Semiconductor adiabatic qubits
| DWPI Title: Quantum computing apparatus for use in refrigerator, has circuitry for reading out values from semiconductor adiabatic qubits comprising states that are collectively indicative of solution to optimization problem represented by Hamiltonian |
| Abstract: A quantum computing device that includes a plurality of semiconductor adiabatic qubits is described herein. The qubits are programmed with local biases and coupling terms between qubits that represent a problem of interest. The qubits are initialized by way of a tuneable parameter, a local tunnel coupling within each qubit, such that the qubits remain in a ground energy state, and that initial state is represented by the qubits being in a superposition of |0> and |1> states. The parameter is altered over time adiabatically or such that relaxation mechanisms maintain a large fraction of ground state occupation through decreasing the tunnel coupling barrier within each qubit with the appropriate schedule. The final state when tunnel coupling is effectively zero represents the solution state to the problem represented in the |0> and |1> basis, which can be accurately read at each qubit location. |
| Use: Quantum computing apparatus for use in a refrigerator. |
| Advantage: The semiconductor qubits are associated with relatively large energy gaps such that excitation caused by noise can be insufficient to cause the semiconductor qubit to leave a ground state, thus preventing errors from overwhelming computation. The apparatus achieves greater speed-ups when speed of operation of single qubits does not need to be quicker than classical transistor speeds. |
| Novelty: The apparatus has a set of semiconductor adiabatic qubits comprising states that are collectively indicative of solution to optimization problem represented by a Hamiltonian, where relative voltage between first and second electrodes (200) is varied in time to control a magnitude of first parameter, where the first parameter is amount of tunnel coupling between the semiconductor qubit and a neighboring qubit in the qubits, and voltages on third and fourth electrodes control a magnitude of second parameter. A circuitry reads out values from the qubits that are indicative of the states. |
| Filed: 10/15/2013 |
| Application Number: US14054659A |
| Tech ID: SD 12390.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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