Experimental proof of quantum Zeno-assisted noise sensing

Do, Hoang-Van; Lovecchio, Cosimo; Mastroserio, Ivana; Fabbri, Nicole; Cataliotti, F. S.; Gherardini, Stefano; Müller, Matthias; Pozza, Nicola Dalla; Caruso, Filippo

doi:10.1088/1367-2630/ab5740

Cited by 34 publications

(26 citation statements)

References 49 publications

(74 reference statements)

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“…If the QNS protocol is sufficiently powerful to characterize the leading correlation functions and matches the model, in principle the inferred information can be plugged into a cumulant expansion or a Dyson series expansion of V O (t) to successfully obtain an estimate of the operator for any choice of f α (t), as desired. This has led to a proliferation of increasingly more powerful QNS protocols, including those capable of characterizing the noise model described here 10 , some of which have even been experimentally verified [1][2][3][4]7,8,13,49,50 . More generally, the idea of optimizing control procedures to a known noise spectrum 22 is behind some of the most remarkable coherence times available in the literature 51 .…”

Section: Introductionmentioning

confidence: 99%

Characterization and control of open quantum systems beyond quantum noise spectroscopy

2020

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The ability to use quantum technology to achieve useful tasks, be they scientific or industry related, boils down to precise quantum control. In general it is difficult to assess a proposed solution due to the difficulties in characterizing the quantum system or device. These arise because of the impossibility to characterize certain components in situ, and are exacerbated by noise induced by the environment and active controls. Here, we present a general purpose characterization and control solution making use of a deep learning framework composed of quantum features. We provide the framework, sample datasets, trained models, and their performance metrics. In addition, we demonstrate how the trained model can be used to extract conventional indicators, such as noise power spectra.

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Section: Introductionmentioning

confidence: 99%

Characterization and control of open quantum systems beyond quantum noise spectroscopy

2020

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“…Driving fields can even effectively remove the interaction of the quantum system with its environment, which is precisely the idea behind dynamical decoupling 56 – 61 . Driving fields have also been recently used in noise sensing 62 .…”

Section: Introductionmentioning

confidence: 99%

The quantum Zeno and anti-Zeno effects with driving fields in the weak and strong coupling regimes

Majeed

Chaudhry

2021

Sci Rep

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Repeated measurements in quantum mechanics can freeze (the quantum Zeno effect) or enhance (the quantum anti-Zeno effect) the time-evolution of a quantum system. In this paper, we present a general treatment of the quantum Zeno and anti-Zeno effects for arbitrary driven open quantum systems, assuming only that the system–environment coupling is weak. In particular, we obtain a general expression for the effective decay rate of a two-level system subjected to arbitrary driving fields as well as periodic measurements. We demonstrate that the driving fields change the decay rate, and hence the quantum Zeno and anti-Zeno behavior, both qualitatively and quantitatively. We also extend our results to systems consisting of more than one two-level system, as well as a two-level system strongly coupled to an environment of harmonic oscillators, to further illustrate the non-trivial effect of the driving fields on the quantum Zeno and anti-Zeno effects.

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“…The interaction of a quantum system with its environment has often a detrimental effect, inducing decoherence and information losses [1]. However, a proper control and design of the system-environment coupling via the combination of coherent and non-unitary operations is a fundamental resource for quantum information processing [2,3], quantum simulation [4], quantum sensing [5][6][7], and quantum thermodynamics [8][9][10]. Dissipative operations-achieved e.g.…”

Section: Introductionmentioning

confidence: 99%

Autonomous dissipative Maxwell's demon in a diamond spin qutrit

Hernández-Gómez,

Gherardini,

Staudenmaier

et al. 2021

Preprint

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Engineered dynamical maps that combine not only coherent, but also unital and dissipative transformations of quantum states, have demonstrated a number of technological applications, and promise to be a beneficial tool also in quantum thermodynamic processes. Here, we exploit control of a spin qutrit to investigate energy exchange fluctuations of an open quantum system. The qutrit engineer dynamics can be understood as an autonomous feedback process, where random measurement events condition the subsequent dissipative evolution. To analyze this dynamical process, we introduce a generalization of the Sagawa-Ueda-Tasaki relation for dissipative dynamics and verify it experimentally. Not only we characterize the efficacy of the autonomous feedback protocol, but also find that the characteristic function of energy variations G(η) becomes insensitive to the process details at a single specific value of its argument. This allows us to demonstrate that a fluctuation theorem of the Jarzynski type holds for this general dissipative feedback dynamics, while previous relations were limited to unital dynamics. Moreover, in addition to the feedback efficacy, we find a witness of unitality associated with the fixed point of the dynamics.

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Experimental proof of quantum Zeno-assisted noise sensing

Cited by 34 publications

References 49 publications

Characterization and control of open quantum systems beyond quantum noise spectroscopy

Characterization and control of open quantum systems beyond quantum noise spectroscopy

The quantum Zeno and anti-Zeno effects with driving fields in the weak and strong coupling regimes

Autonomous dissipative Maxwell's demon in a diamond spin qutrit

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