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Author |
Fazal, Furqan M.; Block, Steven M. |
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Title |
Optical tweezers study life under tension |
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Journal Article |
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Year |
2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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5 |
Issue |
6 |
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318-321 |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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RPLAB @ gujma @ |
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776 |
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Author |
Gabay, Marc; Triscone, Jean-Marc |
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Title |
Superconductors: Terahertz superconducting switch |
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Journal Article |
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Year |
2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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Volume |
5 |
Issue |
8 |
Pages |
447-449 |
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fromIPMRAS |
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The use of terahertz pulses to 'gate' interlayer charge transport in a superconductor could lead to a variety of new and interesting applications. |
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RPLAB @ gujma @ |
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777 |
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Author |
Capmany, José; Gasulla, Ivana; Sales, Salvador |
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Title |
Microwave photonics: Harnessing slow light |
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Journal Article |
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Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
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Volume |
5 |
Issue |
12 |
Pages |
731-733 |
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Slow-light techniques originally conceived for buffering high-speed digital optical signals now look set to play an important role in providing broadband phase and true time delays for microwave signals. |
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778 |
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Zhu, J.; Christensen, J.; Jung, J.; Martin-Moreno, L.; Yin, X.; Fok, L.; Zhang, X.; Garcia-Vidal, F. J. |
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A holey-structured metamaterial for acoustic deep-subwavelength imaging |
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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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1 |
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52-55 |
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For classical waves such as light or sound, diffraction sets a natural limit on how finely the details of an object can be recorded on its image. Recently, various optical superlenses based on the metamaterials concept have shown the possibility of overcoming the diffraction limit. Similar two-dimensional (2D) acoustic hyperlens designs have also been explored. Here we demonstrate a 3D holey-structured metamaterial that achieves acoustic imaging down to a feature size of λ/50. The evanescent field components of a subwavelength object are efficiently transmitted through the structure as a result of their strong coupling with Fabry-Pérot resonances inside the holey plate. This capability of acoustic imaging at a very deep-subwavelength scale may open the door for a broad range of applications, including medical ultrasonography, underwater sonar and ultrasonic non-destructive evaluation. |
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RPLAB @ gujma @ |
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809 |
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Author |
Barreiro, Julio T. |
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Quantum physics: Environmental effects controlled |
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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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927–928 |
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An open quantum system loses its 'quantumness' when information about the state leaks into its surroundings. Researchers now show how this decoherence can be controlled between two incompatible regimes in the case of a single photon. |
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RPLAB @ gujma @ |
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817 |
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Author |
Hannay, Timo |
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Title |
A new kind of science? |
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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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Volume |
7 |
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Pages |
742 |
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RPLAB @ gujma @ |
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818 |
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Author |
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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Journal Article |
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2011 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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Volume |
7 |
Issue |
11 |
Pages |
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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Author |
Billangeon, P.-M.; Nakamura, Y. |
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Superconducting devices: Quantum cups and balls |
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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 |
Issue |
8 |
Pages |
594-595 |
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A single microwave photon in a superposition of two states of different frequency is now demonstrated using a superconducting quantum interference device to mediate the coupling between two harmonics of a resonator. Such quantum circuits bring closer the possibility of controlling photon-photon interactions at the single-photon level. |
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RPLAB @ gujma @ |
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820 |
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Prevedel, Robert; Hamel, Deny R.; Colbeck, Roger; Fisher, Kent; Resch, Kevin J. |
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Experimental investigation of the uncertainty principle in the presence of quantum memory and its application to witnessing entanglement |
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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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10 |
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757-761 |
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fromIPMRAS |
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Heisenberg's uncertainty principle provides a fundamental limitation on the ability of an observer holding classical information to predict the outcome when one of two measurements is performed on a quantum system. However, an observer with access to a particle (stored in a quantum memory) which is entangled with the system generally has a reduced uncertainty: indeed, if the particle and system are maximally entangled, the observer can perfectly predict the outcome of whichever measurement is chosen. This effect has recently been quantified in a new entropic uncertainty relation. Here we experimentally investigate this relation, showing its effectiveness as an efficient entanglement witness. We use entangled photon pairs, an optical delay line serving as a simple quantum memory and fast, active feed-forward. Our results quantitatively agree with the new uncertainty relation. Our technique acts as a witness for almost all entangled states in our experiment as we obtain lower uncertainties than would be possible without the entangled particle. |
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RPLAB @ gujma @ |
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821 |
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Zakka-Bajjani, Eva; Nguyen, François; Lee, Minhyea; Vale, Leila R.; Simmonds, Raymond W.; Aumentado, José |
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Title |
Quantum superposition of a single microwave photon in two different 'colour' states |
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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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Volume |
7 |
Issue |
8 |
Pages |
599-603 |
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fromIPMRAS |
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Fully controlled coherent coupling of arbitrary harmonic oscillators is an important tool for processing quantum information. Coupling between quantum harmonic oscillators has previously been demonstrated in several physical systems using a two-level system as a mediating element. Direct interaction at the quantum level has only recently been realized by means of resonant coupling between trapped ions. Here we implement a tunable direct coupling between the microwave harmonics of a superconducting resonator by means of parametric frequency conversion. We accomplish this by coupling the mode currents of two harmonics through a superconducting quantum interference device (SQUID) and modulating its flux at the difference (~7GHz) of the harmonic frequencies. We deterministically prepare a single-photon Fock state and coherently manipulate it between multiple modes, effectively controlling it in a superposition of two different 'colours'. This parametric interaction can be described as a beamsplitter-like operation that couples different frequency modes. As such, it could be used to implement linear optical quantum computing protocols on-chip. |
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RPLAB @ gujma @ |
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822 |
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