Zobrazeno 1 - 10
of 536
pro vyhledávání: '"Laflamme, R."'
Publikováno v:
Phys. Rev. A 95, 042343 (2017)
A quantum algorithm that solves the time-dependent Dirac equation on a digital quantum computer is developed and analyzed. The time evolution is performed by an operator splitting decomposition technique that allows for a mapping of the Dirac operato
Externí odkaz:
http://arxiv.org/abs/1611.05484
Publikováno v:
Phys. Rev. A 95, 042331 (2017)
An algorithm that initializes a quantum register to a state with a specified energy range is given, corresponding to a quantum implementation of the celebrated Feit-Fleck method. This is performed by introducing a nondeterministic quantum implementat
Externí odkaz:
http://arxiv.org/abs/1605.02747
Autor:
Erven, C., Meyer-Scott, E., Fisher, K., Lavoie, J., Higgins, B. L., Yan, Z., Pugh, C. J., Bourgoin, J. -P., Prevedel, R., Shalm, L. K., Richards, L., Gigov, N., Laflamme, R., Weihs, G., Jennewein, T., Resch, K. J.
Publikováno v:
Nature Photonics 8, 292-296 (2014)
Quantum correlations are critical to our understanding of nature, with far-reaching technological and fundamental impact. These often manifest as violations of Bell's inequalities, bounds derived from the assumptions of locality and realism, concepts
Externí odkaz:
http://arxiv.org/abs/1309.1379
Publikováno v:
Nature Communications 5, 3418 (2014)
Cryptography's importance in our everyday lives continues to grow in our increasingly digital world. Oblivious transfer (OT) has long been a fundamental and important cryptographic primitive since it is known that general two-party cryptographic task
Externí odkaz:
http://arxiv.org/abs/1308.5098
Autor:
Bourgoin, J. -P., Meyer-Scott, E., Higgins, B. L., Helou, B., Erven, C., Huebel, H., Kumar, B., Hudson, D., D'Souza, I., Girard, R., Laflamme, R., Jennewein, T.
Publikováno v:
New J. Phys. 15, 023006 (2013)
Optical quantum communication utilizing satellite platforms has the potential to extend the reach of quantum key distribution (QKD) from terrestrial limits of ~200 km to global scales. We have developed a thorough numerical simulation using realistic
Externí odkaz:
http://arxiv.org/abs/1211.2733
Studying Free-Space Transmission Statistics and Improving Free-Space QKD in the Turbulent Atmosphere
Autor:
Erven, C., Heim, B., Meyer-Scott, E., Bourgoin, J. P., Laflamme, R., Weihs, G., Jennewein, T.
Publikováno v:
New J. Phys. 14, 123018 (2012)
The statistical fluctuations in free-space links in the turbulent atmosphere are important for the distribution of quantum signals. To that end, we first study statistics generated by the turbulent atmosphere in an entanglement based free-space quant
Externí odkaz:
http://arxiv.org/abs/1208.0609
Publikováno v:
Phys. Rev. A 85, 032325 (2012)
We describe an efficient DQC1-algorithm to quantify the amount of Geometric Quantum Discord present in the output state of a DQC1 computation. DQC1 is a model of computation that utilizes separable states to solve a problem with no known efficient cl
Externí odkaz:
http://arxiv.org/abs/1202.4475
Publikováno v:
Phys. Rev. A. 84, 044302 (2011)
We report on an experiment to detect non-classical correlations in a highly mixed state. The correlations are characterized by the quantum discord and are observed using four qubits in a liquid state nuclear magnetic resonance quantum information pro
Externí odkaz:
http://arxiv.org/abs/1105.2262
Publikováno v:
Phys. Rev. Lett. 105, 240406 (2010)
Geometric phases, arising from cyclic evolutions in a curved parameter space, appear in a wealth of physical settings. Recently, and largely motivated by the need of an experimentally realistic definition for quantum computing applications, the quant
Externí odkaz:
http://arxiv.org/abs/1006.1468
Publikováno v:
Phys. Rev. Lett. 104, 160501 (2010)
We present a protocol to evaluate the expectation value of the correlations of measurement outcomes for ensembles of quantum systems, and use it to experimentally demonstrate--under an assumption of fair sampling--the violation of an inequality that
Externí odkaz:
http://arxiv.org/abs/0912.0485