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Measurement of the two-time intensity-correlation function of arbitrary states
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

For light intensity correlations measurements, different methods are used in the high photon number or high intensity regime and in the single- and two-photon regime. Hence, there is an unfortunate measurement ``gap’’ primarily for multi-photon, quantum states. These states, for example multi-photon Fock states will be increasingly important in the realization of quantum technologies and in exploring the boundaries between quantum and classical optics. We show that a na\"{i}ve approach, based on attenuation, state splitting, and two-detector correlation, can give the correct two-time intensity correlation for any state. We analyze how added losses decrease the measurement’s systematic error. The price to be paid is that the losses increase the measurement statistical error or alternatively, increases the acquisition time for a given tolerable level of statistical error. We have experimentally demonstrated the feasibility of the method for a coherent state and a quasi-thermal state. The method is easy to implement in any laboratory and will simplify characterization of medium and highly excited non-classical states as they become experimentally available.

Keywords [en]
quantum optics
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-228057OAI: oai:DiVA.org:kth-228057DiVA, id: diva2:1206452
Funder
Swedish Research Council, 621-2014-5410
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved
In thesis
1. Generation and detection of non-classical photon states
Open this publication in new window or tab >>Generation and detection of non-classical photon states
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Alternative title[sv]
Generation och detektion av icke-klassiska fotontillstånd
Abstract [en]

This thesis intends to familiarize the reader with the concepts of photon statistics and correlations in quantum optics. Developing light sources that emit quantum states is central for the realization of quantum technologies. One important step in characterizing these sources is the measurement of field fluctuations and correlations, by coincidence measurements. The expectation value of a coincidence measurement, a simultaneous measurement of two intensities (or, more general, four fields), is represented by the fourth-order correlation function. The value of the correlation function, at zero delay between the detection of two photons, reveals important properties of the state to which they belonged, for example the fluctuations of the photon number. Since predictability is important for many applications, light sources emitting single photons are also characterized by the indistinguishability of consecutively emitted photons, or of two photons from separate emitters. In paper I we investigate blinking behaviour in quantum emitters, and its effect on the interference pattern and photon statistics with photons from two separate emitters. Blinking refers to an emitters transition into a non-emitting state, and subsequent transition back to an emitting state. We show that blinking can not be treated as linear loss, when measuring the fourth-order correlation function for two emitters in a Hong-Ou-Mandel setup. In general, a measurement of the fourth-order correlation function is robust to loss, which makes it a very practical tool. However, the relation between recorded coincidence counts and the correlation function is only direct in the limit of zero detection efficiency, and depends on the detection system. In paper II, we show that by adding a variable attenuation in the beam path, we can trace back to the ''true'' value of the correlation function at zero quantum efficiency. This method improves accuracy in correlation measurements by decreasing a systematic error at the expense of an increased statistical error, which is easier to handle, extending the use of coincidence methods to classical and non-classical multi-photon states.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 48
Series
TRITA-SCI-FOU ; 2018:23
Keywords
quantum optics, optical coherence, photon statistics
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-228058 (URN)978-91-7729-815-1 (ISBN)
Presentation
2018-06-15, FB53, AlbaNova university center, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved

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