Characterizing noise correlation and enhancing coherence via qubit motion

Han, Jie; Li, Zhiyuan; Zhang, Jingning; Xu, Huikai; Linghu, Kehuan; Li, Yongchao; Li, Chengyao; Chen, Mo; Yang, Zhen; Wang, Junhua; Ma, Teng; Xue, Guangming; Jin, Yirong; Yu, Haifeng

doi:10.1016/j.fmre.2020.12.005

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…So, the pure dephasing rate can be proportional to ∼ N α , with α = 1 representing non-correlated noise and α = 2 representing correlated noise acting on all qubits. Experimental investigations into noise correlations between two or more superconducting qubits have only recently started to appear [70][71][72] . These results are important for quantum computation and quantumenhanced sensing, and further experiments would be of great value.…”

Section: Adding Entanglementmentioning

confidence: 99%

Quantum sensing with superconducting circuits

Danilin,

Weides

2021

Preprint

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Sensing and metrology play an important role in fundamental science and applications, by fulfilling the ever-present need for more precise data sets, and by allowing to make more reliable conclusions on the validity of theoretical models. Sensors are ubiquitous, they are used in applications across a diverse range of fields including gravity imaging, geology, navigation, security, timekeeping, spectroscopy, chemistry, magnetometry, healthcare, and medicine. Current progress in quantum technologies inevitably triggers the exploration of quantum systems to be used as sensors with new and improved capabilities. This perspective initially provides a brief review of existing and tested quantum sensing systems, before discussing future possible directions of superconducting quantum circuits use for sensing and metrology: superconducting sensors including many entangled qubits and schemes employing Quantum Error Correction. The perspective also lists future research directions that could be of great value beyond quantum sensing, e.g. for applications in quantum computation and simulation.

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Section: Adding Entanglementmentioning

confidence: 99%

Quantum sensing with superconducting circuits

Danilin,

Weides

2021

Preprint

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“…It collapses-in or collapses-out the measured states. Measure of correlation is also very important in quantum gravity [12,13], and characterizing coherence in quantum systems [14].…”

Section: Introductionmentioning

confidence: 99%

A Note on Holevo quantity of $SU(2)$-invariant states

Wang,

Ge,

Fei

et al. 2022

Preprint

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The Holevo quantity and the SU (2)-invariant states have particular importance in quantum information processing. We calculate analytically the Holevo quantity for bipartite systems composed of spin-j and spin-1 2 subsystems with SU (2) symmetry, when the projective measurements are performed on the spin-1 2 subsystem. The relations among the Holevo quantity, the maximal values of the Holevo quantity and the states are analyzed in detail. In particular, we show that the Holevo quantity increases in the parameter region F < F d and decreases in region F > F d when j increases, where F is function of temperature in thermal equilibrium and F d = j/(2j + 1), and the maximum value of the Holevo quantity is attained at F = 1 for all j. Moreover, when the dimension of system increases, the maximal value of the Holevo quantity decreases.

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A Note on Holevo Quantity of SU(2)-invariant States

Wang

Fei

et al. 2022

Int J Theor Phys

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Characterizing noise correlation and enhancing coherence via qubit motion

Cited by 9 publications

References 29 publications

Quantum sensing with superconducting circuits

Quantum sensing with superconducting circuits

A Note on Holevo quantity of $SU(2)$-invariant states

A Note on Holevo Quantity of SU(2)-invariant States

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