Storing entanglement of nuclear spins via Uhrig Dynamical Decoupling

Abstract

Stroboscopic spin flips have already been shown to prolong the coherence times of quantum systems under noisy environments. Uhrig's dynamical decoupling scheme provides an optimal sequence for a quantum system interacting with a dephasing bath. Several experimental demonstrations have already verified the efficiency of such dynamical decoupling schemes in preserving single qubit coherences. In this work we describe the experimental study of Uhrig's dynamical decoupling in preserving two-qubit entangled states using an ensemble of spin-1/2 nuclear pairs in solution state. We find that the performance of odd-order Uhrig sequences in preserving entanglement is superior to both even-order Uhrig sequences and periodic spin-flip sequences. We also find that there exists an optimal length of the Uhrig sequence at which the decoherence time gets boosted from a few seconds to about 30 seconds.

6 pages, 7 figures

References in corpus (10)

• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Optimized Dynamical Decoupling in a Model Quantum Memory
• How to Enhance Dephasing Time in Superconducting Qubits
• Extending Quantum Coherence in Diamond
• Optimal Dynamical Decoherence Control of a Qubit
• Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit
• Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
• Performance comparison of dynamical decoupling sequences for a qubit in a rapidly fluctuating spin-bath
• Concatenated Control Sequences based on Optimized Dynamic Decoupling
• Process tomography of dynamical decoupling in a dense optically trapped atomic ensemble

Cited by in corpus (16)

• Experimental on-demand recovery of entanglement by local operations within non-Markovian dynamics
• Preserving entanglement and nonlocality in solid-state qubits by dynamical decoupling
• Decoherence control: Universal protection of two-qubit states and two-qubit gates using continuous driving fields
• Evolution of Quantum Discord and its Stability in Two-Qubit NMR Systems
• Experimentally freezing quantum discord in a dissipative environment using dynamical decoupling
• Time-Invariant Discord in Dynamically Decoupled Systems
• Controlling NMR spin systems for quantum computation
• Stabilizing two-qubit entanglement with dynamically decoupled active feedback
• Engineered Decoherence: Characterization and Suppression
• Experimental protection of arbitrary states in a two-qubit subspace by nested Uhrig dynamical decoupling
• High-fidelity two-qubit gates via dynamical decoupling of local 1/f noise at optimal point
• Dynamical Decoupling in Common Environment
• Frozen and Invariant Quantum Discord under Local Dephasing Noise
• Nuclear Spins as Quantum Testbeds: Singlet States, Quantum Correlations, and Delayed-choice Experiments
• Protection of noisy multipartite entangled states of superconducting qubits via universally robust dynamical decoupling schemes
• Generation and Detection of Quantum Correlations and Entanglement on a Spin-Based Quantum Information Processor