scholarly journals Method for generating all uniformπ-pulse sequences used in deterministic dynamical decoupling

2015 ◽  
Vol 92 (3) ◽  
Author(s):  
Haoyu Qi ◽  
Jonathan P. Dowling
Keyword(s):  
Pulse Sequences ◽  
Dynamical Decoupling

scholarly journals Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling

2017 ◽  
Vol 118 (13) ◽  
Author(s):  
Genko T. Genov ◽  
Daniel Schraft ◽  
Nikolay V. Vitanov ◽  
Thomas Halfmann
Keyword(s):  
Pulse Sequences ◽  
Dynamical Decoupling

scholarly journals Enhancing the Robustness of Dynamical Decoupling Sequences with Correlated Random Phases

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 730 ◽  
Author(s):  
Zhenyu Wang ◽  
Jorge Casanova ◽  
Martin B. Plenio
Keyword(s):  
Pulse Sequences ◽  
Finite Width ◽  
Signal Distortion ◽  
Dynamical Decoupling ◽  
Quantum Sensing ◽  
Nv Centers

We show that the addition of correlated phases to the recently developed method of randomized dynamical decoupling pulse sequences can improve its performance in quantum sensing. In particular, by correlating the relative phases of basic pulse units in dynamical decoupling sequences, we are able to improve the suppression of the signal distortion due to π pulse imperfections and spurious responses due to finite-width π pulses. This enhances the selectivity of quantum sensors such as those based on NV centers in diamond.

scholarly journals Robust dynamical decoupling

2012 ◽  
Vol 370 (1976) ◽  
pp. 4748-4769 ◽  
Author(s):  
Alexandre M. Souza ◽  
Gonzalo A. Álvarez ◽  
Dieter Suter
Keyword(s):  
Quantum Information ◽  
Pulse Sequences ◽  
Coherence Time ◽  
Quantum Mechanical ◽  
Quantum Computers ◽  
Dynamical Decoupling ◽  
Quantum Bits ◽  
Quantum Mechanical Systems ◽  
Further Development ◽  
Loss Of Coherence

Quantum computers, which process information encoded in quantum mechanical systems, hold the potential to solve some of the hardest computational problems. A substantial obstacle for the further development of quantum computers is the fact that the lifetime of quantum information is usually too short to allow practical computation. A promising method for increasing the lifetime, known as dynamical decoupling (DD), consists of applying a periodic series of inversion pulses to the quantum bits. In the present review, we give an overview of this technique and compare different pulse sequences proposed earlier. We show that pulse imperfections, which are always present in experimental implementations, limit the performance of DD. The loss of coherence due to the accumulation of pulse errors can even exceed the perturbation from the environment. This effect can be largely eliminated by a judicious design of pulses and sequences. The corresponding sequences are largely immune to pulse imperfections and provide an increase of the coherence time of the system by several orders of magnitude.

Evaluation of pulse sequences used for magnetic resonance sialography

2001 ◽  
Vol 30 (5) ◽  
pp. 276-284 ◽  
Author(s):  
M Sakamoto ◽  
T Sasano ◽  
S Higano ◽  
S Takahashi ◽  
T Nagasaka ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Pulse Sequences ◽  
Magnetic Resonance Sialography

Designing Generators of Poisson Pulse Sequences Based on the Additive Fibonacci Generators

2017 ◽  
Vol 49 (12) ◽  
pp. 1-13 ◽  
Author(s):  
Vladimir N. Maksymovych ◽  
Oleg I. Harasymchuk ◽  
Marya N. Mandrona
Keyword(s):  
Pulse Sequences

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

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