Physics – Quantum Physics
Scientific paper
2007-09-10
New J. Phys. 10 (2008) 033027
Physics
Quantum Physics
Published version. Added references. Corrected minor typos. Added discussion on how the influence of 1/f noise is modeled. 36
Scientific paper
10.1088/1367-2630/10/3/033027
We present theoretical schemes for performing high-fidelity one- and two-qubit pulsed gates for a superconducting flux qubit. The "IBM qubit" consists of three Josephson junctions, three loops, and a superconducting transmission line. Assuming a fixed inductive qubit-qubit coupling, we show that the effective qubit-qubit interaction is tunable by changing the applied fluxes, and can be made negligible, allowing one to perform high fidelity single qubit gates. Our schemes are tailored to alleviate errors due to 1/f noise; we find gates with only 1% loss of fidelity due to this source, for pulse times in the range of 20-30ns for one-qubit gates (Z rotations, Hadamard), and 60ns for a two-qubit gate (controlled-Z). Our relaxation and dephasing time estimates indicate a comparable loss of fidelity from this source. The control of leakage plays an important role in the design of our shaped pulses, preventing shorter pulse times. However, we have found that imprecision in the control of the quantum phase plays the major role in the limitation of the fidelity of our gates.
Brito Frederico
DiVincenzo David P.
Koch Roger H.
Steffen Matthias
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