Experimental Generation of Squeezed Cat States with an Operation Allowing Iterative Growth

Etesse, Jean; Bouillard, Martin; Kanseri, Bhaskar; Tualle-Brouri, Rosa

doi:10.1103/physrevlett.114.193602

Cited by 111 publications

(122 citation statements)

References 40 publications

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“…For example, local strategies have greater flexibility in the distribution of resources and are more robust to local estimation failure. Furthermore, single-mode states with a large number variance can be made in experiments [14][15][16][17], and realistic schemes have been proposed to produce separable states that improve over the shot-noise limit by more than a factor of 4 [18]. By comparison, multimode-entangled states with large photon numbers are notoriously difficult to make: the largest two-mode optical NOON state that has been made experimentally contains only five photons [27].…”

Section: Discussionmentioning

confidence: 99%

“…In this more general setting we demonstrate that the same precision enhancements exhibited by the global strategies can be obtained with mode-separable states and local measurements alone. Local strategies offer a number of advantages over their global counterparts, including robustness to local estimation failure, more flexibility in the distribution of resources, and more realistic methods of state preparation [14][15][16][17][18], measurement, and control.…”

Section: Introductionmentioning

confidence: 99%

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Local versus global strategies in multiparameter estimation

et al. 2016

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(2016) Local versus global strategies in multi-parameter estimation. Physical Review A, 94 (6). a2312. ISSN 1050ISSN -2947 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/65580/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. We consider the problem of estimating multiple phases using a multimode interferometer. In this setting we show that while global strategies that estimate all the phases simultaneously can lead to high precision gains, the same enhancements can be obtained with local strategies in which each phase is estimated individually. A key resource for the enhancement is shown to be a large particle-number variance in the probe state, and for states where the total particle number is not fixed, this can be obtained for mode-separable states, and the phases can be read out with local measurements. This has important practical implications because local strategies are generally preferred to global ones for their robustness to local estimation failure, flexibility in the distribution of resources, and comparatively easier state preparation. We obtain our results by analyzing two different schemes: the first uses a set of interferometers, which can be used as a model for a network of quantum sensors, and the second looks at measuring a number of phases relative to a reference, which is concerned primarily with quantum imaging.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local versus global strategies in multiparameter estimation

et al. 2016

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“…Similar methods for engineering non-Gaussian states were already studied, based on the use of ancillary single-photon states and homodyne [19,20] or heterodyne [13] detection respectively. In the second method that we propose, the input state is coupled to a squeezed ancilla and a single photon is detected in one mode by means of a SPC.…”

Section: Introductionmentioning

confidence: 99%

Polynomial approximation of non-Gaussian unitaries by counting one photon at a time

2017

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In quantum computation with continous-variable systems, quantum advantage can only be achieved if some non-Gaussian resource is available. Yet, non-Gaussian unitary evolutions and measurements suited for computation are challenging to realize in the lab. We propose and analyze two methods to apply a polynomial approximation of any unitary operator diagonal in the amplitude quadrature representation, including non-Gaussian operators, to an unknown input state. Our protocols use as a primary non-Gaussian resource a single-photon counter. We use the fidelity of the transformation with the target one on Fock and coherent states to assess the quality of the approximate gate.

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“…We are therefore looking for a strong unifying witness capable of verifying the quality of single photon states as well as their indistinguishability. At the same time, we want a witness which employs high quality homodyne detectors in order to make it compatible with CV quantum information processing [4,5]. And finally, we want to observe the interference effect directly, without the need to consider different measurement bases and settings, and subsequent reconstruction of the state's density matrix.…”

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confidence: 99%

“…However, from the point of view of continuous variables (CV) and the more general framework of hybrid quantum technology [3][4][5][6], these experiments quantify only the particle nature of the interference and ignore the vacuum and the related phase sensitive aspects [7] of the photon bunched state. The full picture of two-photon interference can be obtained by replacing the photon counters with homodyne detection and performing a full tomography [8,9].…”

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confidence: 99%

Direct observation of phase-sensitive Hong-Ou-Mandel interference

et al. 2017

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Quality of individual photons and their ability to interfere is traditionally tested by measuring the Hong-Ou-Mandel photon bunching effect. However, this phase insensitive measurement only tests the particle aspect of the quantum interference. Motivated by these limitations, we formulate a witness capable of recognizing both the quality and the coherence of two photons from a single set of measurements. We exploit the conditional nonclassical squeezing which is sensitive to both the quality of the single photons and their indistinguishability and we show that it can be used to directly reveal both the particle and the wave aspects of the quantum interference. Finally, we experimentally test the witness by applying it to a pair of independent single photons generated on demand.PACS numbers: 42.50. Xa, 42.50.Ar, 42.50.Dv, 42.50.Ex Quantum interference of individual photons is one of the fundamental keystones of quantum technology. The ability to recognize whether photons from different sources can interfere is therefore an important one. The basic tests use photon correlation measurements to ascertain presence of individual photons and two-photon bunching to verify their interference. The experimental test of the bunching effect traditionally employs the Hong-Ou-Mandel interference [1], in which the two individual photons are mixed on a balanced beam splitter and the resulting two mode field is measured by a pair of photon counters. The bunching manifests as the lack of coincidence counts -if the coincidence probability is below one half, the interference effect is nonclassical, i. e. incompatible with description using a mixture of classical waves or classical particles. Recent experiments for a wide range of experimental platforms safely observed low values of coincidence counts and thus demonstrated this fundamental nonclassical aspect [2].For discrete variable quantum technology (DV) these features are sufficient. However, from the point of view of continuous variables (CV) and the more general framework of hybrid quantum technology [3][4][5][6], these experiments quantify only the particle nature of the interference and ignore the vacuum and the related phase sensitive aspects [7] of the photon bunched state. The full picture of two-photon interference can be obtained by replacing the photon counters with homodyne detection and performing a full tomography [8,9]. The reconstructed density matrix can then be analyzed in order to visualize and evaluate the interference caused by the the indistinguishability. The drawback to this tomographic approach is that it can not be used as a direct witness. The tomographic reconstruction is a process combining information from many incompatible measurements in order to obtain not directly measurable quantities, such as off-diagonal elements of the density matrix.The elements of the reconstructed matrix contain, in principle, full information about the state. However, the information is practically limited due to unavailability of a complete set of measurement and the ...

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Experimental Generation of Squeezed Cat States with an Operation Allowing Iterative Growth

Cited by 111 publications

References 40 publications

Local versus global strategies in multiparameter estimation

Local versus global strategies in multiparameter estimation

Polynomial approximation of non-Gaussian unitaries by counting one photon at a time

Direct observation of phase-sensitive Hong-Ou-Mandel interference

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