Records |
Author |
Kosako, Terukazu; Kadoya, Yutaka; Hofmann, Holger F. |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Directional control of light by a nano-optical Yagi–Uda antenna |
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Journal Article |
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2010 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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4 |
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312 - 315 |
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optical antennas |
Abstract |
The plasmon resonance of metal nanoparticles can direct light from optical emitters in much the same way that radiofrequency antennas direct the emission from electrical circuits. Recently, rapid progress has been made in the realization of single-element antennas for optical waves. Because most of these devices are designed to optimize the local near-field coupling between the antenna and an emitter, the possibility of modifying the spatial radiation pattern has not yet received as much attention. In the radiofrequency regime, a typical antenna design for high directivity is the Yagi–Uda antenna, which essentially consists of a one-dimensional array of antenna elements driven by a single feed element. By fabricating a corresponding array of nanoparticles, similar radiation patterns can be obtained in the optical regime. Here, we present the experimental demonstration of directional control of radiation from a nano-optical Yagi–Uda antenna composed of appropriately tuned gold nanorods. |
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RPLAB @ gujma @ |
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747 |
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Nevou, L.; Liverini, V.; Friedli, P.; Castellano, F.; Bismuto, A.; Sigg, H.; Gramm, F.; Müller, E.; Faist, J. |
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Current quantization in an optically driven electron pump based on self-assembled quantum dots |
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Journal Article |
Year |
2011 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
Issue |
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Pages |
423–427 |
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fromIPMRAS |
Abstract |
The electronic structure of self-assembled semiconductor quantum dots consists of discrete atom-like states that can be populated with a well-defined number of electrons. This property can be used to fabricate a d.c. current standard that enables the unit of ampere to be independently defined. Here we report an optically pumped current source based on self-assembled InAs/GaAs quantum dots. The accuracy obtained so far is 10–1 and is limited by the uncertainty in the number of dots. At 10 K the device generates a current difference of 2.39 nA at a frequency of 1 kHz. The accuracy could be improved by site-selective growth techniques where the number of dots is fixed by pre-patterning. The results are promising for applications in electrical metrology, where a current standard is needed to close the so-called quantum metrological triangle. |
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RPLAB @ gujma @ |
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841 |
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Pirandola, Stefano; Mancini, Stefano; Lloyd, Seth; Braunstein, Samuel L. |
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Continuous-variable quantum cryptography using two-way quantum communication |
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Journal Article |
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2008 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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4 |
Issue |
9 |
Pages |
726-730 |
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fromIPMRAS |
Abstract |
Quantum cryptography has recently been extended to continuous-variable systems, such as the bosonic modes of the electromagnetic field possessing continuous degrees of freedom. In particular, several cryptographic protocols have been proposed and experimentally implemented using bosonic modes with Gaussian statistics. These protocols have shown the possibility of reaching very high secret key rates, even in the presence of strong losses in the quantum communication channel. Despite this robustness to loss, their security can be affected by more general attacks where extra Gaussian noise is introduced by the eavesdropper. Here, we show a `hardware solution' for enhancing the security thresholds of these protocols. This is possible by extending them to two-way quantum communication where subsequent uses of the quantum channel are suitably combined. In the resulting two-way schemes, one of the honest parties assists the secret encoding of the other, with the chance of a non-trivial superadditive enhancement of the security thresholds. These results should enable the extension of quantum cryptography to more complex quantum communications. |
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RPLAB @ gujma @ |
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798 |
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Smith, Devin H.; Gillett, Geoff; de Almeida, Marcelo P.; Branciard, Cyril; Fedrizzi, Alessandro; Weinhold, Till J.; Lita, Adriana; Calkins, Brice; Gerrits, Thomas; Wiseman, Howard M.; Nam, Sae Woo; White, Andrew G. |
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Conclusive quantum steering with superconducting transition-edge sensors |
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Journal Article |
Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
3 |
Issue |
625 |
Pages |
6 |
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fromIPMRAS |
Abstract |
Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test. |
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RPLAB @ gujma @ |
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768 |
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Kono, Junichiro |
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Coherent terahertz control |
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Journal Article |
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2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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5 |
