Assignee: D-Wave Systems, Inc.

Location: Vancouver, CA
No. of patents: 35

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Number	Title	Issue Date
7335909	Superconducting phase-charge qubits A quantum computing structure comprising a superconducting phase-charge qubit, wherein the superconducting phase-charge qubit comprises a superconducting loop with at least one Josephson junction. The quantum computing structure also comprises a first mechanism for ...	02/26/2008
7230266	Conditional Rabi oscillation readout for quantum computing A method for determining whether a first state of a quantum system is occupied is provided. A driving signal is applied to the system at a frequency corresponding to an energy level separation between a first and second state of the system. The system produces a rea...	06/12/2007
7018852	Methods for single qubit gate teleportation A method for performing a single-qubit gate on an arbitrary quantum state. An ancillary qubit is set to an initial state \|I>. The data qubit is coupled to an ancillary qubit. The state of the ancillary qubit is measured, and the data qubit and the ancillary qubit ar...	03/28/2006
6987282	Quantum bit with a multi-terminal junction and loop with a phase shift A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loo...	01/17/2006
6979836	Superconducting low inductance qubit A superconducting structure that can operate, for example, as a qubit or a superconducting switch is presented. The structure includes a loop formed from two parts. A first part includes two superconducting materials separated by a junction. The junction can, for ex...	12/27/2005
6960780	Resonant controlled qubit system A circuit comprising a superconducting qubit and a resonant control system that is characterized by a resonant frequency. The resonant frequency of the control system is a function of a bias current. The circuit further includes a superconducting mechanism having a ...	11/01/2005
6943368	Quantum logic using three energy levels A method for quantum computing with a quantum system comprising a first energy level, a second energy level, and a third energy level. The first energy level and said second energy level are capable of being degenerate with respect to each other. In the method a sig...	09/13/2005
6936841	Methods for controlling qubits A control system for an array of qubits is disclosed. The control system according to the present invention provides currents and voltages to qubits in the array of qubits in order to perform functions on the qubit. The functions that the control system can perform ...	08/30/2005
6930320	Resonant controlled qubit system A method is provided for entangling a quantum state of a qubit with a quantum state of a resonant control system. The method comprises tuning the resonant control system, which is capacitively or inductively coupled to the qubit, to a resonant frequency for a period...	08/16/2005
6919579	Quantum bit with a multi-terminal junction and loop with a phase shift A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loo...	07/19/2005
6911664	Extra-substrate control system The present invention generally involves an extra-substrate control system comprising a first substrate, attached to which is at least one superconducting structure, and a second substrate, connected to which is at least one element of circuitry, wherein the superco...	06/28/2005
6905887	High sensitivity, directional dc-SQUID magnetometer A solid state dc-SQUID includes a superconducting loop containing a plurality of Josephson junctions, wherein an intrinsic phase shift is accumulated through the loop. In an embodiment of the invention, the current-phase response of the dc-SQUID sits in a linear reg...	06/14/2005
6900456	Resonant controlled qubit system A circuit comprising a superconducting qubit and a resonant control system that is characterized by a resonant frequency. The resonant frequency of the control system is a function of a bias current. The circuit further includes a superconducting mechanism having a ...	05/31/2005
6900454	Resonant controlled qubit system A circuit comprising a superconducting qubit and a resonant control system that is characterized by a resonant frequency. The resonant frequency of the control system is a function of a bias current. The circuit further includes a superconducting mechanism having a ...	05/31/2005
6897468	Resonant controlled qubit system Methods for coupling a superconducting qubit to a resonant control circuit. An interaction term between the qubit and the circuit initially has a diagonal component. A recoupling operation is applied to the qubit. The circuit is tuned so that a frequency of the qubi...	05/24/2005
6885325	Sub-flux quantum generator A sub-flux quantum generator includes an N-turn ring having a plurality of connected turns about a common aperture. The width of each respective turn in the N-turn ring exceeds the London penetration depth of a superconducting material used to make the respective tu...	04/26/2005
6822255	Finger SQUID qubit device A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Eac...	11/23/2004
6812484	Finger squid qubit device A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Eac...	11/02/2004
