aqora

Direct measurement of the wavefunction of a single photon

C. Bamber, Jeff S. Lundeen, Aabid Patel +2 more

The photon wavefunction is measured by a direct method that does not require computation reconstruction. A reading on our measurement apparatus is directly proportional to the real and imaginary parts of the wavefunction.

Frontiers in OpticsJan 1, 20111 citation

Direct measurement of the Wigner function by photon-number-resolving detection

Niranjan Sridhar, Reihaneh Shahrokhshahi, Aaron Miller +5 more

Photon-number-resolving (PNR) detection allows for the direct measurement of the Wigner quasi-probability distribution of an optical mode without the need for numerically processing an inverse Radon transform [Phys. Rev. Lett.76, 4344 (1996)10.1103/PhysRevLett.76.4344PRLTAO0031-9007]. In this work, we reproduced the seminal experiment of Banaszek et al. [Phys. Rev. A60, 674 (1999)10.1103/PhysRevA.60.674PLRAAN1050-2947] of quantum tomography of a pure coherent state, and of a statistical mixture thereof, and extended it to the more general case of photon fluxes with much more than one photon per detection time. This was made possible by the use of a superconducting transition-edge sensor to perform PNR detection from zero to five photons at 1064 nm, at ∼70% system efficiency and with no dead time. We detail signal acquisition and detection efficiency and discuss prospects for applying such quantum tomography to non-Gaussian states.Photon-number-resolving (PNR) detection allows for the direct measurement of the Wigner quasi-probability distribution of an optical mode without the need for numerically processing an inverse Radon transform [Phys. Rev. Lett.76, 4344 (1996)10.1103/PhysRevLett.76.4344PRLTAO0031-9007]. In this work, we reproduced the seminal experiment of Banaszek et al. [Phys. Rev. A60, 674 (1999)10.1103/PhysRevA.60.674PLRAAN1050-2947] of quantum tomography of a pure coherent state, and of a statistical mixture thereof, and extended it to the more general case of photon fluxes with much more than one photon per detection time. This was made possible by the use of a superconducting transition-edge sensor to perform PNR detection from zero to five photons at 1064 nm, at ∼70% system efficiency and with no dead time. We detail signal acquisition and detection efficiency and discuss prospects for applying such quantum tomography to non-Gaussian states.

arXiv:1409.7101Journal of the Optical Society of America BSep 24, 201431 citations

Characterization of quantum states of light by means of homodyne detection and reconstruction of Wigner functions

Andrés Martínez Silva

In this work, a continuous variable quantum tomography is presented. This is done using two approaches, one using simulated data and another one using data from measurements performed in the laboratory. The Radon inverse transform, under the approximation of filtered back projection, alongside the details on the implementa- tion of balanced homodyne detection needed to perform the tomography are clearly explained. Density matrices in the quadrature and number representation are also obtained from the Wigner function. Additionally, complete documentation of the computational implementation and a user-friendly interface for the tomography is reportedIn this work, a continuous variable quantum tomography is presented. This is done using two approaches, one using simulated data and another one using data from measurements performed in the laboratory. The Radon inverse transform, under the approximation of filtered back projection, alongside the details on the implementa- tion of balanced homodyne detection needed to perform the tomography are clearly explained. Density matrices in the quadrature and number representation are also obtained from the Wigner function. Additionally, complete documentation of the computational implementation and a user-friendly interface for the tomography is reported

Jan 1, 20200 citations

Efficient quantum tomography of two-mode Wigner functions

Ludmila Botelho, Reinaldo O. Vianna

arXiv:1912.12222The European Physical Journal DFeb 27, 20205 citations

Tomography for quantum diagnostics

Jaroslav Řeháček, Dmitri S. Mogilevtsev, Z. Hradil

We introduce a resolution measure, which provides error bars for any quantity inferred from tomographic measurement. Method is illustrated with the diagnostics of non-classical behavior using Wigner function at the origin.

International Conference on Quantum InformationJan 1, 20080 citations

State-independent quantum state tomography by photon-number-resolving measurements

Rajveer Nehra, Aye Win, Miller Eaton +6 more

The Wigner quasiprobability distribution of a narrowband single-photon state was reconstructed by quantum state tomography using photon-number-resolving measurements with transition-edge sensors (TES) at system efficiency 58(2)%. This method makes no assumptions on the nature of the measured state, save for the limitation on photon flux imposed by the TES. Negativity of the Wigner function was observed in the raw data without any inference or correction for decoherence.

arXiv:1906.02093OpticaOct 9, 201930 citations

Direct measurement of the Wigner function by photon-number-resolving detection

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Direct measurement of the Wigner function by photon-number-resolving detection

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