| Records |
| Author |
Semenov, A. V.; Devyatov, I. A.; Korneev, A. A.; Smirnov, K. V.; Goltsman, G. N.; Melnikov, A. P. |
| Title |
Derivation of expression for thermodynamic potential of “dirty” superconductor |
Type |
Journal Article |
| Year |
2012 |
Publication |
Rus. J. Radio Electron. |
Abbreviated Journal |
Rus. J. Radio Electron. |
| Volume |
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Issue |
4 |
Pages |
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Keywords  |
dirty superconductor, Usadel theory, thermodynamic potential |
| Abstract |
We derive a formula for thermodynamic potential of dirty superconductor which express it via isotropic quasiclassical Green functions of Usadel theory. Our result allows unify description of dynamic processes and fluctuations in superconducting nano-electronic devices. |
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Russian |
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7 pages |
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Serial |
1824 |
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| Author |
Knee, George C.; Simmons, Stephanie; Gauger, Erik M.; Morton, John J. L.; Riemann, Helge; Abrosimov, Nikolai V.; Becker, Peter; Pohl, Hans-Joachim; Itoh, Kohei M.; Thewalt, Mike L. W.; Briggs, G. Andrew D.; Benjamin, Simon C. |
| Title |
Violation of a Leggett–Garg inequality with ideal non-invasive measurements |
Type |
Journal Article |
| Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
3 |
Issue |
606 |
Pages |
6 |
| Keywords |
fromIPMRAS |
| Abstract |
The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble. |
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no |
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RPLAB @ gujma @ |
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767 |
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| Author |
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. |
| Title |
Conclusive quantum steering with superconducting transition-edge sensors |
Type |
Journal Article |
| Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
3 |
Issue |
625 |
Pages |
6 |
| Keywords |
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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Ghali, Mohsen; Ohtani1, Keita; Ohno, Yuzo; Ohno, Hideo |
| Title |
Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field |
Type |
Journal Article |
| Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
3 |
Issue |
661 |
Pages |
6 |
| Keywords |
fromIPMRAS |
| Abstract |
Semiconductor quantum dots are potential sources for generating polarization-entangled photons efficiently. The main prerequisite for such generation based on biexciton-exciton cascaded emission is to control the exciton fine-structure splitting. Among various techniques investigated for this purpose, an electric field is a promising means to facilitate the integration into optoelectronic devices. Here we demonstrate the generation of polarization-entangled photons from single GaAs quantum dots by an electric field. In contrast to previous studies, which were limited to In(Ga)As quantum dots, GaAs island quantum dots formed by a thickness fluctuation were used because they exhibit a larger oscillator strength and emit light with a shorter wavelength. A forward voltage was applied to a Schottky diode to control the fine-structure splitting. We observed a decrease and suppression in the fine-structure splitting of the studied single quantum dot with the field, which enabled us to generate polarization-entangled photons with a high fidelity of 0.72 ± 0.05. |
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no |
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RPLAB @ gujma @ |
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769 |
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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. |
| Title |
Charge state manipulation of qubits in diamond |
Type |
Journal Article |
| Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
| Volume |
3 |
Issue |
729 |
Pages |
6 |
| Keywords |
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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