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Author |
Buchanan, Mark |
Title |
Nothing's impossible |
Type |
Manuscript |
Year |
2011 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
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5 |
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fromIPMRAS |
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RPLAB @ gujma @ |
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839 |
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Nevou, L.; Liverini, V.; Friedli, P.; Castellano, F.; Bismuto, A.; Sigg, H.; Gramm, F.; Müller, E.; Faist, J. |
Title |
Current quantization in an optically driven electron pump based on self-assembled quantum dots |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
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Pages |
423–427 |
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fromIPMRAS |
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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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Author |
Gao, Jie; McMillan, James F.; Wong, Chee Wei |
Title |
Nanophotonics: Remote on-chip coupling |
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Journal Article |
Year |
2012 |
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Nature Photonics |
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Nat. Photon. |
Volume |
6 |
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1 |
Pages |
7-8 |
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fromIPMRAS |
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Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing. |
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RPLAB @ gujma @ |
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779 |
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Author |
Pile, David |
Title |
How many bits can a photon carry |
Type |
Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
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1 |
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14-15 |
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fromIPMRAS |
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Quantum physics offers a way to enhance the amount of information a photon can carry, with potential applications in optical communication, lithography, metrology and imaging. |
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View from... OSA Frontiers in Optics 2011: How many bits can a photon carry? |
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no |
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RPLAB @ gujma @ |
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780 |
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Hanneke, D.; Home, J. P.; Jost, J. D.; Amini, J. M.; Leibfried, D.; Wineland, D. J. |
Title |
Realization of a programmable two-qubit quantum processor |
Type |
Journal Article |
Year |
2010 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
6 |
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1 |
Pages |
13-16 |
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fromIPMRAS |
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The universal quantum computer is a device capable of simulating any physical system and represents a major goal for the field of quantum information science. In the context of quantum information, `universal' refers to the ability to carry out arbitrary unitary transformations in the system's computational space. Combining arbitrary single-quantum-bit (qubit) gates with an entangling two-qubit gate provides a set of gates capable of achieving universal control of any number of qubits, provided that these gates can be carried out repeatedly and between arbitrary pairs of qubits. Although gate sets have been demonstrated in several technologies, they have so far been tailored towards specific tasks, forming a small subset of all unitary operators. Here we demonstrate a quantum processor that can be programmed with 15 classical inputs to realize arbitrary unitary transformations on two qubits, which are stored in trapped atomic ions. Using quantum state and process tomography, we characterize the fidelity of our implementation for 160 randomly chosen operations. This universal control is equivalent to simulating any pairwise interaction between spin-1/2 systems. A programmable multiqubit register could form a core component of a large-scale quantum processor, and the methods used here are suitable for such a device. |
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RPLAB @ gujma @ |
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801 |
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Author |
Zhu, J.; Christensen, J.; Jung, J.; Martin-Moreno, L.; Yin, X.; Fok, L.; Zhang, X.; Garcia-Vidal, F. J. |
Title |
A holey-structured metamaterial for acoustic deep-subwavelength imaging |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
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1 |
Pages |
52-55 |
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fromIPMRAS |
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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 |
Zhang, Qiang; Goebel, Alexander; Wagenknecht, Claudia; Chen, Yu-Ao; Zhao, Bo; Yang, Tao; Mair, Alois; Schmiedmayer, Jörg; Pan, Jian-Wei |
Title |
Experimental quantum teleportation of a two-qubit composite system |
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Journal Article |
Year |
2006 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
2 |
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10 |
Pages |
678-682 |
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fromIPMRAS; quantum teleportation |
Abstract |
Quantum teleportation, a way to transfer the state of a quantum system from one location to another, is central to quantum communication and plays an important role in a number of quantum computation protocols. Previous experimental demonstrations have been implemented with single photonic or ionic qubits. However, teleportation of single qubits is insufficient for a large-scale realization of quantum communication and computation. Here, we present the experimental realization of quantum teleportation of a two-qubit composite system. In the experiment, we develop and exploit a six-photon interferometer to teleport an arbitrary polarization state of two photons. The observed teleportation fidelities for different initial states are all well beyond the state estimation limit of 0.40 for a two-qubit system. Not only does our six-photon interferometer provide an important step towards teleportation of a complex system, it will also enable future experimental investigations on a number of fundamental quantum communication and computation protocols |
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no |
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RPLAB @ gujma @ |
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795 |
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Author |
