Dynamical decoupling design for identifying weakly coupled nuclear spins in a bath

Zhao, Nan; Wrachtrup, Jörg; Liu, Ren‐Bao

doi:10.1103/physreva.90.032319

Cited by 37 publications

(54 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dosage was 10 11 /cm 2 and the estimated average depth of NV was 20 nm. For NV center, the environment was made with dark spin bath 13 C and 14 N. In our work, the former was come from diamond lattice and was the source of slow dephasing noise. And the latter was come from nitrogen implantation, which caused the non-Markovianity of environment for NV center.…”

Section: Methodsmentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15][16] However, quantum superposition and correlation are fragile in an open quantum system. Notorious decoherence, [17][18][19] which is caused by interactions with noisy environments, is a major hurdle in the realization of fault-tolerant coherent operation 20,21 and scalable quantum computation.…”

Section: Introductionmentioning

confidence: 99%

“…To further expand the implementation of QIP in open quantum systems, full understanding and control of environmental interactions are required. 17,[22][23][24] Many techniques have been developed to address this issue, including decoherence-free subspaces, 25 dynamical decoupling (DD) 13,26 and the geometric approach. 27 However, actively utilizing the environmental interactions would represent a significant achievement, compared with passively shielding them.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

et al. 2018

View full text Add to dashboard Cite

The memory effects in non-Markovian quantum dynamics can induce the revival of quantum coherence, which is believed to provide important physical resources for quantum information processing (QIP). However, no real quantum algorithms have been demonstrated with the help of such memory effects. Here, we experimentally implemented a non-Markovianity-assisted highfidelity refined Deutsch-Jozsa algorithm (RDJA) with a solid spin in diamond. The memory effects can induce pronounced nonmonotonic variations in the RDJA results, which were confirmed to follow a non-Markovian quantum process by measuring the non-Markovianity of the spin system. By applying the memory effects as physical resources with the assistance of dynamical decoupling, the probability of success of RDJA was elevated above 97% in the open quantum system. This study not only demonstrates that the non-Markovianity is an important physical resource but also presents a feasible way to employ this physical resource. It will stimulate the application of the memory effects in non-Markovian quantum dynamics to improve the performance of practical QIP.npj Quantum Information (2018) 4:3 ; doi:10.1038/s41534-017-0053-z INTRODUCTION Based on quantum phenomena, such as superposition, correlation and entanglement, quantum information processing (QIP) has provided great advantages over its classical counterpart 1-3 in efficient algorithms, 4,5 secure communication, 6,7 and highprecision metrology. [8][9][10][11][12][13][14][15][16] However, quantum superposition and correlation are fragile in an open quantum system. Notorious decoherence, [17][18][19] which is caused by interactions with noisy environments, is a major hurdle in the realization of fault-tolerant coherent operation 20,21 and scalable quantum computation. To further expand the implementation of QIP in open quantum systems, full understanding and control of environmental interactions are required. 17,[22][23][24] Many techniques have been developed to address this issue, including decoherence-free subspaces, 25 dynamical decoupling (DD) 13,26 and the geometric approach. 27 However, actively utilizing the environmental interactions would represent a significant achievement, compared with passively shielding them.Usually, the interaction of an open quantum system with a noisy environment exhibits memory-less dynamics with an irreversible loss of quantum coherence, that can be described by the Born-Markov approximation. 28 However, because of strong system-environment couplings, structured or finite reservoirs, low temperatures, or large initial system-environment correlations, the dynamics of an open quantum system may deviate substantially from the Born-Markov approximation and follow a non-Markovian process. [28][29][30][31][32] In such a process, the pronounced memory effect, which is the primary feature of a non-Markovian environment, can be used to revive the genuine quantum properties, 28-34 such as quantum coherence and correlations. Consequently, improving the performance of QIP by utilizing memo...