Issue |
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Pages |
5-6 |
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fromIPMRAS |
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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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Grotz, Bernhard; Hauf, Moritz V.; Dankerl, Markus; Naydenov, Boris; Pezzagna, Sébastien; Meijer, Jan; Jelezko, Fedor; Wrachtrup, Jörg; Stutzmann, Martin; Reinhard, Friedemann; Garrido, Jose A. |
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Charge state manipulation of qubits in diamond |
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Journal Article |
Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
3 |
Issue |
729 |
Pages |
6 |
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fromIPMRAS |
Abstract |
The nitrogen-vacancy (NV) centre in diamond is a promising candidate for a solid-state qubit. However, its charge state is known to be unstable, discharging from the qubit state NV- into the neutral state NV0 under various circumstances. Here we demonstrate that the charge state can be controlled by an electrolytic gate electrode. This way, single centres can be switched from an unknown non-fluorescent state into the neutral charge state NV0, and the population of an ensemble of centres can be shifted from NV0 to NV-. Numerical simulations confirm the manipulation of the charge state to be induced by the gate-controlled shift of the Fermi level at the diamond surface. This result opens the way to a dynamic control of transitions between charge states and to explore hitherto inaccessible states, such as NV+. |
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RPLAB @ gujma @ |
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770 |
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Ulhaq, A.; Weiler, S.; Ulrich, S. M.; Roßbach, R.; Jetter, M.; Michler, P. |
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Cascaded single-photon emission from the Mollow triplet sidebands of a quantum dot |
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Journal Article |
Year |
2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
4 |
Pages |
238-242 |
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fromIPMRAS |
Abstract |
Emission from a resonantly excited quantum emitter is a fascinating research topic within the field of quantum optics and is a useful source for different types of quantum light fields. The resonance spectrum consists of a single spectral line that develops into a triplet above saturation of the quantum emitter. The three closely spaced photon channels from the resonance fluorescence have different photon statistical signatures. We present a detailed photon statistics analysis of the resonance fluorescence emission triplet from a solid-state-based artificial atom, that is, a semiconductor quantum dot. The photon correlation measurements demonstrate both `single' and `cascaded' photon emission from the Mollow triplet sidebands. The bright and narrow sideband emission (5.9 × 106 photons per second into the first lens) can be conveniently frequency-tuned by laser detuning over 15 times its linewidth (Δv ~ 1.0 GHz). These unique properties make the Mollow triplet sideband emission a valuable light source for quantum light spectroscopy and quantum information applications, for example. |
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RPLAB @ gujma @ |
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788 |
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Buchanan, Mark |
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Body of evidence |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
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RPLAB @ gujma @ |
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837 |
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Goulielmakis, Eleftherios |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Attosecond photonics: Extreme ultraviolet catastrophes |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
Volume |
6 |
Issue |
3 |
Pages |
142-143 |
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fromIPMRAS |
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Extreme ultraviolet attosecond pulses, which emerge from the interaction of atoms with intense laser fields, play a central role in modern ultrafast science and the exploration of electron behaviour. Recent work now shows that catastrophe theory can help optimize the properties of these pulses. |
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RPLAB @ gujma @ |
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791 |
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Taylor, F.W. |
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Atmospheric physics: Natural lasers on Venus and Mars |
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1983 |
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Nature |
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Nature |
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306 |
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5944 |
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640-640 |
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0028-0836 |
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457 |
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Bozyigit, D.; Lang, C.; Steffen, L.; Fink, J. M.; Eichler, C.; Baur, M.; Bianchetti, R.; Leek, P. J.; Filipp, S.; da Silva, M. P.; Blais, A.; Wallraff, A. |
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Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors |
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Journal Article |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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2 |
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154-158 |
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fromIPMRAS |
