Canon Kabushiki Kaisha

Hitachi, Ltd.

Hiroo Azuma

Kohei Nakata

Masaaki Ogura

Yasuhiro Shimada

Takehiko Kawasaki

Kiyoshi Takimoto

Takeo Yamazaki

Masashi Ban

An apparatus for generating a quantum state of a two-qubit system including two qubits, each qubit being represented by a particle which invariably travels through one of two paths, includes a quantum gate composed of an interferometer for implementing an-interaction-free measurement. The apparatus receives two particles having no correlation and generates a Bell state with asymptotic probability 1. A Bell measurement of a state of a two-qubit system is performed by observing a quantum gate composed of the interferometer after the quantum gate has processed the state and selecting the state from the Bell bases. An approximate fidelity of a quantum gate composed of the interferometer is calculated, if an absorption probability with which a first particle absorbs a second particle in the interferometer is less than 1, under the condition that the number of times the second particle hits beam splitters in the interferometer is sufficiently large.

Quantum-state-generating apparatus, Bell measurement apparatus, quantum gate apparatus, and method for evaluating fidelity of quantum gate

Arbitrary quantum information is input. The information of a quantum two-state system is acquired as a qubit by performing a computation in consideration of a physical system. The acquired qubit is encrypted. A quantum system having signature information for guaranteeing that the qubit is really transferred from a sender to a recipient is added to the encrypted qubit. The qubit to which the quantum system having the signature information is added is further encrypted. In this manner, an arbitrary quantum state can be encrypted and transmitted without letting the sender and recipient share an entangled pair of qubits in advance.

Encryption method and apparatus encrypting and adding signature information to qubits

If a quantum mechanical state including a plurality of two-level systems (x , x , . . . , x ) is expressed by a superposition of orthonormal bases in which each two-level system assumes a basic or an excited state, a quantum gate network is used to perform an operation including a combination of a selective rotation operation and an inversion about average operation D in order to configure a desired partly-entangled quantum mechanical state in which the coefficients of the respective bases are all real numbers.

Method and apparatus for configuring quantum mechanical state, and communication method and apparatus using the same

An image display apparatus which is subjected to getter flashing during manufacturing, for the purpose of increasing the degree of vacuum in the air-tight container thereof, is provided with a getter scattering prevention member comprised of a plurality of getter scattering prevention walls. The getter scattering prevention walls prevent getter material from scattering to the image display portion of the image display apparatus, while allowing for smooth conductance of gas in the air-tight container during evacuation. Thus, evacuation by the getter can be further improved by increasing the area to which getter adheres to, deterioration of the image quality can be prevented by not allowing getter to adhere to the image display portion, the air-tight container can be evacuated in a shorter time, irregularities in brightness of the screen due to uneven pressure within the display portion can be done away with, and a higher degree of vacuum can be attained. Consequently, an image display apparatus with good image quality and a long life expectancy is provided.

Image display apparatus

Probe including a cantilever having a movable end and formed from an elastic body, an electroconductive sensing needle arranged at the movable end of the cantilever, and a field effect transistor arranged at the movable end of the cantilever and having a gate electrode electronically connected to the electroconductive sensing needle. The probe may further comprise another field effect transistor formed on the cantilever and having its drain electrically connected to the sensing needle. The probe may be used in an information recording/reproduction apparatus.

Probe and information recording/reproduction apparatus using the same

If a quantum mechanical state including a plurality of two-level systems (X,, X,, . . . , X,) is expressed by a superposition of orthonormal bases in which each two-level system assumes a basic or an excited state, a quantum gate network is used to perform an operation including a combination of a selective rotation operation and an inversion about average operation D in order to configure a desired partly-entangled quantum mechanical state in which the coefficients of the respective bases are all real numbers.

An image display apparatus which is subjected to getter flashing during manufacturing, for the purpose of increasing the degree of vacuum in the air-tight container thereof, is provided with a getter scattering prevention member comprised of a plurality of getter scattering prevention walls. The getter scattering prevention walls prevent getter material from scattering to the image display portion of the image display apparatus, while allowing for smooth conductance of gas in the air-tight container during evacuation. Thus, evacuation by the getter can be further improved by increasing the area to which getter adheres to, deterioration of the image quality can be prevented by not allowing getter to adhere to the image display portion, the air-tight container can be evacuated in a shorter time, irregularities in brightness of the screen due to uneven pressure within the display portion can be done away with, and a higher degree of vacuum can be attained. Consequently, an image display apparatus with good image quality and a long life expectancy is provided

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Kanagawa, Japan

Hiroo Azuma