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Since dynamical decoupling (DD) techniques have also been recently employed in noise spectroscopy [82][83][84][85][86][87][88][89], in the wake of our pioneering work [10,11,[13][14][15][16][17][18][19] it is appropriate to compare the two approaches.…”

Section: Comparison Of Bath-optimized Task-oriented Control (Botoc) Tmentioning

confidence: 99%

Quantum Sensing of Noisy and Complex Systems under Dynamical Control

2016

View full text Add to dashboard Cite

Abstract:We review our unified optimized approach to the dynamical control of quantum-probe interactions with noisy and complex systems viewed as thermal baths. We show that this control, in conjunction with tools of quantum estimation theory, may be used for inferring the spectral and spatial characteristics of such baths with high precision. This approach constitutes a new avenue in quantum sensing, dubbed quantum noise spectroscopy.

show abstract

“…This would generally require a larger number of dynamical sensing pulses [24] such that even tiny pulse errors may accumulate and deteriorate significantly the magnetic resonance spectroscopy signal [25][26][27][28][29][30]. Furthermore, the effect of a finite pulse duration, during which the control pulses and the interaction with the nuclei/field simultaneously act on the sensor, leads to spurious higher order resonances in the measurement data that may lead to a misidentification of frequency components in the signal.…”

mentioning

confidence: 99%

Unambiguous nuclear spin detection using an engineered quantum sensing sequence

Shu¹,

Zhang²,

Cao³

et al. 2017

Phys. Rev. A

View full text Add to dashboard Cite

Sensing, localising and identifying individual nuclear spins or frequency components of a signal in the presence of a noisy environments requires the development of robust and selective methods of dynamical decoupling. An important challenge that remains to be addressed in this context are spurious higher order resonances in current dynamical decoupling sequences as they can lead to the misidentification of nuclei or of different frequency components of external signals. Here we overcome this challenge with engineered quantum sensing sequences that achieve both, enhanced robustness and the simultaneous suppression of higher order harmonic resonances. We demonstrate experimentally the principle using a single nitrogen-vacancy center spin sensor which we apply to the unambiguous detection of external protons. Introduction.-The detection of single nuclear spins represents an important yet challenging step towards single molecule magnetic resonance spectroscopy and imaging [1] which holds the promise for the observation of individual protein structures without the need for crystallization of large ensembles. The achievement of this goal may have significant impact on structural biology and medical imaging and may also provide a new tool for the investigation of nuclear spin dynamics in non-trivial quantum biological processes [2,3]. Recently, research has made impressive progress in single nuclear spin detection using various physical platforms [4][5][6][7][8], particularly in the highly challenging task of detecting single spins in external molecules [9][10][11][12][13][14]. Among those physical platforms, a sensor based on individual negatively charged nitrogen-vacancy (NV) centers in diamond [15,16] has demonstrated appealing prospects for applications in biology and medicine, due to its biocompatibility, nano-scale size and long coherence times under ambient conditions [17,18]. NV centers, shallowly implanted to within a few nanometers below the diamond surface, enable strong coupling between NV sensors and target nuclei, thereby promoting the detection sensitivity from a relative large ensemble of nuclei [9,10] to single nuclear spin sensitivity in small clusters of nuclear spins [11][12][13][14]. Besides the interest in single molecule magnetic resonance spectroscopy and imaging, single nuclear spin addressing also has an important role to play in the precise coherent control of nuclear spin qubits, where it may facilitate the realisation of quantum memories with long coherence times and nuclear spin based quantum information processors [19][20][21][22].One ultimate goal of single molecule magnetic resonance spectroscopy using a single spin sensor is to detect a single nuclear spin and further infer the structure of a single molecule

show abstract

Dynamical decoupling design for identifying weakly coupled nuclear spins in a bath

Cited by 37 publications

References 30 publications

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

Non-Markovianity-assisted high-fidelity Deutsch–Jozsa algorithm in diamond

Quantum Sensing of Noisy and Complex Systems under Dynamical Control

Unambiguous nuclear spin detection using an engineered quantum sensing sequence

Contact Info

Product

Resources

About