Experimental quantum tomography of a homodyne detector

Grandi, Samuele; Zavatta, Alessandro; Bellini, M.; Paris, Matteo G. A.

doi:10.1088/1367-2630/aa6f2c

Cited by 52 publications

(28 citation statements)

References 62 publications

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“…Introduction -Homodyne detection (HD) is an effective tool to characterize the quantum state of light in either the time [1][2][3][4][5][6][7][8] or the frequency [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] domain. In a spectral homodyne detector, the signal under investigation interferes at a balanced beam splitter with a local oscillator (LO) with frequency ω 0 .…”

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confidence: 99%

Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection and a state-balancing detector

et al. 2016

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We suggest and demonstrate a scheme to reconstruct the symmetric two-mode squeezed thermal states of spectral sideband modes from an optical parametric oscillator. The method is based on a single homodyne detector and active stabilization of the cavity. The measurement scheme have been successfully tested on different two-mode squeezed thermal states, ranging from uncorrelated coherent states to entangled states.PACS numbers: 03.65. Wj, 42.50.Lc, 42.50.Dv Introduction -Homodyne detection (HD) is an effective tool to characterize the quantum state of light in either the time [1][2][3][4][5][6][7][8] or the frequency [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] domain. In a spectral homodyne detector, the signal under investigation interferes at a balanced beam splitter with a local oscillator (LO) with frequency ω 0 . The two outputs undergo a photodetection process and their photocurrents are combined leading to a photocurrent continuously varying in time. The information about the spectral field modes at frequencies ω 0 ± Ω (sidebands) is then retrieved by electronically mixing the photocurrent with a reference signal with frequency Ω and phase Ψ. Upon varying the phase θ of the LO, we may access different field quadratures, whereas the phase Ψ can be adjusted to select the symmetric S or antisymmetric A balanced combinations of the upper and lower sideband modes.

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Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection and a state-balancing detector

et al. 2016

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“…The main tool for the experimental characterisation of Gaussian states is homodyne detection [6,7,8,9,10,11,12], which allows one to detect a fixed field-quadrature on the input state. The set of data obtained by measuring the quadratures at different phase may be then exploited for the tomographic reconstruction the quantum state, i.e.…”

Section: Introductionmentioning

confidence: 99%

Homodyning the g(2)(0) of Gaussian states

Olivares

Cialdi

Paris

2018

Optics Communications

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We suggest a method to reconstruct the zero-delay-time second-order correlation function g (2) (0) of Gaussian states using a single homodyne detector. To this purpose, we have found an analytic expression of g (2) (0) for single-and two-mode Gaussian states in terms of the elements of their covariance matrix and the displacement amplitude. In the single-mode case we demonstrate our scheme experimentally, and also show that when the input state is nonclassical, there exist a threshold value of the coherent amplitude, and a range of values of the complex squeezing parameter, above which g (2) (0) < 1. For amplitude squeezing and real coherent amplitude, the threshold turns out to be a necessary and sufficient condition for the nonclassicality of the state. Analogous results hold also for two-mode squeezed thermal states.

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“…The benefit of using entanglement in a specific interferometric setup has also been discussed [24]. Recently the problem of estimating both the loss and the phase shift in interferometry has been addressed [25], as well as the related problem of estimating the efficiency of realistic detectors [26,27].…”

Section: Introductionmentioning

confidence: 99%

Enhanced estimation of loss in the presence of Kerr nonlinearity

2016

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We address the characterization of dissipative bosonic channels and show that estimation of the loss rate by Gaussian probes (coherent or squeezed) is improved in the presence of Kerr nonlinearity. In particular, enhancement of precision may be substantial for short interaction time, i.e. for media of moderate size, e.g. biological samples. We analyze in detail the behaviour of the quantum Fisher information (QFI), and determine the values of nonlinearity maximizing the QFI as a function of the interaction time and of the parameters of the input signal. We also discuss the precision achievable by photon counting and quadrature measurement and present additional results for truncated, few-photon, probe signals. Finally, we discuss the origin of the precision enhancement, showing that it cannot be linked quantitatively to the non-Gaussianity of the interacting probe signal.

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Experimental quantum tomography of a homodyne detector

Cited by 52 publications

References 62 publications

Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection and a state-balancing detector

Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection and a state-balancing detector

Homodyning the g(2)(0) of Gaussian states

Enhanced estimation of loss in the presence of Kerr nonlinearity

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