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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Protecting quantum resources via frequency modulation of qubits in leaky cavities
Ali Mortezapour1, Rosario Lo Franco2,3
1Department of Physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran. mortezapour@guilan.ac.ir.
Scientific Reports
|September 26, 2018
Summary
Researchers developed a frequency modulation technique to significantly extend quantum resource lifetimes in open systems. This method inhibits qubit decay, preserving coherence and entanglement for quantum technologies.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Condensed Matter Physics
Background:
- Preserving quantum resources in open systems is crucial for advancing quantum technologies.
- Decoherence and environmental noise degrade quantum states, limiting device performance.
- Effective strategies against decoherence are essential for reliable quantum computation and communication.
Purpose of the Study:
- To investigate frequency modulation as a control technique for preserving quantum resources in open systems.
- To determine optimal modulation parameters and qubit-cavity coupling for enhancing coherence lifetimes.
- To assess the scalability and feasibility of the proposed method for multiple qubits and its application in circuit-Quantum Electrodynamics (cQED) architectures.
Main Methods:
- Studying a single qubit within a lossy cavity under frequency modulation.
- Analyzing qubit-cavity coupling regimes and their impact on coherence.
- Investigating the role of effective decay rate inhibition versus non-Markovianity.
- Extending the analysis to a system of noninteracting qubits in separated cavities.
- Discussing implementation within the circuit-QED framework.
Main Results:
- Achieved a four-orders-of-magnitude increase in coherence lifetimes for a single qubit.
- Demonstrated that enhanced lifetimes result from inhibiting the effective decay rate.
- Showed that modulation parameters extend lifetimes of entanglement, discord, and coherence by three orders of magnitude for multiple qubits.
- Identified optimal modulation parameters and coupling regimes for decoherence suppression.
Conclusions:
- Frequency modulation is an effective strategy for preserving quantum resources against decoherence.
- The method offers significant improvements in coherence and entanglement lifetimes, crucial for quantum technologies.
- The approach is scalable and potentially feasible within current circuit-QED architectures, paving the way for robust quantum devices.
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