Abstract: A device for generating individual photons with energy E includes quantum emitters, having at least one determined transition with the energy E from an energy level N* to a lower energy level N1. The emitters are near a propagation path running from first to second regions. The device also includes at least one light source to output light, for propagation along the path. The light has the energy E for resonant excitation of the energy level N*. The emitters are arranged so that optionally exactly Z emitters are illuminated, forming an optical thickness ?>0 for the light along the path. The number Z lies in a range of Z0±10% and Z0 is a number at which a maximum destructive interference in the second region occurs between a two-photon component of the light scattered on the ZO emitters and a two-photon component of the non-scattered light.

Abstract: A device for generating individual photons with energy E includes quantum emitters, having at least one determined transition with the energy E from an energy level N* to a lower energy level N1. The emitters are near a propagation path running from first to second regions. The device also includes at least one light source to output light, for propagation along the path. The light has the energy E for resonant excitation of the energy level N*. The emitters are arranged so that optionally exactly Z emitters are illuminated, forming an optical thickness ?>0 for the light along the path. The number Z lies in a range of ZO±10% and ZO is a number at which a maximum destructive interference in the second region occurs between a two-photon component of the light scattered on the ZO emitters and a two-photon component of the non-scattered light.

Abstract: An optical diode (1) comprising an optical wave guide for guiding light, preferably of a light mode, with a vacuum wavelength ?0, wherein the optical wave guide has a wave guide core (2, 3, 14) with a first index of refraction (n1), and the wave guide core (2, 3, 14) is surrounded by at least one second optical medium which has at least one second index of refraction (n2), wherein n1>n2 applies, wherein the wave guide core (2, 3, 14) has at least in sections a smallest lateral dimension (7) which is a smallest dimension of a cross section (6) perpendicular to a propagation direction (5) of the light in the wave guide core (2, 3, 14), wherein the smallest lateral dimension (7) is greater than or equal to ?0/(5*n1) and less than or equal to 20*?0/n1, wherein the optical diode (1) additionally comprises at least one absorber element (10, 11, 15, 16) which is arranged in a near field, wherein the near field consists of the electromagnetic field of the light of the vacuum wavelength ?0 in the wave guide core (2

Abstract: An optical diode (1) comprising an optical wave guide for guiding light, preferably of a light mode, with a vacuum wavelength ?0, wherein the optical wave guide has a wave guide core (2, 3, 14) with a first index of refraction (n1), and the wave guide core (2, 3, 14) is surrounded by at least one second optical medium which has at least one second index of refraction (n2), wherein n1>n2 applies, wherein the wave guide core (2, 3, 14) has at least in sections a smallest lateral dimension (7) which is a smallest dimension of a cross section (6) perpendicular to a propagation direction (5) of the light in the wave guide core (2, 3, 14), wherein the smallest lateral dimension (7) is greater than or equal to ?0/(5*n1) and less than or equal to 20*?0/n1, wherein the optical diode (1) additionally comprises at least one absorber element (10, 11, 15, 16) which is arranged in a near field, wherein the near field consists of the electromagnetic field of the light of the vacuum wavelength ?0 in the wave guide core (2