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8180186 |
Optical switches and logic gates employing same
An optical switch including a light passageway having a changeable cross-sectional area, an activation light responsive piezoelectric element associated with the light passageway, the activation...
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8149488 |
Method of operating a reconfigurable and integrable optical logic gate based on a single SOA
An optical logic gate (10) comprising inputs (12) for optical signals on which to perform a chosen logical operation. An SOA (11) element receives such input signals to be piloted thereby in...
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8090558 |
Optical parametric model optimization
A method is presented for selecting the order in which parameters are evaluated for inclusion in a model of a film stack, which is by ranking them according to measurement precision. Further, a...
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8081361 |
Carbon nanotube signal modulator and photonic transmission device
The present invention contemplates a variety of methods and techniques for fabricating a carbon nanotube (CNT) signal modulator for reducing, eliminating, or enhancing the resonance interaction...
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8009937 |
Charge-based memory cell for optical resonator tuning
An optical resonator configured to be tuned using a charge-based memory cell includes an optical cavity configured to transmit light and receive injected charge carriers; a charge-based memory cell...
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8004734 |
Optical logic devices having polarization-based logic level representation and method of designing the same
Apparatus and methods for implementing logical operations using polarization-based logic level representation is provided. An apparatus and method split an input polarized beam into a first beam...
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7924498 |
System and method for optical communication using polarization filtering
An optical circuit is described which may include an SOA-MZI circuit providing an output signal; and a polarization filtering device (PFD) configured to receive the output signal of the SOA-MZI and...
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7925131 |
Optical logic gate
An optical logic gate (10) comprises: first and second optical inputs (11, 12) for receiving respective optical signals (A, B) and an optical output (15) for outputting an optical signal (Pout)...
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7920704 |
Systems and methods for obtaining information on a key in BB84 protocol of quantum key distribution
Systems and methods for obtaining information on a key in the BB84 (Bennett-Brassard 1984) protocol of quantum key distribution are provided. A representative system comprises a quantum...
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7907316 |
Optical logic device for processing optical signals
An optical logic device has a first mirror confronting a second mirror, and a saturable absorber located between the mirrors. Radiation that is output from the device is output via the first...
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7876483 |
Optically reconfigurable logic circuit
To provide an optically reconfigurable logic circuit in which a mount area of an optical circuit is reduced as much as possible and a high gate density is realized. In an optically reconfigurable...
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7869107 |
Optical circuit for comparing two N-bit binary words
An optical comparator circuit includes a first stage including an optical gate which receives the signals applied to the two inputs and produces at its output an N bit signal with each bit being...
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7831117 |
N-nary optical semiconductor transistor and an optical AND-gate
An N-nary photonic transistor (PT) based on a heterojunction optical semiconductor microstructure is presented. The PT has one control signal input, one data signal input, and one output. The...
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7826115 |
Quantum computing method and quantum computer
An (N+1) number of physical systems each having five energy levels |0>, |1>, |2>, |3>, and |4>, a qubit being expressed by |0> and |1>, are provided in an optical cavity having a cavity mode...
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7791052 |
Single-photon generation apparatus and quantum bit reading apparatus and method
A method of generating a single photon, includes preparing an optical resonator including a resonator mode of a resonance angular frequency ωc, preparing a material contained in the optical ...
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7791780 |
Quantum coherent systems and operations
Nonlinear elements can efficiently implement quantum information processing systems such as controlled phase shifters, non-absorbing detectors including parity detectors, quantum subspace...
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7791781 |
Rapidly reconfigurable all-optical universal logic gate
A new reconfigurable cascadable all-optical on-chip device is presented. The gate operates by combining the Vernier effect with a novel effect, the gain-index lever, to help shift the dominant...
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7755821 |
Photon logic gates
A system, method, and apparatus for photon logic gates based on quantum switch, where a single or multiple quantum switches are utilized for dark resonance interactions in which three-color lasers...
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7720339 |
All-optical logic gates using nonlinear elements—claim set V
An all-optical logic gates comprises a nonlinear element such as an optical resonator configured to receive optical input signals, at least one of which is amplitude-modulated to include data. The...
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7689081 |
All-optical logic gates using nonlinear elements claim—set V
An all-optical logic gates comprises a nonlinear element such as an optical resonator configured to receive optical input signals, at least one of which is amplitude-modulated to include data. The...
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7684708 |
All-optical flip-flop and control methods thereof
Embodiments of the invention pertain to remote optical control of holding beam-type, optical flip-flop devices, as well as to the devices themselves. All-optical SET and RE-SET control signals...
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7554707 |
Method and apparatus for optical processing
An optical logic circuit is disclosed. The optical logic circuit is configured on a substrate of a first material. The optical logic circuit also has an optical layer which overlays the substrate...
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7518796 |
Optical device having nonmonotonic transfer function and applications using same
An entirely passive all-optical device, referred to as an optical hard limiter, includes alternating layers of materials having oppositely signed Kerr coefficients and substantially different...
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7512237 |
Encryption for optical communications using dynamic subcarrier multiplexing
A multiplexing technique for optical communications used to create a pseudo-random communications signal in the optical domain such that only the sender and/or receiver can decode the signal. The...
