Coherent control of a flux qubit by phase-shifted resonant microwave pulses
arXiv:cond-mat/0501592 · doi:10.1063/1.2010610
Abstract
The quantum state of a flux qubit was successfully pulse-controlled by using a resonant microwave. We observed Ramsey fringes by applying a pair of phase-shifted pi/2 microwave pulses without introducing detuning. With this method, the qubit state can be rotated on an arbitrary axis in the x-y plane of the Bloch sphere in a rotating frame. We obtained a qubit signal from a coherent oscillation with an angular velocity of up to 2pi*11.4 Grad/s. In combination with Rabi pulses, this method enables us to achieve full control of single qubit operation. It also offers the possibility of orders of magnitude increases in the speed of the arbitrary unitary gate operation.
arXiv comment3 pages, 3 figures
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- Theory of measurement crosstalk in superconducting phase qubits
- Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit
- Detection of Geometric Phases in Flux Qubits with Coherent Pulses
- Enhanced energy relaxation process of quantum memory coupled with a superconducting qubit
- Analysis of measurement errors for a superconducting phase qubit
- Investigation of resonant and transient phenomena in Josephson junction flux qubits
- Simulating Ramsey-Type Fringes in a Pulsed Microwave-Driven Classical Josephson Junction
- Classical analogs for Rabi-oscillations, Ramsey-fringes, and spin-echo in Josephson junctions
- Voltage-Controlled Berry Phases in Two Coupled Quantum Dots
- Static flux bias of a flux qubit using persistent current trapping