6803599	Quantum processing system for a superconducting phase qubit A control system for an array of qubits is disclosed. The control system according to the present invention provides currents and voltages to qubits in the array of qubits in order to perform functions on the qubit. The functions that the control system can perform ...	10/12/2004
6791109	Finger SQUID qubit device A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Eac...	09/14/2004
6784451	Multi-junction phase qubit In one embodiment, a two-junction phase qubit includes a superconducting loop and two Josephson junctions separated by a mesoscopic island on one side and a bulk loop on another side. The material forming the superconducting loop is a superconducting material with a...	08/31/2004
6753546	Trilayer heterostructure Josephson junctions The present invention comprises a junction between an unconventional superconductor, an intermediate material, and a conventional superconducting material. In some embodiments, the unconventional superconductor has an orthorhombic crystal structure and the supercurr...	06/22/2004
6728131	Fluxon injection into annular Josephson junctions A method for inserting fluxons into an annular Josephson junction is disclosed. Fluxon injection according to the present invention is based on local current injection into one of the superconducting electrodes of the junction. By choosing an appropriate value for t...	04/27/2004
6670630	Quantum phase-charge coupled device A superconducting structure that includes a mesoscopic phase device and a mesoscopic charge device. The superconducting structure further includes a mechanism for coupling the mesoscopic phase device and the mesoscopic charge device so that the quantum st...	12/30/2003
6627916	High sensitivity, directional DC-squid magnetometer A solid state dc-SQUID includes a superconducting loop containing a plurality of Josephson junctions, wherein an intrinsic phase shift is accumulated through the loop. In an embodiment of the invention, the current-phase response of the dc-SQUID sits in a...	09/30/2003
6627915	Shaped Josephson junction qubits A superconducting qubit is presented. The qubit is a shaped long Josephson junction with a magnetic fluxon such that, in the presence of an externally applied magnetic field, a fluxon potential energy function indicating a plurality of pinning sites in th...	09/30/2003
6614047	Finger squid qubit device A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of sai...	09/02/2003
6605822	Quantum phase-charge coupled device A method for performing a quantum computing entanglement operation between a phase qubit and a charge qubit. A coherent connection between the phase qubit and the charge qubit is provided. The coherent connection allows the quantum state of the phase qubi...	08/12/2003
6580102	Four-terminal system for reading the state of a phase qubit Quantum computing systems and methods that use opposite magnetic moment states read the state of a qubit by applying current through the qubit and measuring a Hall effect voltage across the width of the current. For reading, the qubit is grounded to freez...	06/17/2003
6573202	Four-terminal system for reading the state of a phase qubit Quantum computing systems and methods that use opposite magnetic moment states read the state of a qubit by applying current through the qubit and measuring a Hall effect voltage across the width of the current. For reading, the qubit is grounded to freez...	06/03/2003
6563310	Quantum computing method using Josephson junctions between s-wave and d-wave superconductors A solid-state quantum computing structure includes a set of islands that Josephson junctions separate from a first superconducting bank. A d-wave superconductor is on one side of the Josephson junctions (either the islands' side or the bank's side), and a...	05/13/2003
6563311	Quantum computing method using magnetic flux states at a josephson junction A solid-state quantum computing structure includes a d-wave superconductor in sets of islands that clean Josephson junctions separate from a first superconducting bank. The d-wave superconductor causes the ground state for the supercurrent at each junctio...	05/13/2003
6537847	Superconducting dot/anti-dot flux qubit based on time-reversal symmetry breaking effects A method is described for forming a solid state qubit. The method includes forming a dot or an anti-dot. The dot or anti-dot can be formed on a substrate and is delimited by an interface that defines a closed area. The dot or anti-dot includes a supercond...	03/25/2003
6504172	Superconducting dot/anti-dot flux qubit based on time-reversal symmetry breaking effects A solid-state quantum computing structure includes a dot of superconductive material, where the superconductor possesses a dominant order parameter with a non-zero angular momentum and a sub-dominant order parameter that can have any pairing symmetry. Alt...	01/07/2003
6459097	Qubit using a Josephson junction between s-wave and d-wave superconductors A solid-state quantum computing structure includes a set of islands that Josephson junctions separate from a first superconducting bank. A d-wave superconductor is on one side of the Josephson junctions (either the islands' side or the bank's side), and a...	10/01/2002

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Assignee: D-Wave Systems, Inc.