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At optical frequencies the radiation produced by a source, such as a laser, a black body or a single-photon emitter, is frequently characterized by analysing the temporal correlations of emitted photons using single-photon counters. At microwave frequencies, however, there are no efficient single-photon counters yet. Instead, well-developed linear amplifiers allow for efficient measurement of the amplitude of an electromagnetic field. Here, we demonstrate first- and second-order correlation function measurements of a pulsed microwave-frequency single-photon source integrated on the same chip with a 50/50 beam splitter followed by linear amplifiers and quadrature amplitude detectors. We clearly observe single-photon coherence in first-order and photon antibunching in second-order correlation function measurements of the propagating fields. |
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RPLAB @ gujma @ |
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835 |
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Novotny, Lukas; van Hulst, Niek |
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Antennas for light |
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Journal Article |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
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2 |
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83-90 |
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optical antennas |
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Optical antennas are devices that convert freely propagating optical radiation into localized energy, and vice versa. They enable the control and manipulation of optical fields at the nanometre scale, and hold promise for enhancing the performance and efficiency of photodetection, light emission and sensing. Although many of the properties and parameters of optical antennas are similar to their radiowave and microwave counterparts, they have important differences resulting from their small size and the resonant properties of metal nanostructures. This Review summarizes the physical properties of optical antennas, provides a summary of some of the most important recent developments in the field, discusses the potential applications and identifies the future challenges and opportunities. |
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RPLAB @ gujma @ |
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748 |
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Kawano, Yukio; Ishibashi, Koji |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
An on-chip near-field terahertz probe and detector |
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2008 |
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Nature Photonics |
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Nature Photon |
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2 |
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10 |
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618-621 |
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single molecule, terahertz, THz, near-field, microscopy, imaging, 2DEG, GaAs/AlGaAs, detector, applications |
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The advantageous properties of terahertz waves, such as their transmission through objects opaque to visible light, are attracting attention for imaging applications. A promising approach for achieving high spatial resolution is the use of near-field imaging. Although this method has been well established in the visible and microwave regions, it is challenging to perform in the terahertz region. In the terahertz techniques investigated to date, detectors have been located remotely from the probe, which degrades sensitivity, and the influence of far-field waves is unavoidable. Here we present a new integrated detection device for terahertz near-field imaging in which all the necessary detection components — an aperture, a probe and a terahertz detector — are integrated on one semiconductor chip, which is cryogenically cooled. This scheme allows highly sensitive, high-resolution detection of the evanescent field alone and promises new capabilities for high-resolution terahertz imaging. |
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1749-4885 |
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570 |
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Arcizet, O.; Jacques, V.; Siria, A.; Poncharal, P.; Vincent, P.; Seidelin, S. |
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A single nitrogen-vacancy defect coupled to a nanomechanical oscillator |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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11 |
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879-883 |
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fromIPMRAS |
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We position a single nitrogen-vacancy (NV) centre hosted in a diamond nanocrystal at the extremity of a SiC nanowire. This novel hybrid system couples the degrees of freedom of two radically different systems: a nanomechanical oscillator and a single quantum object. We probe the dynamics of the nano-resonator through time-resolved nanocrystal fluorescence and photon-correlation measurements, conveying the influence of a mechanical degree of freedom on a non-classical photon emitter. Moreover, by immersing the system in a strong magnetic field gradient, we induce a magnetic coupling between the nanomechanical oscillator and the NV electronic spin, providing nanomotion readout through a single electronic spin. Spin-dependent forces inherent to this coupling scheme are essential in a variety of active cooling and entanglement protocols used in atomic physics, and should now be within the reach of nanomechanical hybrid systems. |
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RPLAB @ gujma @ |
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819 |
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Biercuk, Michael J. |
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A quantum spectrum analyser |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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525–526 |
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Noise filters based on so-called dynamical decoupling pulse sequences can suppress decoherence in quantum systems. Turning this idea on its head now provides a new technique for studying the noise itself. |
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RPLAB @ gujma @ |
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826 |
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