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7480319 |
Optical switches and logic and methods of implementation
Optical switches and logic devices comprising microstructure-doped nanocavity lasers are described. These switches and logic devices have gain and thus can be cascaded and integrated in a network...
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7426444 |
Methods for determining relative phase differences in entangled quantum states
Various embodiments of the present invention are directed to methods for determining a phase shift acquired by an entangled N-qubit system represented by a NOON state. In one embodiment, a probe...
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7408235 |
Quantum coherent switch utilizing commensurate nanoelectrode and charge density periodicities
A quantum coherent switch having a substrate formed from a density wave (DW) material capable of having a periodic electron density modulation or spin density modulation, a dielectric layer formed...
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7388703 |
Optical transmission device and optical phase modulator
An optical transmission device includes an optical phase modulator and a signal generation function. The optical phase modulator is controlled, so that when the state of an intensity-modulated...
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7359101 |
Tests of quantum information
Quantum testing can compare unknown photon states in a manner suitable for a validation check of a quantum digital signature, testing of the operation of a quantum gate, or detecting of...
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7355769 |
Method and apparatus for single-photon source and quantum memory
An optical switch and optical storage loop are used as the basis of a single-photon source and a quantum memory for photonic qubits. To operate as a single-photon source, the techniques include a...
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7254304 |
Devices and techniques for logical processing
The invention is directed to apparatus, methods, systems and computer programs which permit a simplification or reduction of the description of a complex digital circuit. This is accomplished by...
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7248400 |
Embodying equipment and method for an all-optical or logic gate by using single SOA
Disclosed herein is an apparatus and method for implementing an all-optical OR logic gate. The apparatus includes an optical pulse generator, a Mode-Locked Fiber Laser (MLFL), a first optical...
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7180645 |
Quantum-state-generating apparatus, Bell measurement apparatus, quantum gate apparatus, and method for evaluating fidelity of quantum gate
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...
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7133173 |
Nonlinear electromagnetic quantum information processing
Nonlinear electromagnetic elements can efficiently implement quantum information processing tasks such as controlled phase shifts, non-demolition state detection, quantum subspace projections,...
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7130093 |
Optical implementation of bounded non-deterministic Turing Machines
Method and an optical computation device for obtaining an indication about the existence of a feasible solution for a bounded instance of a problem that belongs to the non-deterministic polynomial...
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7126731 |
Optical latch based on lasing semiconductor optical amplifiers
An optical latch based on a lasing semiconductor optical amplifier is disclosed. The optical latch is configured to achieve one or more stable states in response to the input of predetermined...
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7126106 |
Quantum computer and quantum computation method
Quantum computer includes optical systems arranged in series each of the plurality of optical systems includes first half-wave plate, first polarizing beam splitter, first switching mirror, first...
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7123407 |
Apparatus and method for realizing all-optical NOR logic device using gain saturation characteristics of a semiconductor optical amplifier
The present invention relates to an apparatus and a method for realizing all-optical NOR logic device using the gain saturation characteristics of a semiconductor optical amplifier(SOA). More...
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7113329 |
Optical logical circuits based on lasing semiconductor optical amplifiers
This disclosure is concerned with digital optical circuits, including an optical astable multivibrator. In one example, an optical astable multivibrator is provided that includes a lasing...
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7085029 |
Dynamic phase logic gate
A logic device for use with data signals having a continuously or semi-continuously varying waveform of substantially fixed frequency. The device provides a logical output from at least one of the...
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7081979 |
Bit differential processing
There is provided an apparatus for processing a segment of x optical bit slots from a packet comprising y optical bit slots, each bit slot defining a respective one of first and second...
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6995404 |
Techniques for quantum processing with photons and the zeno effect
Techniques are provided that use the quantum Zeno effect to implement practical devices that use single photons as the qubits for quantum information processing. In the quantum Zeno effect, a...
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6990281 |
All optical logic gates
An optical AND logic gate includes a summing gate having first and second inputs for receiving first and second optical signals, and a threshold device. The gate produces an output corresponding to...
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6987607 |
Optical AND gate and waveform shaping device
The method according to the present invention includes the steps of inputting an optical signal having a first wavelength and probe light having a second wavelength different from the first...
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6963677 |
Optical memory and logic using cross-switches
An all-optical, asynchronous binary storage cell implemented by optically induced total internal reflection cross-junction waveguide switches. The term “all-optical” refers to directing of opt...
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6930826 |
All-optical XOR gate by using semiconductor optical amplifiers
The present invention relates to a method of embodying all-optical XOR logic gate by using semiconductor optical amplifier, and more particularly, to a technique to embody all-optical XOR logic...
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6917739 |
Optical cache memory
An optical memory having an input port for receiving an input optical signal to be stored in the optical memory is disclosed. A portion of the optical signal is coupled to a storage loop for...
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6859576 |
Optical cross-connect system
An optical cross-connect system is disclosed that use reduces the number of AWGs (Arrayed-Waveguide Grating) as compared to prior art systems so that the hardware complexity is reduced while...
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6853765 |
MEMS optical switch with thermal actuator
A MEMS type optical switch includes a substrate, the substrate including at least one groove formed therein; first and second optical fibers disposed in the at least one groove, the at least one...
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6834135 |
Optical switching system
An optical switching system that switches the output port of an optical signal as indicated by address information (a label) that is contained in optical data packets constituting the optical...
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