A system for determining a stuck point of a pipe positioned within a wellbore includes a tubular housing and a sensor array positioned within the tubular housing. The system also includes ferromagnetic flux collectors and flux concentrators on either side of the sensor array. The flux collectors collect a magnetic flux that has been written to a portion of pipe. The flux concentrators intensify the flux to improve measurements of the flux that are acquired by the sensor array.

One example includes a superconducting latch system. The system includes a first input stage configured to receive a first input pulse and a second input stage configured to receive a second input pulse. The system also includes a storage loop configured to switch from a first state to a second state in response to receiving the first input pulse, and to switch from the second state to the first state in response to the second input pulse. The first state corresponds to no flux in the storage loop and the second state corresponds to a flux in the storage loop. The system further includes an output stage configured to generate an output pulse in the second state of the storage loop.

The present disclosure relates to Superfluid QUantum Interference Devices (SQUIDs) that measure phase differences existing in quasi-particles or matter-wave systems, and the related techniques for their use at room-temperatures. These Bose-Einstein Condensation interferometry techniques include quantum scale metrology devices such as quasi-particle based linear accelerometers, gyroscopes, and Inertial Measurement Units that incorporate such interferometers. In the presence of additive white Gaussian noise, estimates are made for the Bias Instability, Angle Random Walk, and Velocity Random Walk of the device for purposes of quantum inertial sensing. Moreover, this disclosure relates to SQUIDs based on charged quasi-particles that can, in turn, be used to construct quantum computing elements such as quantum transistors, and quasi-particle circuits at room-temperatures. These quasi-particle circuits can be used to build analogs of electronic circuit elements, and offer an alternative to traditional electronics. Using a quasi-particle circuit, hysteresis can be achieved and controlled to build these new devices.

This disclosure relates to fabrication of step edges to fabricate Josephson junctions. A method comprises forming a layer of resist over the surface. The layer of resist comprises openings to expose a selected area of the surface, thereby forming two walls in the layer of resist on a perimeter of the selected area. The resist and the substrate are exposed to an ion beam, thereby etching the resist and the exposed areas of the surface. While exposing the resist and the substrate to the ion beam, the substrate is gradually rotated about an axis normal to the surface to thereby form two step edges at the respective two walls. Further, superconducting material is deposited onto the substrate in a meandering shape to form a path that crosses the two step edges multiple times and to form a Josephson junction each time the path crosses the step edges.

A magnetic field concentrating or guiding device can include one or more coils, and one or more foil, tape and/or bulk superconductor structures disposed in one or more predetermined positions With relation to the coils. The one or more superconductor structures can form one or more magnetic field carrying regions. During operation, current passing through the one or more coils can generate one or more magnetic fields that are compressed or guided in the magnetic field carrying regions.

A magnetic field concentrating or guiding device can include one or more coils, and one or more foil, tape and/or bulk superconductor structures disposed in one or more predetermined positions With relation to the coils. The one or more superconductor structures can form one or more magnetic field carrying regions. During operation, current passing through the one or more coils can generate one or more magnetic fields that are compressed or guided in the magnetic field carrying regions.

This disclosure relates to Superconducting Quantum Interference Apparatuses, such as SQUID arrays and SQUIFs. A superconducting quantum interference apparatus comprises an array of loops each loop constituting a superconducting quantum interference device. The array comprises multiple columns, each of the columns comprises multiple rows connected in series, each of the multiple rows comprises a number of loops connected in parallel, and the number of loops connected in parallel in each row is more than two and less than 20 to improve a performance of the apparatus. It is an advantage that keeping the number of loops in parallel below 20 improves the performance of the apparatus. This is contrary to existing knowledge where it is commonly assumed that a larger number of parallel loops would increase performance.

A magnetic field measuring element includes a Superconducting QUantum Interference Device magnetic sensors, the first sensor disposed either on a second plane perpendicular to a first plane including a coil surface of the third sensor and which includes the center of the third sensor, or in the vicinity of the second plane, and a second sensor disposed either on a third plane perpendicular to the first plane and the second plane, or in the vicinity of the third plane. The center of the first sensor is present either on a straight line which passes through the center of the third sensor and is perpendicular to the first plane, or in the vicinity of said straight line, and the center of the second sensor is present in a position displaced from a line joining the center of the third sensor and the center of the first sensor.

The invention relates to a method for determining the component of a magnetic field in a predetermined direction. The method comprises preparing a quantum system in a coherent superposition state (S1), letting the quantum system evolve for a delay time period (S2) and performing a readout operation and a projective measurement on the quantum system (S3). The steps (S1, S2, S3) are iteratively repeated in an iteration loop, wherein the delay time period increases linearly by the same time increment after each iteration. The method further comprises determining the component of the magnetic field in the predetermined direction according to the outcome of the projective measurements (S4).

A system for determining a stuck point of a pipe positioned within a wellbore includes a tubular housing and a sensor array positioned within the tubular housing. The system also includes ferromagnetic flux collectors and flux concentrators on either side of the sensor array. The flux collectors collect a magnetic flux that has been written to a portion of pipe. The flux concentrators intensify the flux to improve measurements of the flux that are acquired by the sensor array.