Nonlocal Pulse Shaping with Entangled Photon Pairs

Bellini, Marco; Marín, F.; Viciani, Silvia; Zavatta, Alessandro; Arecchi, F. T.

doi:10.1103/physrevlett.90.043602

Cited by 72 publications

(65 citation statements)

References 20 publications

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“…It is easy to see how the spectral purity parameter P t approaches unity when σ f ≪ σ p . In such a condition the strong spectral filtering performs a non-local selection of a pure signal state whose properties are defined by the pump as shown in [13,15]. Similarly, the spatial purity parameter is found to be [12]:…”

Section: Generation Of Single-photon Fock Statesmentioning

confidence: 99%

Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection

2004

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A single-photon Fock state has been generated by means of conditional preparation from a twophoton state emitted in the process of spontaneous parametric down-conversion. A recently developed high-frequency homodyne tomography technique has been used to completely characterize the Fock state by means of a pulse-to-pulse analysis of the detectors' difference photocurrent. The density matrix elements of the generated state have been retrieved with a final detection efficiency of about 57%. A comparison has been performed between the phase-averaged tomographic reconstructions of the Wigner function as obtained from the measured density-matrix elements and from a direct Abel transform of the homodyne data. The ability of our system to work at the full repetition rate of the pulsed laser (82 MHz) substantially simplifies the detection scheme, allowing for more "exotic" quantum states to be generated and analyzed.

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Section: Generation Of Single-photon Fock Statesmentioning

confidence: 99%

Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection

2004

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“…The method is based on general photon shaping idea proposed in [23]. Furthermore the method can be viewed as remote preparation of time-encoded single-photon state [24] or as "ghost" interference [25] in the time domain [26].…”

mentioning

confidence: 99%

Temporal shaping of single photons enabled by entanglement

et al. 2017

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We propose a method to produce pure single photons with an arbitrary designed temporal shape in a heralded, lossless and scalable way. As the indispensable resource, the method uses pairs of time-energy entangled photons. To accomplish the shaping, one photon of a pair undergoes temporal modulation according to the desired shape. Subsequent frequency-resolving detection of the photon heralds its entangled counterpart in a pure quantum state with a temporal shape non-locally affected by the modulation. We found conditions for the shape of the heralded photon to reproduce the modulation function. The method can be implemented with various sources of time-energy entangled photons. In particular, using entangled photons from the parametric down-conversion the method enables generation of pure photons with tunable shape within unprecedentedly broad range of temporal durations -from tenths of femtoseconds to microseconds. Proposed shaping of single photons will push forward implementation of scalable multidimensional quantum information protocols, efficient photon-matter coupling and quantum control at the level of single quanta.Single photons are indispensable tool in quantum information, quantum communication and quantum metrology [1]. Depending on specific application, photons must be tuned in wavelength, bandwidth, polarization, and other degrees of freedom. For example, to transmit information over optical fibers one uses photons at telecom wavelengths, while photonatom coupling requires wavelength and bandwidth of photons matched to the corresponding atomic transition.It has been realized in the last decade that full control over the spatio-temporal shape of a single photon light [2, 3] is required in a number of applications. For example, photons, having identical Lorentzian spectral shapes, can exhibit opposite temporal shapes -exponential decaying or rising -depending on spectral distribution of the phase. As a result, photons with exponential decaying shape excite a two-level atom in free space only with 50% efficiency, while exponentially rising photons with 100% efficiency [4][5][6]. There are other situations where the temporal photon shape is important: symmetric shape is optimal for cavity QED quantum communication [7]; Gaussian shape is superior for experiments relying on single-photon interference [8]. Furthermore, development of sources of shaped photons will push forward photonic implementation of high-dimensional quantum information protocols, e.g. quantum key distribution [9][10][11][12][13][14].Present-day methods for producing temporally shaped photons can be divided in two groups: single photons are shaped either during the generation process or photon shaping is performed after the generation. Methods of the first group are typically based on control of quantum emitters (single atom [15,16], ion [17], atomic ensemble [18], quantum dot [19]). Development of these methods is promising for deterministic production of shaped photons, however the methods often require sophisticated and costly setup...

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“…Detection of a photon in one spatial mode implies the presence of a photon in the other mode with high probability. The production of single photons using this technique is widely employed in present-day quantum optics experiments and has been extensively studied [15,16,17,18,19,20,21,22,23,24].…”

Section: Application I: Conditional Production Of Single Photons Fmentioning

confidence: 99%

Modelling photo-detectors in quantum optics

Rohde

Ralph

2006

Journal of Modern Optics

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Photo-detection plays a fundamental role in experimental quantum optics and is of particular importance in the emerging field of linear optics quantum computing. Present theoretical treatment of photo-detectors is highly idealized and fails to consider many important physical effects. We present a physically motivated model for photo-detectors which accommodates for the effects of finite resolution, bandwidth and efficiency, as well as dark-counts and dead-time. We apply our model to two simple well known applications, which illustrates the significance of these characteristics.

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Nonlocal Pulse Shaping with Entangled Photon Pairs

Cited by 72 publications

References 20 publications

Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection

Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection

Temporal shaping of single photons enabled by entanglement

Modelling photo-detectors in quantum optics

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