Enhancing the Robustness of Dynamical Decoupling Sequences with Correlated Random Phases

Wang, Zhenyu; Casanova, Jorge; Plenio, Martin B.

doi:10.3390/sym12050730

Cited by 11 publications

(7 citation statements)

References 38 publications

(60 reference statements)

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“…Furthermore, our proposed method can be straightforwardly adapted and integrated to advanced and highly-developed optimization packages, e.g., Remote Dressed CRAB (RedCRAB), which is capable of performing closed-loop optimization remotely [79], and has been recently used to experimentally demonstrate the generation of genuine multipartite entanglement in the form of 20-qubit Greenberger-Horne-Zeilinger (GHZ) states with Rydberg atoms [80]. In addition, the capabilities to conveniently optimize gate robustness and prolong the coherence time using XY-8 sequences make the PM method potentially useful for improving the performance of DD techniques under inhomogeneous broadening [81] and quantum sensing experiments [78].…”

Section: Discussionmentioning

confidence: 99%

Quantum optimal control using phase-modulated driving fields

Tian

Liu

et al. 2020

Phys. Rev. A

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Quantum optimal control represents a powerful technique to enhance the performance of quantum experiments by engineering the controllable parameters of the Hamiltonian. However, the computational overhead for the necessary optimization of these control parameters drastically increases as their number grows. We devise a novel variant of a gradient-free optimal-control method by introducing the idea of phase-modulated driving fields, which allows us to find optimal control fields efficiently. We numerically evaluate its performance and demonstrate the advantages over standard Fourier-basis methods in controlling an ensemble of two-level systems showing an inhomogeneous broadening. The control fields optimized with the phase-modulated method provide an increased robustness against such ensemble inhomogeneities as well as control-field fluctuations and environmental noise, with one order of magnitude less of average search time. Robustness enhancement of single quantum gates is also achieved by the phase-modulated method. Under environmental noise, an XY-8 sequence constituted by optimized gates prolongs the coherence time by 50% compared with standard rectangular pulses in our numerical simulations, showing the application potential of our phase-modulated method in improving the precision of signal detection in the field of quantum sensing.

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Section: Discussionmentioning

confidence: 99%

Quantum optimal control using phase-modulated driving fields

Tian

Liu

et al. 2020

Phys. Rev. A

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“…In particular, we implement two approaches for selecting the phase of each DD block. These are, firstly, a scenario where the phase Φ is randomly chosen in each block [48] while, secondly, we consider a situation where the phases of successive DD blocks are correlated in different manners [49]. In our numerical simulations we will incorporate the corrected final time, t FW , that appears as a consequence of using realistic finite-width pulses (notice we introduced t FW in the previous section).…”

Section: Phase-adaptive Pulse Sequencesmentioning

confidence: 99%

“…A further improvement for NMR detection purposes was introduced in Ref. [49]. Here, the phases {Φ s } are chosen such that M s=1 exp (−iΦ s ) = 0 (this is, the phases are correlated).…”

Section: Phase-adaptive Pulse Sequencesmentioning

confidence: 99%

“…In this article we demonstrate that phase-adaptive DD methods, previously introduced in the context of nuclear magnetic resonance [48,49], can be incorporated to trapped-ion systems to achieve significantly enhanced robustness in quantum information processing via spin-spin dynamics. In particu-lar, phase-adaptive DD methods use either random or correlated pulse phases to remove common experimental errors.…”

Section: Introductionmentioning

confidence: 99%

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Phase-adaptive dynamical decoupling methods for robust spin-spin dynamics in trapped ions

Dong,

Arrazola,

Chen

et al. 2020

Preprint

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Quantum platforms based on trapped ions are main candidates to build a quantum hardware with computational capacities that largely surpass those of classical devices. Among the available control techniques in these setups, pulsed dynamical decoupling (pulsed DD) revealed as a useful method to process the information encoded in ion registers, whilst minimising the environmental noise over them. In this work, we incorporate a pulsed DD technique that uses random pulse phases, or correlated pulse phases, to significantly enhance the robustness of entangling spin-spin dynamics in trapped ions. This procedure was originally conceived in the context of nuclear magnetic resonance for nuclear spin detection purposes, and here we demonstrate that the same principles apply for robust quantum information processing in trapped-ion settings.

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“…Fortunately, pulsed DD also offers strategies to mitigate these effects. As an example, the randomisation of pulse phases in DD sequences has been proven useful to average out spurious resonances, while at the same it enhances the robustness of the DD method [87,88]. The natural finite width of the pulses presents other undesired effects, such as the strong reduction of the effective NV-nucleus coupling, that is, the…”

mentioning

confidence: 99%

Dynamical decoupling methods in nanoscale NMR

Munuera-Javaloy,

Puebla,

Casanova

2021

Preprint

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PACS 76.20.+q -General theory of resonances and relaxations PACS 76.30.Mi -Color centers and other defects PACS 76.60.Lz -Spin echoes Abstract -Nuclear magnetic resonance (NMR) schemes can be applied to micron-, and nanometer-sized samples by the aid of quantum sensors such as nitrogen-vacancy (NV) color centers in diamond. These minute devices allow for magnetometry of nuclear spin ensembles with high spatial and frequency resolution at ambient conditions, thus having a clear impact in different areas such as chemistry, biology, medicine, and material sciences. In practice, NV quantum sensors are driven by microwave (MW) control fields with a twofold objective: On the one hand, MW fields bridge the energy gap between NV and nearby nuclei which enables a coherent and selective coupling among them while, on the other hand, MW fields remove environmental noise on the NV leading to enhanced interrogation time. In this work we review distinct MW radiation patterns, or dynamical decoupling techniques, for nanoscale NMR applications.

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Enhancing the Robustness of Dynamical Decoupling Sequences with Correlated Random Phases

Cited by 11 publications

References 38 publications

Quantum optimal control using phase-modulated driving fields

Quantum optimal control using phase-modulated driving fields

Phase-adaptive dynamical decoupling methods for robust spin-spin dynamics in trapped ions

Dynamical decoupling methods in nanoscale NMR

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