"Entangled two-photon states are often generated in the process of spontaneous parametric down-conversion. The two photons comprising one pair are tighly correlated in energy and time. The width of these correlations are investigated in interferometric experiments. Unbalanced Mach-Zehnder interferometer in the route of one photon together with a narrow frequency filter in the route of the other one is used to evaluate the widh of the energy correlations. Hong-Ou-Mandel interferometer serves for measurement of the time correlations with the same two-photon source. The measurement results approve the theoretical relation between the time and spectral (energetic) correlations expected for given entangled states. Both the strong energy correlations and narrow time correlations of the detection instants may be exhibited together only by an entangled state."@en . . . "Experiment\u00E1ln\u00ED ov\u011B\u0159ov\u00E1n\u00ED energetick\u00E9 a \u010Dasov\u00E9 prov\u00E1zanosti"@cs . "8"^^ . . "5"^^ . "HU - Ma\u010Farsko" . . . . "Entanglovan\u00E9 (prov\u00E1zan\u00E9) kvantov\u00E9 stavy se \u010Dasto generuj\u00ED v procesu spont\u00E1nn\u00ED parametrick\u00E9 sestupn\u00E9 konverze. Dva fotony, kter\u00E9 spolu tvo\u0159\u00ED tento p\u00E1r jsou p\u0159esn\u011B korelovan\u00E9 v energii a v \u010Dase. \u0160\u00ED\u0159ka t\u011Bchto korelac\u00ED se zkoum\u00E1 pomoc\u00ED interferen\u010Dn\u00EDch experiment\u016F. Jeden foton proch\u00E1z\u00ED skrz nevyv\u00E1\u017Een\u00FD Mach\u016Fv-Zehnder\u016Fv interferometr a sou\u010Dasn\u011B druh\u00FD foton proch\u00E1z\u00ED skrz \u00FAzk\u00FD frekven\u010Dn\u00ED filtr. Toto za\u0159\u00EDzen\u00ED slou\u017E\u00ED k ur\u010Den\u00ED \u0161\u00ED\u0159ky energetick\u00FDch korelac\u00ED. Hong\u016Fv-Ou\u016Fv-Mandel\u016Fv interferometr slou\u017E\u00ED k m\u011B\u0159en\u00ED \u010Dasov\u00FDch korelac\u00ED pro stejn\u00FD dvoufotonov\u00FD stav. V\u00FDsledky m\u011B\u0159en\u00ED potvrzuj\u00ED teoretick\u00FD vztah mezi korelacemi v \u010Dase a ve spektru (energii), kter\u00E9 lze o\u010Dek\u00E1vat pro dan\u00FD entanglovan\u00FD stav. Oba v\u00FDsledky, siln\u00E9 energetick\u00E9 korelace a \u00FAzk\u00E9 \u010Dasov\u00E9 korelace detek\u010Dn\u00EDch ud\u00E1lost\u00ED, mohou vzniknout sou\u010Dasn\u011B jen d\u00EDky tomu, \u017Ee m\u011B\u0159en\u00FD stav je entanglovan\u00FD."@cs . "143;150" . "Hendrych, Martin" . "Experimental tests of energy and time entanglement" . "Acta Physica Hungarica. B. Quantum Electronics" . "4"^^ . "[2A94E3D830D6]" . "RIV/68378271:_____/05:00040842" . "Entangled two-photon states are often generated in the process of spontaneous parametric down-conversion. The two photons comprising one pair are tighly correlated in energy and time. The width of these correlations are investigated in interferometric experiments. Unbalanced Mach-Zehnder interferometer in the route of one photon together with a narrow frequency filter in the route of the other one is used to evaluate the widh of the energy correlations. Hong-Ou-Mandel interferometer serves for measurement of the time correlations with the same two-photon source. The measurement results approve the theoretical relation between the time and spectral (energetic) correlations expected for given entangled states. Both the strong energy correlations and narrow time correlations of the detection instants may be exhibited together only by an entangled state." . . "521087" . . "Experimental tests of energy and time entanglement"@en . . "23" . "1589-9535" . . "Haderka, Ond\u0159ej" . "Du\u0161ek, M." . "Experimental tests of energy and time entanglement" . . "down-corversion; interference"@en . "P(LN00A015), Z(AV0Z10100522)" . . . "Pe\u0159ina jr., Jan" . . "Experiment\u00E1ln\u00ED ov\u011B\u0159ov\u00E1n\u00ED energetick\u00E9 a \u010Dasov\u00E9 prov\u00E1zanosti"@cs . . "Experimental tests of energy and time entanglement"@en . . . "Soubusta, Jan" . "RIV/68378271:_____/05:00040842!RIV07-AV0-68378271" . . . "3-4" .