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Coherent control of a flux qubit by phase-shifted resonant microwave pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic drawings of the measurement circuit. The squares with crosses represent Josephson junctions. Microwaves (MW) were applied to the qubit from the on-chip strip line. (b) Schematic drawings of the phase-shifted double pulse generation. The relative phase shift between two pulses was precisely controlled with two synchronous MW generators and , each MW pulse was reshaped by multiplying with a rectangular pulse from a synchronous driven pulse generator, then a pair of phase-controlled MW pulses were delivered to the sample through a microwave adder. (c) Timing chart of the resonant MW pulses separated by time and a readout dc pulse.

Image of FIG. 2.
FIG. 2.

Schematic diagram of qubit vector motion induced by the phase-shifted double on-resonance pulses . It is described in the rotating frame of the qubit Larmor frequency . (a) The qubit vector in the initial state. The qubit is in the ground state . (b) The first resonant pulse tips the qubit vector to the equator. The qubit vector remains there, because the on-resonance pulse is used. (c) The second resonant pulse, in which the phase shift is introduced, tips the qubit vector on another axis, which is at an angle from the axis.

Image of FIG. 3.
FIG. 3.

On-resonance Ramsey fringes observed by using the phase-shifted double pulse technique. The Larmor frequency is . The width of the pulse, 5 ns, is determined by Rabi oscillation. An exponentially damped sinusoidal curve fitted with the decay time constant is also shown.


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Scitation: Coherent control of a flux qubit by phase-shifted resonant microwave pulses