Experimental generation of multi-photon Fock states

Cooper, Merlin; Wright, Laura J.; Söller, Christoph; Smith, Brian J.

doi:10.1364/oe.21.005309

Cited by 105 publications

(92 citation statements)

References 27 publications

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“…For the Fock state |N a ,n a ≃ 4 means N = 4. In experiments, Fock states with up to two [48] and three [49] running photons in optics have recently been generated. For even or odd coherent states |α 0± a ,n a ≃ 4 corresponds to α 0 ≃ 2, which is very close to current experimental realizations.…”

Section: F Quantum Crb Versus the Thermal Photon Numbern Thmentioning

confidence: 99%

Enhanced interferometry using squeezed thermal states and even or odd states

et al. 2014

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We derive a general expression of the quantum Fisher information for a Mach-Zehnder interferometer, with the port inputs of an arbitrary pure state and a squeezed thermal state. We find that the standard quantum limit can be beaten, when even or odd states are applied to the pure-state port. In particular, when the squeezed thermal state becomes a thermal state, all the even or odd states have the same quantum Fisher information for given photon numbers. For a squeezed thermal state, optimal even or odd states are needed to approach the Heisenberg limit. As examples, we consider several common even or odd states: Fock states, even or odd coherent states, squeezed vacuum states, and single-photon-subtracted squeezed vacuum states. We also demonstrate that super-precision can be realized by implementing the parity measurement for these states.

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Section: F Quantum Crb Versus the Thermal Photon Numbern Thmentioning

confidence: 99%

Enhanced interferometry using squeezed thermal states and even or odd states

et al. 2014

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“…Thus, to have access to a reference frame is an important issue in practical situations. We note, however, that in an experimentally achievable regime with current technology (σ = 0.1) [22,[26][27][28], two compared methods may not have a significant difference in their performances. Moreover, in this regime, two methods can detect almost all nonclassical Gaussian states except those with a small nonclassical squeezing 0 < r nc < 0.0033.…”

Section: Fidelity and Nonclassicalitymentioning

confidence: 81%

Gaussian states under coarse-grained continuous variable measurements

Park

Lee

et al. 2014

Phys. Rev. A

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The quantum-to-classical transition of a quantum state is a topic of great interest in fundamental and practical aspects. A coarse-graining in quantum measurement has recently been suggested as its possible account in addition to the usual decoherence model. We here investigate the reconstruction of a Gaussian state (single mode and two modes) by coarse-grained homodyne measurements. To this aim, we employ two methods, the direct reconstruction of the covariance matrix and the maximum likelihood estimation (MLE), respectively, and examine the reconstructed state under each scheme compared to the state interacting with a Gaussian (squeezed thermal) reservoir. We clearly demonstrate that the coarse-graining model, though applied equally to all quadrature amplitudes, is not compatible with the decoherence model by a thermal (phase-insensitive) reservoir. Furthermore, we compare the performance of the direct reconstruction and the MLE methods by investigating the fidelity and the nonclassicality of the reconstructed states and show that the MLE method can generally yield a more reliable reconstruction, particularly without information on a reference frame (phase of input state).

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“…Several non-classical photon number (Fock) states35363738 are examined using the calibrated detector. The density matrices ρ are estimated by fitting the probe state data patterns to the frequency distribution of measurement outcomes for heralded one-, two- and three-photon Fock states according to equation (3).…”

Section: Resultsmentioning

confidence: 99%

“…The signal and trigger modes are separated by a polarizing beam splitter. A spatially multiplexed detector comprising a fibre beam splitter network and three avalanche photodiodes (Perkin-Elmer SPCM-AQ4C) enables heralding of one-, two- and three-photon Fock states conditioned on registering one, two and three ‘clicks’, respectively, from the multiplexed detector38. The heralded Fock state in the signal mode is combined with the local oscillator for performing balanced homodyne detection.…”

Section: Methodsmentioning

confidence: 99%

Local mapping of detector response for reliable quantum state estimation

2014

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Improved measurement techniques are central to technological development and foundational scientific exploration. Quantum physics relies on detectors sensitive to non-classical features of systems, enabling precise tests of physical laws and quantum-enhanced technologies including precision measurement and secure communications. Accurate detector response calibration for quantum-scale inputs is key to future research and development in these cognate areas. To address this requirement, quantum detector tomography has been recently introduced. However, this technique becomes increasingly challenging as the complexity of the detector response and input space grow in a number of measurement outcomes and required probe states, leading to further demands on experiments and data analysis. Here we present an experimental implementation of a versatile, alternative characterization technique to address many-outcome quantum detectors that limits the input calibration region and does not involve numerical post processing. To demonstrate the applicability of this approach, the calibrated detector is subsequently used to estimate non-classical photon number states.

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Experimental generation of multi-photon Fock states

Cited by 105 publications

References 27 publications

Enhanced interferometry using squeezed thermal states and even or odd states

Enhanced interferometry using squeezed thermal states and even or odd states

Gaussian states under coarse-grained continuous variable measurements

Local mapping of detector response for reliable quantum state estimation

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