Coherence stabilization of a two-qubit gate by AC fields

Abstract

We consider a CNOT gate operation under the influence of quantum bit-flip noise and demonstrate that ac fields can change bit-flip noise into phase noise and thereby improve coherence up to several orders of magnitude while the gate operation time remains unchanged. Within a high-frequency approximation, both purity and fidelity of the gate operation are studied analytically. The numerical treatment with a Bloch-Redfield master equation confirms the analytical results.

4 pages, 2 figures

References in corpus (3)

• Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator
• Coherence control for qubits
• Selective coherence transfers in homonuclear dipolar coupled spin systems

Cited by in corpus (6)

• Quantum information processing with circuit quantum electrodynamics
• Limitation of entanglement due to spatial qubit separation
• Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits
• Universal Dephasing Control During Quantum Computation
• Effect of system level structure and spectral distribution of the environment on the decoherence rate
• Improving the purity of one- and two-qubit gates by AC fields