Proposal for an X-Ray Free Electron Laser Oscillator with Intermediate Energy Electron Beam

Dai, JP; Deng, Haixiao; Dai, Zhimin

doi:10.1103/physrevlett.108.034802

Cited by 55 publications

(43 citation statements)

References 26 publications

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“…However, at most two (entangled) qubits have been stored simultane-ously in a way that allowed selecting the mode mapping [15], and the scalability of the approach, which relied on encoding information into four spatial modes, to tens or hundreds of qubits and modes remains to be proven (we note related work by Lan et al [16] that, however, is not based on memories as defined above).…”

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confidence: 99%

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

et al. 2014

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Future multi-photon applications of quantum optics and quantum information science require quantum memories that simultaneously store many photon states, each encoded into a different optical mode, and enable one to select the mapping between any input and a specific retrieved mode during storage. Here we show, with the example of a quantum repeater, how to employ spectrallymultiplexed states and memories with fixed storage times that allow such mapping between spectral modes. Furthermore, using a Ti:Tm:LiNbO3 waveguide cooled to 3 Kelvin, a phase modulator, and a spectral filter, we demonstrate storage followed by the required feed-forward-controlled frequency manipulation with time-bin qubits encoded into up to 26 multiplexed spectral modes and 97% fidelity.PACS numbers: 03.67. Hk, 42.50.Ex, 32.80.Qk, 78.47.jf Further advances towards scalable quantum optics [1,2] and quantum information processing [3,4] rely on joint measurements of multiple photons that encode quantum states (e.g. qubits) [3][4][5]. However, as photons generally arrive in a probabilistic fashion, either due to a probabilistic creation process or due to loss during transmission, such measurements are inherently inefficient. For instance, this leads to exponential scaling of the time required to establish entanglement, the very resource of quantum information processing, as a function of distance in a quantum relay [6]. This problem can be overcome by using quantum memories, which are generally realized through the reversible mapping of quantum states between light and matter [7,8]. For efficient operation, these memories must be able to simultaneously store many photon states, each encoded into a different optical mode, and subsequently (using feed-forward) allow selecting the mapping between input and retrieved modes (e.g., different spectral or temporal modes). This enables making several photons arriving at a measurement device indistinguishable, thereby rendering joint measurements deterministic. For instance, revisiting the example of entanglement distribution, a quantum relay supplemented with quantum memories changes it to a repeater and, in principle, the scaling from exponential to polynomial [4,9].Interestingly, for such multimode quantum memories to be useful, it is not necessary to map any input mode onto any retrieved (output) mode, but it often suffices if a single input mode, chosen once a photon is stored, can be mapped onto a specific output mode (e.g. characterized by the photon's spectrum and recall time) [4,10]. This ensures that the photons partaking in a joint measurement, each recalled from a different quantum memory, are indistinguishable, as required, e.g., for a Bell-state measurement. We emphasize that it does not matter if the device used to store quantum states also allows the mode mapping, or if the mode mapping is performed after recall using appended devices -we will refer to the system allowing storage and mode mapping as the memory.To date, most research assumes photons arriving at different times at the m...

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confidence: 99%

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

et al. 2014

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“…With the advent of x-ray FELs in the last 10 years [2][3][4][5], a new era of x-ray science has arrived. Currently, the light source community is continuing to develop more sophisticated schemes in pursuit of, e.g., fast polarization switching [5][6][7][8][9][10][11][12][13][14][15][16][17], full coherence [18][19][20][21][22][23][24], compact x-ray configurations [25][26][27][28], and multicolor operation [29][30].…”

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confidence: 99%

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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Polarization switching of light sources is required over a wide spectral range to investigate the symmetry of matter. In this paper, we report the first experimental demonstration of the crossed-planar undulators technique at a seeded free-electron laser, which holds great promise for the full control and fast switching of the polarization of short-wavelength radiation. In the experiment, the polarization state of the coherent radiation at the second harmonic of the seed laser is switched successfully. The experimental results confirm the theory and pave the way for applying the crossed-planar undulators technique for seeded x-ray free-electron lasers.

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“…Nonlinear harmonic generation (NHG) has been studied for some time [4][5][6][7], and the expected output power at the hth harmonic is typically of the order of 10 −h times the power of the fundamental [5]. As a result, various schemes have been proposed to enhance the harmonic interactions [8][9][10][11]. In contrast to NHG, linear harmonic generation (LHG) might become important if the fundamental can be suppressed.…”

Section: Introductionmentioning

confidence: 99%

Enhanced harmonic generation in x-ray free-electron lasers

Freund

Yampolsky

Marksteiner

2014

Phys. Rev. ST Accel. Beams

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Harmonic generation becomes increasingly important as x-ray free-electron lasers push to shorter wavelengths. Recent studies have pointed to the possibility of enhancing harmonic generation by detuning the fundamental. In x-ray free-electron lasers, the wiggler line is composed of multiple wiggler segments with magnetic quadrupoles in the gaps to provide for increased focusing. In this paper, we study the effect on harmonic generation in simulation by (1) varying the gap lengths between the wiggler segments and (2) varying the electron beam β function. In studying the harmonic we find enhanced harmonic generation is periodic in the gap length and peaks are found as the wiggler separation varies by λ=3 (where λ is the fundamental wavelength), which corresponds to a phase shift of 2π=3. As a consequence, enhanced harmonic generation is found both when the fundamental emission is strong by the nonlinear harmonic generation mechanism and by linear harmonic generation when the fundamental is detuned.

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Proposal for an X-Ray Free Electron Laser Oscillator with Intermediate Energy Electron Beam

Cited by 55 publications

References 26 publications

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Enhanced harmonic generation in x-ray free-electron lasers

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