Photon-number-resolving detection using time-multiplexing

Achilles, Daryl; Silberhorn, Christine; Śliwa, Cezary; Banaszek, Konrad; Walmsley, Ian A.; Fitch, Michael J.; Jacobs, B. C.; Pittman, T. B.; Franson, J. D.

doi:10.1080/09500340410001670875

Cited by 32 publications

(21 citation statements)

References 20 publications

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“…The simulation accounts for all sources of loss in the experiment in the abstract loss model [25] using a single parameter η representing the overall transmission of the setup. The simulation also assumes that all the photons arrive in a single identical spatial and temporal mode.…”

Section: Resultsmentioning

confidence: 99%

Experimental tomography of NOON states with large photon numbers

et al. 2012

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We have performed experimental quantum state tomography of NOON states with up to four photons. The measured states are generated by mixing a classical coherent state with spontaneous parametric down-conversion. We show that this method produces states which exhibit a high fidelity with ideal NOON states. The fidelity is limited by the overlap of the two-photon down-conversion state with any two photons originating from the coherent state, for which we introduce and measure a figure of merit. A second limitation on the fidelity set by the total setup transmission is discussed. We also apply the same tomography procedure for characterizing correlated photon hole states.

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Section: Resultsmentioning

confidence: 99%

Experimental tomography of NOON states with large photon numbers

et al. 2012

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“…We approximate number-resolving detection using a multiplexed method 25,31 using readily available components. We use four 1 × 4 optical fibre splitters with 16 'bucket detector' avalanche photodiode SPCM (APDs).…”

Section: Introductionmentioning

confidence: 99%

Towards practical quantum metrology with photon counting

et al. 2016

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Quantum metrology aims to realise new sensors operating at the ultimate limit of precision measurement. However, optical loss, the complexity of proposed metrology schemes and interferometric instability each prevent the realisation of practical quantumenhanced sensors. To obtain a quantum advantage in interferometry using these capabilities, new schemes are required that tolerate realistic device loss and sample absorption. We show that loss-tolerant quantum metrology is achievable with photoncounting measurements of the generalised multi-photon singlet state, which is readily generated from spontaneous parametric downconversion without any further state engineering. The power of this scheme comes from coherent superpositions, which give rise to rapidly oscillating interference fringes that persist in realistic levels of loss. We have demonstrated the key enabling principles through the four-photon coincidence detection of outcomes that are dominated by the four-photon singlet term of the four-mode downconversion state. Combining state-of-the-art quantum photonics will enable a quantum advantage to be achieved without using post-selection and without any further changes to the approach studied here.

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“…Theoretical studies of the "pushing gate" were extended to the case of two ions in the same trap [8] (extension of milestone 1). The photo-ionization trap loading method was further optimized so that we can load pure crystals of 43 Ca + of arbitrary size (extension of milestone 2).…”

Section: Yearmentioning

confidence: 99%

Research in Atomic, Ionic and Photonic Systems for Scalable Deterministic Quantum Logic

Banaszek¹,

Foot²,

Lucas³

et al. 2005

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The "pushing gate" that we intend to use to entangle ions was thoroughly studied theoretically (milestone 1 complete). We proposed a solution to a hidden weakness in the original proposal which led to extreme sensitivity to, for example, laser intensity noise. We demonstrate that fast gates of good fidelity are possible without ground-state cooling [1].We implemented and quantitatively studied photo-ionization ion loading and optimized the loading process so that we could trap and laser-cool all the naturally-occurring isotopes of calcium (including the 0.004%-abundant 46 Ca). We can load single ions or small crystals "on demand", from a background vapour pressure 4-5 orders of magnitude lower than with electron bombardment, and with negligible drift in static electric fields between loads; this gives increased environmental stability for the ion-qubits and should reduce deposition on electrodes to a negligible level. Most importantly for the implementation of qubits, we can reliably load small, pure, crystals of the 0.14%-abundant 43 Ca+ ion (milestone 2 complete). The ability to do this without an enriched isotopic source was beyond our expectations and represents a significant experimental simplification. Isotope-selection of specific even isotopes (e.g. We began the design process for our next-generation multiple trap (start of milestone 3), with studies of possible electrode structures. We designed and had built a high-power solid-state violet laser system in order to test its suitability for implementing the "pushing gate" (start of milestone 4).

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Photon-number-resolving detection using time-multiplexing

Cited by 32 publications

References 20 publications

Experimental tomography of NOON states with large photon numbers

Experimental tomography of NOON states with large photon numbers

Towards practical quantum metrology with photon counting

Research in Atomic, Ionic and Photonic Systems for Scalable Deterministic Quantum Logic

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