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Author Saunders, D. J.; Jones, S. J.; Wiseman, H. M.; Pryde, G. J.
Title Experimental EPR-steering using Bell-local states Type Journal Article
Year (up) 2010 Publication Nat. Phys. Abbreviated Journal Nat. Phys.
Volume 6 Issue 11 Pages 845-849
Keywords fromIPMRAS
Abstract The concept of `steering' was introduced in 1935 by Schrödinger as a generalization of the EPR (Einstein-Podolsky-Rosen) paradox. It has recently been formalized as a quantum-information task with arbitrary bipartite states and measurements, for which the existence of entanglement is necessary but not sufficient. Previous experiments in this area have been restricted to an approach that followed the original EPR argument in considering only two different measurement settings per side. Here we demonstrate experimentally that EPR-steering occurs for mixed entangled states that are Bell local (that is, that cannot possibly demonstrate Bell non-locality). Unlike the case of Bell inequalities, increasing the number of measurement settings beyond two-we use up to six-significantly increases the robustness of the EPR-steering phenomenon to noise.
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Call Number RPLAB @ gujma @ Serial 808
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Author Toyabe, Shoichi; Sagawa, Takahiro; Ueda, Masahito; Muneyuki, Eiro; Sano, Masaki
Title Experimental demonstration of information-to-energy conversion and validation of the generalized Jarzynski equality Type Journal Article
Year (up) 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue 12 Pages 988-992
Keywords fromIPMRAS
Abstract In 1929, Leo Szilard invented a feedback protocol in which a hypothetical intelligence called Maxwell's demon pumps heat from an isothermal environment and transduces it to work. After an intense controversy that lasted over eighty years; it was finally clarified that the demon's role does not contradict the second law of thermodynamics, implying that we can convert information to free energy in principle. Nevertheless, experimental demonstration of this information-to-energy conversion has been elusive. Here, we demonstrate that a nonequilibrium feedback manipulation of a Brownian particle based on information about its location achieves a Szilard-type information-energy conversion. Under real-time feedback control, the particle climbs up a spiral-stairs-like potential exerted by an electric field and obtains free energy larger than the amount of work performed on it. This enables us to verify the generalized Jarzynski equality, or a new fundamental principle of “information-heat engine” which converts information to energy by feedback control.
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Call Number RPLAB @ gujma @ Serial 831
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Author Home, Jonathan
Title Quantum entanglement: Watching correlations disappear Type Journal Article
Year (up) 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue 12 Pages 938-939
Keywords fromIPMRAS
Abstract Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays.
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Call Number RPLAB @ gujma @ Serial 832
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Author Saffman, Mark
Title Quantum computing: A quantum telecom link Type Journal Article
Year (up) 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue 11 Pages 838-839
Keywords fromIPMRAS
Abstract Converting data-carrying photons to telecommunication wavelengths enables distribution of quantum information over long distances.
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Call Number RPLAB @ gujma @ Serial 833
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Author Raussendorf, Robert
Title Quantum computing: Shaking up ground states Type Journal Article
Year (up) 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue 11 Pages 840-841
Keywords fromIPMRAS
Abstract Measurement-based quantum computation with an Affleck-Kennedy-Lieb-Tasaki state is experimentally realized for the first time.
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Call Number RPLAB @ gujma @ Serial 834
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Author Buchanan, Mark
Title Body of evidence Type Manuscript
Year (up) 2010 Publication Nature Physics Abbreviated Journal Nat. Phys.
Volume 6 Issue Pages
Keywords fromIPMRAS
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Call Number RPLAB @ gujma @ Serial 837
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Author 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 (up) 2011 Publication Nature Communications Abbreviated Journal Nat. Comm.
Volume 2 Issue 224 Pages 6
Keywords 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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Call Number RPLAB @ gujma @ Serial 763
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Author Ikuta, Rikizo; Kusaka, Yoshiaki; Kitano, suyoshi; Kato, Hiroshi; Yamamoto, Takashi; Koashi, Masato; Imoto, Nobuyuki
Title Wide-band quantum interface for visible-totelecommunication wavelength conversion Type Journal Article
Year (up) 2011 Publication Nature Communications Abbreviated Journal Nat. Comm.
Volume 2 Issue Pages 5
Keywords 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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Call Number RPLAB @ gujma @ Serial 764
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Author 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 (up) 2011 Publication Nature Communications Abbreviated Journal Nat. Comm.
Volume 2 Issue 566 Pages 6
Keywords 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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Call Number RPLAB @ gujma @ Serial 765
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Author Berlín, Guido; Brassard, Gilles; Bussières, Félix; Godbout, Nicolas; Slater, Joshua A.; Tittel, Wolfgang
Title Experimental loss-tolerant quantum coin flipping Type Journal Article
Year (up) 2011 Publication Nature Communications Abbreviated Journal Nat. Comm.
Volume 2 Issue 561 Pages 7
Keywords 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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Call Number RPLAB @ gujma @ Serial 766
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Author Kono, Junichiro
Title Coherent terahertz control Type Journal Article
Year (up) 2011 Publication Nature Photonics Abbreviated Journal Nat. Photon.
Volume 5 Issue Pages 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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Call Number RPLAB @ gujma @ Serial 773
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Author Paiella, Roberto
Title Terahertz quantum cascade lasers: Going ultrafast Type Journal Article
Year (up) 2011 Publication Nature Photonics Abbreviated Journal Nat. Photon.
Volume 5 Issue Pages 253–255
Keywords fromIPMRAS
Abstract A new asynchronous coherent optical sampling method allows for the direct visualization of actively mode-locked quantum cascade laser pulses at terahertz wavelengths.
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Call Number RPLAB @ gujma @ Serial 774
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Author Wu, Ming C.
Title Optoelectronic tweezers Type Journal Article
Year (up) 2011 Publication Nature Photonics Abbreviated Journal Nature Photon
Volume 5 Issue 6 Pages 322-324
Keywords fromIPMRAS
Abstract Using projected light patterns to form virtual electrodes on a photosensitive substrate, optoelectronic tweezers are able to grab and move micro- and nanoscale objects at will, facilitating applications far beyond biology and colloidal science.
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Call Number RPLAB @ gujma @ Serial 775
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Author Fazal, Furqan M.; Block, Steven M.
Title Optical tweezers study life under tension Type Journal Article
Year (up) 2011 Publication Nature Photonics Abbreviated Journal Nat. Photon.
Volume 5 Issue 6 Pages 318-321
Keywords fromIPMRAS
Abstract 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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Call Number RPLAB @ gujma @ Serial 776
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Author Gabay, Marc; Triscone, Jean-Marc
Title Superconductors: Terahertz superconducting switch Type Journal Article
Year (up) 2011 Publication Nature Photonics Abbreviated Journal Nat. Photon.
Volume 5 Issue 8 Pages 447-449
Keywords fromIPMRAS
Abstract 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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Call Number RPLAB @ gujma @ Serial 777
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