikizo; Kusaka, Yoshiaki; Kitano, suyoshi; Kato, Hiroshi; Yamamoto, Takashi; Koashi, Masato; Imoto, Nobuyuki |
| Title |
Wide-band quantum interface for visible-totelecommunication wavelength conversion |
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Journal Article |
| Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
2 |
Issue |
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Pages |
5 |
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fromIPMRAS |
| Abstract |
Although near-infrared photons in telecommunication bands are required for long-distance quantum communication, various quantum information tasks have been performed by using visible photons for the past two decades. Recently, such visible photons from diverse media including atomic quantum memories have also been studied. Optical frequency down-conversion from visible to telecommunication bands while keeping the quantum states is thus required for bridging such wavelength gaps. Here we report demonstration of a quantum interface of frequency down-conversion from visible to telecommunication bands by using a nonlinear crystal, which has a potential to work over wide bandwidths, leading to a high-speed interface of frequency conversion. We achieved the conversion of a picosecond visible photon at 780 nm to a 1,522-nm photon, and observed that the conversion process retained entanglement between the down-converted photon and another photon. |
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RPLAB @ gujma @ |
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764 |
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Crespi, Andrea; Ramponi, Roberta; Osellame, Roberto; Sansoni, Linda; Bongioanni, Irene; Sciarrino, Fabio; Vallone, Giuseppe; Mataloni, Paolo |
| Title |
Integrated photonic quantum gates for polarization qubits |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
2 |
Issue |
566 |
Pages |
6 |
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fromIPMRAS |
| Abstract |
The ability to manipulate quantum states of light by integrated devices may open new perspectives both for fundamental tests of quantum mechanics and for novel technological applications. However, the technology for handling polarization-encoded qubits, the most commonly adopted approach, is still missing in quantum optical circuits. Here we demonstrate the first integrated photonic controlled-NOT (CNOT) gate for polarization-encoded qubits. This result has been enabled by the integration, based on femtosecond laser waveguide writing, of partially polarizing beam splitters on a glass chip. We characterize the logical truth table of the quantum gate demonstrating its high fidelity to the expected one. In addition, we show the ability of this gate to transform separable states into entangled ones and vice versa. Finally, the full accessibility of our device is exploited to carry out a complete characterization of the CNOT gate through a quantum process tomography. |
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RPLAB @ gujma @ |
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765 |
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Berlín, Guido; Brassard, Gilles; Bussières, Félix; Godbout, Nicolas; Slater, Joshua A.; Tittel, Wolfgang |
| Title |
Experimental loss-tolerant quantum coin flipping |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
2 |
Issue |
561 |
Pages |
7 |
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fromIPMRAS |
| Abstract |
Coin flipping is a cryptographic primitive in which two distrustful parties wish to generate a random bit to choose between two alternatives. This task is impossible to realize when it relies solely on the asynchronous exchange of classical bits: one dishonest player has complete control over the final outcome. It is only when coin flipping is supplemented with quantum communication that this problem can be alleviated, although partial bias remains. Unfortunately, practical systems are subject to loss of quantum data, which allows a cheater to force a bias that is complete or arbitrarily close to complete in all previous protocols and implementations. Here we report on the first experimental demonstration of a quantum coin-flipping protocol for which loss cannot be exploited to cheat better. By eliminating the problem of loss, which is unavoidable in any realistic setting, quantum coin flipping takes a significant step towards real-world applications of quantum communication. |
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RPLAB @ gujma @ |
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766 |
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| Author |
Kono, Junichiro |
| Title |
Coherent terahertz control |
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Journal Article |
| Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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5 |
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5-6 |
| Keywords |
fromIPMRAS |
| Abstract |
Spin and charge terahertz excitations in solids are promising for implementing future technologies such as spintronics and quantum computation, but coherently controlling them has been a significant challenge. Researchers have now manipulated coherent spin waves in an antiferromagnet using the intense magnetic field of ultrashort terahertz pulses. |
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RPLAB @ gujma @ |
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773 |
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