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

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arxiv cond-mat/0501592 v1 pith:PNTAPH4E submitted 2005-01-25 cond-mat.mes-hall cond-mat.supr-con

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

Tatsuya Kutsuzawa , Shiro Saito , Hirotaka Tanaka , Hayato Nakano , Kouichi Semba , Hideaki Takayanagi This is my paper
classification cond-mat.mes-hall cond-mat.supr-con
keywords qubitmicrowavepulsesarbitrarycoherentcontrolfluxmethod
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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