Up-conversion of optical signals with multi-longitudinal-mode pump lasers

Pelc, Jason S.; Shentu, Guo-Liang; Zhang, Q.; Fejer, M. M.; Pan, Jian-Wei

doi:10.1103/physreva.86.033827

Cited by 10 publications

(15 citation statements)

References 18 publications

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“…The scheme was suggested for mode-resolved photon counting (MRPC) applications. Additionally, there are other schemes using multimode pumps that have also been used for manipulation of photonic signals [30,31].…”

Section: The Building Blocksmentioning

confidence: 99%

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Manurkar

Jain

Silver

et al. 2016

Optica

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Quantum frequency conversion (QFC) of photonic signals preserves quantum information while simultaneously changing the signal wavelength. A common application of QFC is to translate the wavelength of a signal compatible with the current fiber-optic infrastructure to a shorter wavelength more compatible with high quality single-photon detectors and optical memories. Recent work has investigated the use of QFC to manipulate and measure specific temporal modes (TMs) through tailoring of the pump pulses. Such a scheme holds promise for multidimensional quantum state manipulation that is both low loss and re-programmable on a fast time scale. We demonstrate the first QFC temporal mode sorting system in a four-dimensional Hilbert space, achieving a conversion efficiency and mode separability as high as 92% and 0.84, respectively. A 20-GHz pulse train is projected onto 6 different TMs, including superposition states, and mode separability with weak coherent signals is verified via photon counting. Such ultrafast high-dimensional photonic signals could enable long-distance quantum communication with high rates.© [2016] [Optical Society of America] One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. MotivationLong distance quantum-optical communication is indispensable to several applied quantum technologies, such as quantum cryptography [1,2], quantum teleportation [3], and distributed quantum computation [4,5]. It also plays a vital role in the verification of fundamental tenets of physics such as tests of Bell nonlocality [6,7] and relativistic quantum information [8].Ultrafast pulses [9] produced by optical frequency combs (OFCs) with combline spacing in the 10 − 100 GHz regime routinely enable classical communication tasks such as optical networking and signal processing [10][11][12]. Their rich spectral mode structure also offers high-capacity quantum information encoding via multimode quantum states. Availability of sources and tools to exercise control over the mode structure at the transmitter, low loss and noise conditions during propagation through the optical channel, and high mode-separability and detection efficiency at the receiver then become the requisites for large-throughput quantum communication over long distances.One of the most extensively studied sources for high-dimensional information coding at the quantum level are the temporal modes (TMs) of ultrafast quantum states [13,14]. They are typically obtained by carefully engineering the process of spontaneous parametric down conversion (SPDC) or four wave mixing in nonlinear media [15][16][17]. If produced in the telecom wavelength regime, and in a spatial mode compatible with fibers, such multimode quantum signals are also easily integrable with the fiber-optic infrastructure. This ensures that the loss and noise incurred in propagation over lon...

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Section: The Building Blocksmentioning

confidence: 99%

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Manurkar

Jain

Silver

et al. 2016

Optica

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“…However, the situation is more complicated when several spatial (or axial [40]) modes are involved. Indeed, our waveguides are multimode at 854 nm and a fraction of 854 nm populates higher-order modes due to imperfect mode matching at the input.…”

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confidence: 99%

Polarisation-preserving photon frequency conversion from a trapped-ion-compatible wavelength to the telecom C-band

et al. 2017

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Given the great success in encoding, manipulating, storing and reading-out quantum information in their electronic states, trapped atomic ions represent a powerful platform with which to build, or integrate into, the nodes of quantum networks [5,6]. Indeed, an elementary quantum network consisting of ions in two traps a few meters apart, has been entangled via travelling ultraviolet photons [7]. A challenge is that most readily-accessible photonic transitions in trapped ions lie at wavelengths that suffer significant absorption loss in materials for manipulating and guiding light, thereby limiting the internode networking distance. Another challenge is that ionic transitions are fixed and narrowband, such that, except in rare cases [8], they cannot be interfaced with other examples of quantum matter to enable new ion-hybrid quantum systems [9]. Note that frequency-distinguishable quantum systems can be linked via their photons, though at the cost of reducing the efficiency of making that link [10].The aforementioned challenges could be overcome using quantum frequency conversion (QFC) [11,12]; a nonlinear optical process in which a photon of one frequency is converted to another, whilst preserving all the quantum and classical photon properties. QFC of single photons has recently been studied in a variety of contexts [13][14][15][16][17][18] and is typically achieved using three-wave mixing in a secondorder non-linear ( 2 ) crystal. It has been shown that QFC can preserve a broad range of photon properties, including first-and second-order coherence, and pre-existing photonphoton entanglement [12,19,20]. QFC could, therefore, act as a quantum photonic adapter for trapped ions, allowing their high-energy photonic transitions to be interfaced with the lower-energy photons better suited for long-distance travel through optical fibers, or with other forms of quantum matter.Interfacing trapped ions with the telecom wavelengths of 1310 nm (O band) or 1550 nm (C band) is particularly Abstract We demonstrate polarisation-preserving frequency conversion of single-photon-level light at 854 nm, resonant with a trapped-ion transition and qubit, to the 1550-nm telecom C band. A total photon in / fiber-coupled photon out efficiency of ∼30% is achieved, for a free-running photon noise rate of ∼60 Hz. This performance would enable telecom conversion of 854 nm polarisation qubits, produced in existing trapped-ion systems, with a signal-to-noise ratio greater than 1. In combination with near-future trappedion systems, our converter would enable the observation of entanglement between an ion and a photon that has travelled more than 100 km in optical fiber: three orders of magnitude further than the state-of-the-art.

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“…In comparison to a linear laser cavity used in the CO 2 lidar UCD, the ring design enables single longitudinal mode lasing. At high pump power levels, single mode operation of the ring laser improves upconversion efficiency [19]. Furthermore, unwanted noise due to multimode pumping [18] is avoided.…”

Section: Signal-to-noise Ratiomentioning

confidence: 99%

Upconversion detector for range-resolved DIAL measurement of atmospheric CH₄

et al. 2018

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We demonstrate a robust, compact, portable and efficient upconversion detector (UCD) for a differential absorption lidar (DIAL) system designed for range-resolved methane (CH) atmospheric sensing. The UCD is built on an intracavity pump system that mixes a 1064 nm pump laser with the lidar backscatter signal at 1646 nm in a 25-mm long periodically poled lithium niobate crystal. The upconverted signal at 646 nm is detected by a photomultiplier tube (PMT). The UCD with a noise equivalent power around 127 fW/Hz outperforms a conventional InGaAs based avalanche photodetector when both are used for DIAL measurements. Using the UCD, CH DIAL measurements have been performed yielding differential absorption optical depths with relative errors of less than 11% at ranges between 3 km and 9 km.

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Up-conversion of optical signals with multi-longitudinal-mode pump lasers

Cited by 10 publications

References 18 publications

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Polarisation-preserving photon frequency conversion from a trapped-ion-compatible wavelength to the telecom C-band

Upconversion detector for range-resolved DIAL measurement of atmospheric CH₄

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Up-conversion of optical signals with multi-longitudinal-mode pump lasers

Cited by 10 publications

References 18 publications

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Multidimensional mode-separable frequency conversion for high-speed quantum communication

Polarisation-preserving photon frequency conversion from a trapped-ion-compatible wavelength to the telecom C-band

Upconversion detector for range-resolved DIAL measurement of atmospheric CH4

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Upconversion detector for range-resolved DIAL measurement of atmospheric CH₄