High-fidelity single-photon source based on a Type II optical parametric oscillator

Morin, Olivier; D’Auria, Virginia; Fabre, Claude; Laurat, Julien

doi:10.1364/ol.37.003738

Cited by 50 publications

(46 citation statements)

References 26 publications

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“…By using this technique, we demonstrated in [3] a 79% fidelity with a singlephoton state without any correction of detection losses (91% after correction), the highest value reported to date.…”

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confidence: 76%

Optimal temporal mode extraction for quantum state engineering via a direct multimode analysis of homodyne data

Morin

Fabre

Laurat

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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The ability to engineer various quantum states of light is a central requirement for quantum information processing, including quantum communication, computing and metrology. In this endeavor, many experiments use the so-called conditional preparation technique. The dynamic of the heralded states, i.e. its temporal mode, mainly depends on the setup and has been studied theoretically with different strategies [1,2]. However, it remains difficult to extract the optimal mode with a precise description of the experimental setup: it requires very often some additional assumptions. This is why it is important to characterize experimentally the dynamic of the generated states as it might improve the fidelity of the generated state.Some experiments have been realized to study this issue. They are based on photon-counting coincidence. On one hand, this technique can be questionable as the detector is not photon number resolved and, on the other hand, it can also be very difficult to implement for some wavelengths for which the quantum efficiency of photon detectors is low. Here we present a novel approach, based on homodyne measurements, to determine the temporal mode function involved in a conditional preparation. This method, which only uses data from quantum state tomography performed by homodyne measurements, enables to include all the experimental aspects that theory may forget for simplicity and to extract the optimal temporal mode directly from the data.As an illustration, we consider the generation of a single-photon state by conditional measurement operated on a two-mode squeezed state. By using this technique, we demonstrated in [3] a 79% fidelity with a singlephoton state without any correction of detection losses (91% after correction), the highest value reported to date.In our experiment, the heralded state is characterized by homodyne quantum state tomography. For each recorded segment one extracts the quadrature measurement by using a temporal mode . Our goal is to measure the temporal mode occupied by the single photon state. The initial idea uses the fact that the measured electromagnetic field contains some single photon state, vacuum and very small thermal states. We can thus optimize the temporal mode by maximizing the variance of the mode. Analytically this optimal mode corresponds to the eigenfunction of the quadrature correlation function with the highest eigenvalue. Fig. 1 a) eigenvalues of the correlation function for heralded state (red) and vacuum (blue). b) First eigenmode (red) and the theoretical temporal mode (blue).The experimental results shown in Fig 1.a provide the variance of the electromagnetic field in the basis of the eigenmodes of the correlation function. The single-mode character can be clearly seen (i.e. high purity is achieved). This approach enabled to optimize the setup. Thanks to this process, the final results are very closed to the simplest theoretical model, as shown in Fig 1.b for the temporal mode. This works gives a more complete information in terms of multimode decomp...

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confidence: 76%

Optimal temporal mode extraction for quantum state engineering via a direct multimode analysis of homodyne data

Morin

Fabre

Laurat

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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“…As our objective is to find practical states for quantum metrology, we construct our state engineering protocols from elements of an experimentally ready toolbox of quantum optics states, operators, and measurements, which is summarised in table 1. Here we only introduce the important details of the toolbox; more details can be found in appendix A. Firstly, the input states we include are the squeezed vacuum (SV) ñ |z , the coherent state añ | , and Fock states ñ |n ; the parameters z, α and n are constrained by what is possible experimentally [7,29,[35][36][37][38].…”

Section: A Quantum State Engineering Algorithmmentioning

confidence: 99%

A search algorithm for quantum state engineering and metrology

Knott

2016

New J. Phys.

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In this paper we present a search algorithm that finds useful optical quantum states which can be created with current technology. We apply the algorithm to the field of quantum metrology with the goal of finding states that can measure a phase shift to a high precision. Our algorithm efficiently produces a number of novel solutions: we find experimentally ready schemes to produce states that show significant improvements over the state-of-the-art, and can measure with a precision that beats the shot noise limit by over a factor of 4. Furthermore, these states demonstrate a robustness to moderate/high photon losses, and we present a conceptually simple measurement scheme that saturates the Cramér-Rao bound.

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“…The optical circuit, illustrated in Fig 1(a), is based on a triply resonant type-II Optical Parametric Oscillator [5,6]. Pumped by a 532 nm continuous-wave laser far below threshold, it generates a two-mode squeezed vacuum at 1064 nm.…”

Section: Experimental Implementationmentioning

confidence: 99%

Efficient Optical Generation of Large-Amplitude Schrödinger Cat States with Minimal Resources

Jeannic

Huang

Ruaudel

et al. 2015

CLEO: 2015 Postdeadline Paper Digest

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We demonstrate a protocol enabling the generation of large coherent state superpositions with unprecedented preparation rate. It is optimally using expensive non-Gaussian resources to build up only the core non-Gaussian part of the state.Non-Gaussian states of light -such as coherent states superposition (CSS) of the form |α ± | − α with |α a coherent states with mean photon number value |α| 2 , also sometimes called optical Schrödinger cat states-are critical resources in the emerging field of optical hybrid quantum information [1,2]. A well-known and seminal protocol to generate odd optical CSS of size |α| 2 ∼ 1 is based on photon subtraction operated on squeezed vacuum state. To reach higher mean photon values, experiments have focused on multiple subtractions or cascaded conditionings. In all the reported approaches to date, the generation rate is intrinsically low, at the Hz level or below, precluding their use in subsequent protocols.Here we demonstrate the experimental realization of large-amplitude even squeezed Schrödinger cat states with a size |α| 2 = 3 and a fidelity of 67%. The generated state exhibits the highest amplitude and fidelity reported to date for free-propagating CSS, and importantly a preparation rate about 200 Hz is achieved, as we recently reported in [3]. These observations are made possible by implementing a strategy focusing all the non-Gaussian resources to prepare only the non-Gaussian part of the state, and by the combination of a large escape efficiency optical parametric oscillator and high-efficiency superconducting nanowire single-photon detectors.

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High-fidelity single-photon source based on a Type II optical parametric oscillator

Cited by 50 publications

References 26 publications

Optimal temporal mode extraction for quantum state engineering via a direct multimode analysis of homodyne data

Optimal temporal mode extraction for quantum state engineering via a direct multimode analysis of homodyne data

A search algorithm for quantum state engineering and metrology

Efficient Optical Generation of Large-Amplitude Schrödinger Cat States with Minimal Resources

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