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1.
Synopsis
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Published November 16, 2009 Whether two quantum states can be distinguished over time provides a test to characterize noise from the environment. |
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Published October 19, 2009 A quantum algorithm that uses the solution to a set of linear equations provides an exponential speedup by comparison with classical alternatives. |
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Physics 2, 82 (2009) – Published October 5, 2009 Quantum Information Semiconductor Physics Mesoscopics Nanophysics A theoretical analysis of recent experiments suggests that a key feature of a topological quantum computer—the unusual statistics of quasiparticles in the quantum Hall effect—may finally have been observed. |
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Physics 2, 83 (2009) – Published October 5, 2009 An entangled state of six photons could potentially carry quantum information over large distances and between different reference frames. |
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Physics 2, 62 (2009) – Published July 20, 2009 This design of atomic quantum memory tells us when a pulse of light has been successfully stored and then proceeds to retrieve it without significantly affecting its polarization. The exquisite operation provides a new capability for quantum information networks. |
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Physics 2, 52 (2009) – Published June 22, 2009 A proposal for obtaining optical resolution better than the classical limit by means of spatially entangled quantum states of light opens a new frontier in the fields of quantum optical imaging, metrology, and sensing. |
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Published June 22, 2009 The demonstration of all-optical spin-echo measurements may provide a route toward decoupling spins from noise sources. |
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Published June 8, 2009 A system familiar in condensed matter—particles on a hexagonal lattice—could be a useful initial state for a one-way quantum computer. |
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Physics 2, 41 (2009) – Published May 18, 2009 Atomic & Molecular Physics Quantum Information Optics Loading cold atoms into a hollow-core optical fiber enables all-optical switching with just several hundred photons. |
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Trends
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Physics 2, 40 (2009) – Published May 18, 2009 Quantum Information Optics Quantum Mechanics Coherent optical systems combined with micromechanical devices may enable development of ultrasensitive force sensors and quantum information processing technology, as well as permit observation of quantum behavior in large-scale structures. |
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Physics 2, 38 (2009) – Published May 11, 2009 Entanglement may not be the source of a quantum computer’s power. But if not, what is? |
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Physics 2, 39 (2009) – Published May 11, 2009 Quantum Information Quantum Mechanics A new algorithm allows for the extremely efficient calculation of thermally averaged quantities in one dimension, in conjunction with the density matrix renormalization group method. The key is the judicious selection of a few representative states. |
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Trends
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Physics 2, 34 (2009) – Published April 27, 2009 Quantum Information Spintronics Creating a practical solid-state quantum computer is seriously hard. Getting such a computer to operate at room temperature is even more challenging. Is such a quantum computer possible at all? If so, which schemes might have a chance of success? |
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Physics 2, 16 (2009) – Published February 23, 2009 Quantum Information Spintronics Two theoretical studies reveal how one might achieve electric-field control of spin in semiconductors, both in an impurity-localized electron, and also with a quantum dot molecule. |
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Published February 2, 2009 A rigorous estimate shows that an error correction code for a scalable quantum computer can accommodate error at the 0.1% level—about ten times more tolerant than most other methods. |
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Physics 1, 39 (2008) – Published December 8, 2008 Preparing a harmonic oscillator in a state with a well-defined energy is a tricky business. With the new tools provided by cavity and circuit quantum electrodynamics it is now possible to make these pure quantum states and watch how they evolve in time. |
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Physics 1, 35 (2008) – Published November 17, 2008 Large-scale quantum computers are hard to construct because quantum systems easily lose their coherence through interaction with the environment. Researchers have tried to avoid this problem by using geometric phase shifts in the design of quantum gates to perform information processing. Experiments and simulations have shown that these gates may be tolerant to certain types of faults, and may therefore be useful for robust quantum computation. |
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Physics 1, 34 (2008) – Published November 10, 2008 Quantum measurements are conventionally thought of as irretrievably “collapsing” a wave function to the observed state. However, experiments with superconducting qubits show that the partial collapse resulting from a weak continuous measurement can be restored. |
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Physics 1, 23 (2008) – Published September 22, 2008 Laser beams made up of millions of sharply defined and coherently locked optical frequencies, called optical frequency combs, may provide a way to implement a powerful quantum computer. |
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Published August 25, 2008 Squeezed states can enhance the sensitivity of a detector and the storage capability of quantum memory devices. Because these features improve with an increase in system size, researchers are exploring ways to produce squeezed states in large ensembles of atoms. |
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Published July 28, 2008 Quantum Information Spintronics Spin decoherence is a fundamental obstacle in quantum computation and spintronics. Scientists show they can increase the lifetime of a localized spin in a diamond lattice up to 100 times by polarizing the surrounding spins on the lattice. |
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