Magiq Technologies, Inc.

Mogiq Technologies, Inc.

A Craig Beal

Michael J Lagasse

Audrius Berzanskis

Anton Zavriyev

Caleb A Christensen

Alexei Trifonov

Michael LaGasse

Malcolm Cummings

Mark David Lucas

Keun Lee

Caleb Christensen

Methods and devices for processing a signal. The methods include supplying to a first modulator a first RF signal and a first optical signal, wherein the first modulator is configured to output a first output signal; generating a first intensity signal that is based on the first output signal, wherein the first intensity signal is further based on a first biasing parameter; and providing a first intensity signal to a first analog-to-digital converter (ADC) to create a first digital signal processable by a signal processing unit.

High frequency digitizer and method

A method determines a distance with a specified accuracy. The method transmits to an interferometer a test signal oscillating with a test frequency and receives, in response to the transmitting, an interferometric signal formed by interfering the test signal with a delayed signal produced by delaying a copy of the test signal over the distance equal to a path length difference in the interferometer. The test frequency is varying such that the test signal oscillates with different values of the test frequency. The method determines at least two values of the test frequency corresponding to particular values of the interferometric signal by beating the test signal with a reference signal having a reference frequency, wherein a value of the reference frequency is an absolute value predetermined with the specified accuracy. The method determines the distance using the two values of the test frequency.

Distance measurement by beating a varying test signal with reference signal having absolute frequency value predetermined with a specified accuracy

Disclosed is an optical seismic sensor system for measuring seismic events in a geological formation, including a surface unit for generating and processing an optical signal, and a sensor device optically connected to the surface unit for receiving the optical signal over an optical conduit. The sensor device includes at least one sensor head for sensing a seismic disturbance from at least one direction during a deployment of the sensor device within a borehole of the geological formation. The sensor head includes a frame and a reference mass attached to the frame via at least one flexure, such that movement of the reference mass relative to the frame is constrained to a single predetermined path.

Optical seismic sensor systems and methods

Systems and methods for enhanced quantum key distribution (QKD) using an actively compensated QKD system. The method includes exchanging quantum signals between first and second QKD stations and measuring the quantum signal error. An error signal Srepresentative of the system visibility error is then generated. An error-signal threshold Sthat defines a system visibility error limit is then selected. Those qubits measured with the condition S&#x3e;Sare called 'above-threshold' qubits, while those qubits measured with the condition S&#x2266;Sare called 'below-threshold' qubits. Only below-threshold qubits are stored and used to form the final quantum key. This is accomplished by sending a blanking signal Sto the memory unit where the qubits are stored. The blanking signal prevents above-threshold qubits from being stored therein. The raw quantum key so formed has few errors and thus forms a longer final quantum key for a given number of exchanged quantum signals.

Systems and methods for enhanced quantum key formation using an actively compensated QKD system

Systems and methods for transmitting quantum and classical signals over an optical network are disclosed, wherein the quantum signal wavelength either falls within the classical signal wavelength band, or is very close to one of the classical signal wavelengths. The system includes a deep-notch optical filter with a blocking bandwidth that includes the quantum signal wavelength but not any of the classical signal wavelengths. The deep-notch optical filtering is applied to the classical signals prior to their being multiplexed with the quantum signals to prevent noise generated by the classical signals from adversely affecting transmission of quantum signals in the transmission optical fiber. Narrow-band filtering is also applied to the quantum signals prior to their detection in order to substantially exclude spurious non-quantum-signal wavelengths that arise from non-linear effects in the optical fiber. The present invention allows for the quantum and classical signals to have wavelengths within just a few nanometers of one another, which has benefits for both classical and quantum signal transmission on a common transmission optical fiber.

Systems and methods for transmitting quantum and classical signals over an optical network

An optical fiber interferometer () with relaxed loop tolerance, and a quantum key distribution (QKD) system () using same is disclosed. The interferometer includes two optical fiber loops (LPand LP). The loops have an optical path length (OPL) difference between them. A polarization-maintaining (PM) optical fiber section () of length (L) and having fast and slow optical axes (Aand A) optically couples the two loops. The length and fast-slow axis orientation is selected to introduce a time delay (&#x394;T) between orthogonally polarized optical pulses traveling therethrough that compensates for the OPL difference. This allows for drastically relaxed tolerances when making the loops, leading to easier and more cost-effective manufacturing of the interferometer as well as related devices such as a optical-fiber-based QKD system.

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Watertown, MA, United States of America

A Craig Beal