60results about How to "Information stability" patented technology

The invention provides systems and methods enabling high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels. The invention involves laser manipulation of quantum correlated atomic ensembles using linear optic components (110, 120), optical sources of low intensity pulses (10), interferers in the form of beam splitters (150), and single-photon detectors (180, 190) requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation and connection using a sequence of steps that each provide built-in entanglement purification and that are each resilient to realistic noise levels. The invention relies upon collective rather single particle excitations in atomic ensembles and results in communication efficiency scaling polynomially with the total length of the communication channel.

An optical information recording and reproducing device 1 irradiates initialization light L1 to an optical information recording medium 100 having a recording layer 101 made of photopolymerization-type photopolymer in advance to bring about the photopolymerization or the photocrosslinking to perform the initialization processing, and condenses a recording light beam L2c having a comparatively strong light intensity to a target position in the recording layer 101 and increases the temperature thereof to transubstantiate the target position to record a recording mark RM at the time of recording information, and condenses a reading light beam L2d having a comparatively weak light intensity to the target position and receives a returned light beam L3 having a sufficient light amount reflected by the recording mark RM at the time of reproducing information, which makes it possible to reliably record the recording mark RM and stably read out the recording mark RM.

A hologram recording medium is for recording or reproducing information with light irradiated thereto. The medium has a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of the recording layer from a light irradiated side, tracks formed on the reflective layer such that the tracks are spaced apart by a first pitch from each other to extend without intersection, and positioning marks formed on the reflective layer such that the positioning marks are spaced apart by a second pitch from each other in a direction in which the tracks extend. The second pitch is a function of the first pitch.

For application of asymmetry trial writing onto phasechange recording discs, this invention is intended to determine an optimum level of recording power accurately. Single pattern or random pattern signals are recorded, and phase differences between PLL clock edges and data edges are detected using reproduced signals to determine a threshold value of recording power where a predetermined percentage of phase differences occurs. The threshold power is then multiplied by a constant to provide a optimum level of recording power. Further, there are disclosed arrangements for determining an optimum power condition at a point where an error count (jitter) is minimized, and determining an optimum power condition as an averaged power level existing between low and high power conditions.

The present invention provides an optical pick-up device capable of suppressing the inclination of a lens actuator in the jitter direction caused by the variation of the ambient temperature thereof to stably record or reproduce information to or from an optical disk. In the optical pick-up device, a supporting member 106 for fixing one end of each of suspension members 105 is arranged on a rear side of a suspension holder 2 fixed to a yoke base 103, and an object lens 102 is displaced by servo-controlling a lens holder 101 for holding the other ends of the suspension members in an electromagnetic driving manner to adjust the irradiation position of a beam spot on an optical disk. The suspension holder 2 is formed of a plurality of members having different coefficients of linear expansion, and the members having a higher coefficient of linear expansion are arranged on the rear side of the suspension holder 2. Therefore, the supporting member 106 is displaced by the linear expansion of the members having a higher coefficient of linear expansion according to the variation of temperature, thereby suppressing inclination of a lens actuator L.

The invention provides systems and methods enabling high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels. The invention involves laser manipulation of quantum correlated atomic ensembles using linear optic components (110, 120), optical sources of low intensity pulses (10), interferers in the form of beam splitters (150), and single-photon detectors (180, 190) requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation and connection using a sequence of steps that each provide built-in entanglement purification and that are each resilient to realistic noise levels. The invention relies upon collective rather single particle excitations in atomic ensembles and results in communication efficiency scaling polynomially with the total length of the communication channel.

To provide a two-dimensional modulation method for hologram recording which is capable of preventing degradation of reconstructing performance when positional shift occurs and which enables information to be stably recorded or reproduced. The hologram recording carrier employs the two-dimensional modulation method for hologram recording for generating coherent light containing therein page data through a spatial light modulator having a plurality of pixels two-dimensionally arranged therein, in which the pixels of the spatial light modulator are partitioned into a plurality of blocks consisting of m pixels adjacent to each other (where m=an integral number), and a boundary portion which has a width having at least the width of one pixel of the spatial light modulator or of one pixel of an image detecting sensor used to reproduce the recorded page data and the distance between the adjacent pixels in each of the blocks, and each of which shields light is provided between the adjacent blocks.

An optical pickup includes: an objective lens that collects a first beam and a second beam and emits the first and second beam toward an optical information recording medium on which information can be recorded as a recording mark as a result of being exposed to the first beam; a section that drives the objective lens to focus the second beam on a reflection layer formed on the optical information recording medium, the reflection layer at least partly reflecting the second beam; and a section that changes the convergence state of the first beam to position a focal point of the first beam a distance away from a focal point of the second beam in the direction of depth in order to place the focal point of the first beam at a target depth.

According to an embodiment, a wireless communication system for power supply and demand control comprises a plurality of wireless devices to form an autonomous distributed wireless network, and is configured to transmit information to a plurality of aggregation apparatuses or a management apparatus via the autonomous distributed wireless network. The management apparatus comprises a first control section configured to generate an affiliation change instruction to the wireless devices. The wireless device comprises a storage section configured to store information belonging to a first aggregation apparatus, and a second control section configured to change an affiliation destination from the first aggregation apparatus to a second aggregation apparatus based on the affiliation change instruction.

An optical information recording and reproducing device 1 irradiates initialization light L1 to an optical information recording medium 100 having a recording layer 101 made of photopolymerization-type photopolymer in advance to bring about the photopolymerization or the photocrosslinking to perform the initialization processing, and condenses a recording light beam L2c having a comparatively strong light intensity to a target position in the recording layer 101 and increases the temperature thereof to transubstantiate the target position to record a recording mark RM at the time of recording information, and condenses a reading light beam L2d having a comparatively weak light intensity to the target position and receives a returned light beam L3 having a sufficient light amount reflected by the recording mark RM at the time of reproducing information, which makes it possible to reliably record the recording mark RM and stably read out the recording mark RM.

A block where basic units of a background pattern are arranged two-dimensionally is formed so as to stably read buried information from a printed background pattern. Binary or multivalued number is assigned to the block to express information. When a binary number (bit) is assigned to a block made up of background patterns in double size, error correction can be made if an error occurs only in one background pattern while reading the block. In each background pattern, a diagonal lacking its center part is drawn, and isolated dots are placed along the other diagonal. With this, while ensuring the stability of reading the buried information after the read by a scanner, the uniformness of appearance of the printed object can be ensured.