Prevedel, Robert; Hamel, Deny R.; Colbeck, Roger; Fisher, Kent; Resch, Kevin J. |
Title |
Experimental investigation of the uncertainty principle in the presence of quantum memory and its application to witnessing entanglement |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
10 |
Pages |
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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no |
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RPLAB @ gujma @ |
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821 |
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Fuchs, G. D.; Burkard, G.; Klimov, P. V.; Awschalom, D. D. |
Title |
A quantum memory intrinsic to single nitrogen–vacancy centres in diamond |
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Journal Article |
Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
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10 |
Pages |
789-793 |
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fromIPMRAS |
Abstract |
A quantum memory, composed of a long-lived qubit coupled to each processing qubit, is important to building a scalable platform for quantum information science. These two qubits should be connected by a fast and high-fidelity operation to store and retrieve coherent quantum states. Here, we demonstrate a room-temperature quantum memory based on the spin of the nitrogen nucleus intrinsic to each nitrogen–vacancy (NV) centre in diamond. We perform coherent storage of a single NV centre electronic spin in a single nitrogen nuclear spin using Landau–Zener transitions across a hyperfine-mediated avoided level crossing. By working outside the asymptotic regime, we demonstrate coherent state transfer in as little as 120 ns with total storage fidelity of 88±6%. This work demonstrates the use of a quantum memory that is compatible with scaling as the nitrogen nucleus is deterministically present in each NV centre defect. |
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RPLAB @ gujma @ |
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823 |
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Author |
Hosseini, M.; Campbell, G.; Sparkes, B. M.; Lam, P. K.; Buchler, B. C. |
Title |
Unconditional room-temperature quantum memory |
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Journal Article |
Year |
2011 |
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Nature Physics |
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Nat. Phys. |
Volume |
7 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
10 |
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794-798 |
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fromIPMRAS |
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Just as classical information systems require buffers and memory, the same is true for quantum information systems. The potential that optical quantum information processing holds for revolutionizing computation and communication is therefore driving significant research into developing optical quantum memory. A practical optical quantum memory must be able to store and recall quantum states on demand with high efficiency and low noise. Ideally, the platform for the memory would also be simple and inexpensive. Here, we present a complete tomographic reconstruction of quantum states that have been stored in the ground states of rubidium in a vapour cell operating at around 80 °C. Without conditional measurements, we show recall fidelity up to 98% for coherent pulses containing around one photon. To unambiguously verify that our memory beats the quantum no-cloning limit we employ state-independent verification using conditional variance and signal-transfer coefficients. |
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RPLAB @ gujma @ |
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824 |
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Saunders, D. J.; Jones, S. J.; Wiseman, H. M.; Pryde, G. J. |
Title |
Experimental EPR-steering using Bell-local states |
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Journal Article |
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2010 |
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Nat. Phys. |
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Nat. Phys. |
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6 |
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11 |
Pages |
845-849 |
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fromIPMRAS |
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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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RPLAB @ gujma @ |
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808 |
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Arcizet, O.; Jacques, V.; Siria, A.; Poncharal, P.; Vincent, P.; Seidelin, S. |
Title |
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 |
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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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Saffman, Mark |
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Quantum computing: A quantum telecom link |
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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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838-839 |
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Converting data-carrying photons to telecommunication wavelengths enables distribution of quantum information over long distances. |
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833 |
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Raussendorf, Robert |
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Quantum computing: Shaking up ground states |
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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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11 |
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840-841 |
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fromIPMRAS |
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Measurement-based quantum computation with an Affleck-Kennedy-Lieb-Tasaki state is experimentally realized for the first time. |
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RPLAB @ gujma @ |
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834 |
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Capmany, José; Gasulla, Ivana; Sales, Salvador |
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Microwave photonics: Harnessing slow light |
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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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12 |
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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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RPLAB @ gujma @ |
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778 |
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