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 (21)

• Quantum Computation with Quantum Dots
• Quantum state engineering with Josephson-junction devices
• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Decoherence Free Subspaces for Quantum Computation
• Dynamical Decoupling of Open Quantum Systems
• Manipulating the Quantum State of an Electrical Circuit
• Noiseless Quantum Codes
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Quantum Computers and Dissipation
• Complete Characterization of a Quantum Process: the Two-Bit Quantum Gate
• Demonstration of conditional gate operation using superconducting charge qubits
• Preserving coherence in quantum computation by pairing quantum bits
• Quantum Zeno subspaces
• Quantum Computing Using Dissipation to Remain in a Decoherence-Free Subspace
• Floquet-Markov description of the parametrically driven, dissipative harmonic quantum oscillator
• Decoherence and dissipation during a quantum XOR gate operation
• Heating and decoherence suppression using decoupling techniques
• Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator
• Coherence-Preserving Quantum Bits
• Coherence control for qubits
• Selective coherence transfers in homonuclear dipolar coupled spin systems

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