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August 22, 2006

Dwave superconducting quantum computer patents

Looks like the first two patents that I list are the most relevant to what they are doing. A series of josephson junction loops. Based on funding and progress I am thinking 32-40 qubits when they release and 100-200 qubits within a year or so after. (just a guess/gut feel from looking at the research papers.)

Multi-junction phase qubit patent quantum computer patent Rose, Geordie.

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 an order parameter that violates time reversal symmetry. In one embodiment, a two-junction phase qubit includes a loop of superconducting material, the loop having a bulk portion and a mesoscopic island portion. The loop further includes a relatively small gap located in the bulk portion. The loop further includes a first Josephson junction and a second Josephson junction separating the bulk portion from the mesoscopic island portion. The superconducting material on at least one side of the first and second Josephson junctions has an order parameter having a non-zero angular momentum in its pairing symmetry. In one embodiment, a qubit includes a superconducting loop having a bulk loop portion and a mesoscopic island portion. The superconducting loop further includes first and second Josephson junctions separating the bulk loop portion from the mesoscopic island portion. The superconducting loop further includes a third Josephson junction in the bulk loop portion. In one embodiment, the third Josephson junction has a Josephson energy relatively larger than a Josephson energy of the first and second Josephson junctions.

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 include read out, initialization, and entanglement. The state of a qubit can be determined by grounding the qubit, applying a current across the qubit, measuring the resulting potential drop across the qubit, and interpreting the potential drop as a state of the qubit. A qubit can be initialized by grounding the qubit and applying a current across the qubit in a selected direction for a time sufficient that the quantum state of the qubit can relax into the selected state. In some embodiments, the qubit can be initialized by grounding the qubit and applying a current across the qubit in a selected direction and then ramping the current to zero in order that the state of the qubit relaxes into the selected state. The states of two qubits can be entangled by coupling the two qubits through a switch. In some embodiments, the switch that is capable of grounding the qubits can also be utilized for entangling selected qubits.

Pregrant abstract

A method of simulating a molecular system using a hybrid computer is provided. The hybrid computer comprises a classical computer and a quantum computer. The method uses atomic coordinates {right arrow over (R)}n and atomic charges Zn of a molecular system to compute a ground state energy of the molecular system using the quantum computer. The ground state energy is returned to the classical computer and the atomic coordinates are geometrically optimized on the classical computer based on information about the returned ground state energy of the atomic coordinates in order to produce a new set of atomic coordinates {right arrow over (R)}?n for the molecular system. These steps are optionally repeated in accordance with a refinement algorithm until a predetermined termination condition is achieved

Superconducting dot/anti-dot flux qubit based on time-reversal symmetry breaking effects

A Business 2.0 feature on Gordie Rose from 2004 He stated a goal of 32 qubits as powerful as a Cray cluster, but now he may be shooting for 36-38 qubits to get up to the best current supercomputers (petaflop MD Grape3)

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