Josephson Junction Qubits with Symmetrized Couplings to a Resonant LC Bus
AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
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The system for quantum computationQC we are proposing is modeled on the ion trap system for QC1 where ion qubits are coupled among themselves through collective oscillations in the ion trap, which plays the role of a resonant bus. The bus for the proposed Josephson junctionJJ prism qubit QC is a single mode LC resonant loop. Magnetic flux from the loop threading a qubit will produce a loop-qubit interaction via the Bohm Aharonov effect. At their preferred operating point, the proposed qubits have negligible circulating persistent currents and are kept by symmetry from interacting with their coupled measurement SQUIDs. By pairing the physical qubits into logical qubits, it is possible to maintain the logical qubits in a decoherence free subspaceDFS that nulls decoherence effects of uniform external flux perturbations, and perturbations associated with computational Molmer Sorensen MS bichromatic gates. The only time a logical qubit should interact with the environment is during unitary gate rotation that initialize qubits, and during final Hadamard rotation, which allows the qubit to interact with the measurement SQUID gradiometer.
- Quantum Theory and Relativity
- Solid State Physics