Zobrazeno 1 - 10
of 365
pro vyhledávání: '"Fiurášek, J."'
Publikováno v:
Phys. Rev. A 93, 042321 (2016)
We theoretically investigate and experimentally demonstrate a procedure for conditional control and enhancement of an interferometric coupling between two qubits encoded into states of bosonic particles. Our procedure combines local coupling of one o
Externí odkaz:
http://arxiv.org/abs/1701.05220
Publikováno v:
Phys. Rev. A 93, 052318 (2016)
We experimentally demonstrate the underlying physical mechanism of the recently proposed protocol for superreplication of quantum phase gates [W. D\"ur, P. Sekatski, and M. Skotiniotis, Phys. Rev. Lett. 114, 120503 (2015)], which allows to produce up
Externí odkaz:
http://arxiv.org/abs/1701.04062
Autor:
Micuda, M., Starek, R., Straka, I., Mikova, M., Dusek, M., Jezek, M., Filip, R., Fiurasek, J.
Publikováno v:
Phys. Rev. A 92, 022341 (2015)
We propose and experimentally demonstrate a scheme for implementation of a maximally entangling quantum controlled-Z gate between two weakly interacting systems. We conditionally enhance the interqubit coupling by quantum interference. Both before an
Externí odkaz:
http://arxiv.org/abs/1509.05682
Autor:
Mikova, M., Sedlak, M., Straka, I., Micuda, M., Ziman, M., Jezek, M., Dusek, M., Fiurasek, J.
Publikováno v:
Phys. Rev. A 90, 022317 (2014)
We investigate optimal discrimination between two projective single-qubit measurements in a scenario where the measurement can be performed only once. We consider general setting involving a tunable fraction of inconclusive outcomes and we prove that
Externí odkaz:
http://arxiv.org/abs/1408.0940
Publikováno v:
Phys. Rev. A 89, 042316 (2014)
A quantum analog of the fundamental classical NOT gate is a quantum gate that would transform any input qubit state onto an orthogonal state. Intriguingly, this universal NOT gate is forbidden by the laws of quantum physics. This striking phenomenon
Externí odkaz:
http://arxiv.org/abs/1404.4308
Publikováno v:
Phys. Rev. A 89, 062311 (2014)
We examine the behavior of non-Gaussian states of light under the action of probabilistic noiseless amplification and attenuation. Surprisingly, we find that the mean field amplitude may decrease in the process of noiseless amplification -- or increa
Externí odkaz:
http://arxiv.org/abs/1403.6054
Publikováno v:
Phys. Rev. A 89, 042304 (2014)
We present a systematic comparison of different methods of fidelity estimation of a linear optical quantum controlled-Z gate implemented by two-photon interference on a partially polarizing beam splitter. We have utilized a linear fidelity estimator
Externí odkaz:
http://arxiv.org/abs/1403.4863
Publikováno v:
Phys. Rev. A 86, 043813 (2012)
We experimentally verify the quantum non-Gaussian character of a conditionally generated noisy squeezed single-photon state with positive Wigner function. Employing an optimized witness based on probabilities of squeezed vacuum and squeezed single-ph
Externí odkaz:
http://arxiv.org/abs/1206.7057
Publikováno v:
Nature Photonics 5, 52 (2011)
Noise is the price to pay when trying to clone or amplify arbitrary quantum states. The quantum noise associated to linear phase-insensitive amplifiers can only be avoided by relaxing the requirement of a deterministic operation. Here we present the
Externí odkaz:
http://arxiv.org/abs/1004.3399
Publikováno v:
Phys. Rev. Lett. 100, 180501 (2008).
We present a linear-optical implementation of a class of two-qubit partial SWAP gates for polarization states of photons. Different gate operations, including the SWAP and entangling square root of SWAP, can be obtained by changing a classical contro
Externí odkaz:
http://arxiv.org/abs/0711.4534