2011/10/30 by Adam Zaman Chaudhry, Jiangbin Gong · 39 citations
Computer Science · Engineering · Physics and Astronomy · #Coupling (piping) #Decoupling (probability) #Dynamical decoupling #Electrical engineering #Engineering #Master equation #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum decoherence #Quantum entanglement #Quantum mechanics #Qubit #Qutrit #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physreva.85.012315
published in Physical Review A 85(1) (American Physical Society) · 16 pages, 6 figures (improved introduction, made connections with early studies of dynamically corrected quantum gates)
arxiv created 2011/10/30 · openalex publication_date 2012/01/18 · arxiv updated 2012/01/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A field configuration utilizing local static fields and a few continuous-wave driving fields is constructed to achieve universal (but low-order) protection of two-qubit states. That is, two-qubit states can be protected against arbitrary system-environment coupling with control fields if their frequencies are sufficiently large as compared with the cutoff frequency of the environment. Equally important, we show that it is possible to construct driving fields to protect two-qubit entangling gates against decoherence, without assuming any particular form of system-environment coupling. Using a non-Markovian master equation, we further demonstrate the effectiveness of our continuous dynamical decoupling fields in protecting entanglement and the excellent performance of protected two-qubit gates in generating entanglement. The results are complementary to current studies of entanglement protection using universal dynamical decoupling pulse sequences.