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Quantum 2.0 Conference and Exhibition

Experimental quantum noise sensing via quantum Zeno/anti-Zeno effect

Salvatore Virzì, Laura T. Knoll, Fabrizio Piacentini, Alessio Avella, Stefano Gherardini, Tomáš Opatrný, Abraham G. Kofman, Gershon Kurizki, Marco Gramegna, Filippo Caruso, Ivo Pietro Degiovanni, Marco Genovese

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We introduce and experimentally demonstrate two techniques allowing to extract information on the noise affecting single-photon probes propagating in a quantum channel, by exploiting quantum Zeno and anti-Zeno effects.
DOI
10.1364/quantum.2024.qth4c.4

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이중성

•Aug 1, 2018•0 citations
Quantum control is a fundamental tool for quantum technologies, and quantum Zeno (QZE) and anti-Zeno (AZE) effects, respectively denoting the slowdown and speedup of quantum system evolution by frequent interruptions/operations, represent quantum control paradigms. Indeed, they allow either protecting (QZE) or steering (AZE) the state of a quantum system via the interplay between frequent operations (system control) and the coupling of the system to its environment. Here we present two experiments demonstrating the possibility to exploit QZE and AZE to extract information on noise processes occurring in a quantum channel. In the first experiment, we realize the first noise diagnostics scheme based on repeated quantum measurements, showing how a single photon undergoing a noise process (in our case, random polarization fluctuations) can quantify non-Markovian temporal correlations within such a noise. In the second experiment, we show how a QZE-protection mechanism applied to a quantum state can become a noise sensing technique, allowing to estimate the statistical distribution of decoherence effects occurring on a photonic qubit during its propagation in a noisy quantum channel.
We experimentally demonstrate, for the first time, noise diagnostics by repeated quantum measurements, establishing the ability of a single photon subjected to random polarization noise to diagnose non-Markovian temporal correlations of such a noise process. Both the noise spectrum and temporal correlations are diagnosed by probing the photon with frequent (partially) selective polarization measurements. We show that noise with positive temporal correlations corresponds to our single photon undergoing a dynamical regime enabled by the quantum Zeno effect (QZE), whereas noise characterized by negative (anti) correlations corresponds to regimes associated with the anti-Zeno effect (AZE). This is the first step toward a novel noise spectroscopy based on QZE and AZE in single-photon state probing able to extract information on the noise while protecting the probe state, a conceptual paradigm shift with respect to traditional interferometric measurements.