Noise sensing via stochastic quantum Zeno

Müller, Matthias; Gherardini, Stefano; Pozza, Nicola Dalla; Caruso, Filippo

doi:10.1016/j.physleta.2020.126244

Cited by 19 publications

(13 citation statements)

References 43 publications

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“…[46] Finally, in a more far perspective, quantum methods of noise reduction can be applied. [174][175][176][177] In addition to the NV-density and diamond sample engineering, the sensitivity can be improved by implementing the specific experimental technique based on laser and microwave pulses of particular duration, described in Section 2.2.1.…”

Section: Techniques For Improving Odmr Sensitivitymentioning

confidence: 99%

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Is a Quantum Biosensing Revolution Approaching? Perspectives in NV‐Assisted Current and Thermal Biosensing in Living Cells

et al. 2020

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Understanding the human brain is one of the most significant challenges of the 21st century. As theoretical studies continue to improve the description of the complex mechanisms that regulate biological processes, in parallel numerous experiments are conducted to enrich or verify these theoretical predictions also with the aim of extrapolating more accurate models. In the fields of magnetometry and thermometry, among the various sensors proposed for biological application, nitrogen-vacancy (NV) centers are emerging as a promising solution due to their perfect biocompatibility and the possibility of being positioned in close proximity to the cell membrane, thus allowing a nanometric spatial resolution down to the nano-scale. Still many issues must be overcome to obtain either a sensitivity capable of revealing the very weak electromagnetic fields generated by neurons (or other excitable cells) during their firing activity or a spatial resolution sufficient to measure intracellular thermal gradient due to biological processes. However, over the last few years, significant improvements have been achieved in this direction, thanks to the use of innovative techniques. In this review, the new results regarding the application of NV centers will be analyzed and the main challenges that must be afforded for leading to practical applications will be discussed.

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Section: Techniques For Improving Odmr Sensitivitymentioning

confidence: 99%

“…[ 46 ] Finally, in a more far perspective, quantum methods of noise reduction can be applied. [ 174–177 ]…”

Section: Techniques For Improving Odmr Sensitivitymentioning

confidence: 99%

Is a Quantum Biosensing Revolution Approaching? Perspectives in NV‐Assisted Current and Thermal Biosensing in Living Cells

et al. 2020

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“…If we consider additional dephasing, i.e. a contribution acting on σ z , it can be shown that this gives only a fourth order contribution to the survival probability and can thus be neglected [44]. While the system evolves, we apply a sequence of N measurements separated by a time interval of τ.…”

Section: Sensing Scheme In the Wqz Regimementioning

confidence: 99%

Experimental proof of quantum Zeno-assisted noise sensing

Lovecchio

Mastroserio

et al. 2019

New J. Phys.

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In the ideal quantum Zeno (QZ) effect, repeated quantum projective measurements can freeze the coherent dynamics of a quantum system. However, in the weak QZ regime, measurement backactions can allow the sensing of semi-classical field fluctuations. In this regard, we theoretically show how to combine the controlled manipulation of a quantum two-level system, used as a probe, with a sequence of projective measurements to have direct access to the noise correlation function. We experimentally test the effectiveness of the proposed noise sensing method on a properly engineered Bose-Einstein condensate of Rb 87 atoms realized on an atom chip. We believe that our QZ-based approach can open a new path towards novel quantum sensing devices.

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“…perform a sequence of measurements after preparing it in desired initial state-a more often encountered situation is when we can coherently control and projectively measure a smaller quantum systema probe P -that is interacting with a larger and not directly accessible S. For example, qubits undergoing pure dephasing due to interaction with their environment (the system of interest) can be used as probes of dynamics of S when they are subjected to appropriate unitary driving (see e.g. [25,26] and references therein), or when subjected to a sequence of measurements [27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Statistics of projective measurement on a quantum probe as a witness of noncommutativity of algebra of a probed system

Sakuldee¹,

Cywiński²

2021

Preprint

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We consider a quantum probe P undergoing pure dephasing due to its interaction with a quantum system S. The dynamics of P is then described by a well-defined sub-algebra of operators of S, i.e. the "accessible" algebra on S from the point of view of P. We consider sequences of n measurements on P, and investigate the relationship between Kolmogorov consistency of probabilities of obtaining sequences of results with various n, and commutativity of the accessible algebra. For a finitedimensional S we find conditions under which the Kolmogorov consistency of measurement on P, given that the state of S can be arbitrarily prepared, is equivalent to the commutativity of this algebra. These allow us to describe witnesses of non-classicality (understood here as noncommutativity) of part of S that affects the probe. For P being a qubit, the witness is particularly simple: observation of breaking of Kolmogorov consistency of sequential measurements on a qubit coupled to S means that the accessible algebra of S is non-commutative.

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Noise sensing via stochastic quantum Zeno

Cited by 19 publications

References 43 publications

Is a Quantum Biosensing Revolution Approaching? Perspectives in NV‐Assisted Current and Thermal Biosensing in Living Cells

Is a Quantum Biosensing Revolution Approaching? Perspectives in NV‐Assisted Current and Thermal Biosensing in Living Cells

Experimental proof of quantum Zeno-assisted noise sensing

Statistics of projective measurement on a quantum probe as a witness of noncommutativity of algebra of a probed system

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