Efficient detection of an ultra-bright single-photon source using superconducting nanowire single-photon detectors

Jin, Rui-Bo; Fujiwara, Mikio; Yamashita, Taro; Miki, Shigehito; Terai, Hirotaka; Wang, Zhen; Wakui, Kentaro; Shimizu, Ryosuke; Sasaki, Masahide

doi:10.1016/j.optcom.2014.09.051

Cited by 23 publications

(22 citation statements)

References 41 publications

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“…To measure g (2) (0), in the same way as for the scheme in Ref. [39,40], we simply steer one of the outputs of the beam splitter (in Fig. 2 of the main text) to SNSPD2, and the other one to SNSPD3.…”

Section: Measurement Of the Second-order Correlation Functionmentioning

confidence: 99%

Experimental Quantum Switching for Exponentially Superior Quantum Communication Complexity

et al. 2019

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Finding exponential separation between quantum and classical information tasks is like striking gold in quantum information research. Such an advantage is believed to hold for quantum computing but is proven for quantum communication complexity. Recently, a novel quantum resource called the quantum switch-which creates a coherent superposition of the causal order of events, known as quantum causality-has been harnessed theoretically in a new protocol providing provable exponential separation. We experimentally demonstrate such an advantage by realizing a superposition of communication directions for a two-party distributed computation. Our photonic demonstration employs d-dimensional quantum systems, qudits, up to d = 2 13 dimensions and demonstrates a communication complexity advantage, requiring less than (0.696 ± 0.006) times the communication of any causally ordered protocol. These results elucidate the crucial role of the coherence of communication direction in achieving the exponential separation for the one-way processing task, and open a new path for experimentally exploring the fundamentals and applications of advanced features of indefinite causal structures.Computation by separated parties with minimal communication is the focus of communication complexity, which has applications to distributed computing, very-large-scale integration, streaming algorithms, and more [1]. For quantum information, communication complexity is especially exciting as exponential quantum-classical gaps can be proven [2][3][4][5][6][7][8][9]. By contrast, exponential quantum-classical gaps for computation tasks such as factorization [10] depend on the best-known classical algorithm, and thus are strongly believed but not rigorously proven. Experimentally, quantum communication complexity has been studied in proof of principle for the quantum fingerprinting protocol [11][12][13] and beyond [1,14,15].The quantum switch provides a new communication complexity tool that leads to another instance of exponential quantum advantage [16]. The quantum switch is a device where a control qubit determines the order in which two transformations are performed on a target system [17,18]. When the control is in a superposition of logical states, the order of the operations is causally indefinite; i.e., there is a superposition of the ordering of target operations. The quantum switch has broad relevance in the context of quantum causality [19] including applications to studies of quantum gravity [19][20][21][22], communication complexity [16, * These authors contributed equally to this work.2 23], witnessing causality [17,[24][25][26][27][28] and deciding whether a given indefinite causal order is physical [29,30]. In quantum computing, the quantum switch can reduce the query complexity for some tasks compared to causally ordered protocols [18,31] -this advantage has been demonstrated for single-qubit control and single-qubit target circuits [32]. In quantum communication, the quantum switch enhances the communication rate beyond the limits of ...

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Section: Measurement Of the Second-order Correlation Functionmentioning

confidence: 99%

Experimental Quantum Switching for Exponentially Superior Quantum Communication Complexity

et al. 2019

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“…To obtain the experimental data in a reasonable time, we adopted a high pump power of 400 mW for the six-photon interference. The mean photon numbers at different pump powers were about 0.04 (30 mW), 0.067 (50 mW), 0.15 (100 mW) and 0.64 (400 mW) respectively and the multi-pair components in our PPKTP source as a function of pump power were investigated in our previous work31.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Thanks to the GVM condition, the spectral purity is much higher at telecom wavelength than that at visible wavelengths39. The multi-pair components in our PPKTP source as a function of pump power were investigated in our previous work31.…”

Section: Methodsmentioning

confidence: 99%

Detection-dependent six-photon Holland-Burnett state interference

Jin

Fujiwara

Shimizu

et al. 2016

Sci Rep

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The NOON state, and its experimental approximation the Holland-Burnett state, have important applications in phase sensing measurement with enhanced sensitivity. However, most of the previous Holland-Burnett state interference (HBSI) experiments only investigated the area of the interference pattern in the region immediately around zero optical path length difference, while the full HBSI pattern over a wide range of optical path length differences has not yet been well explored. In this work, we experimentally and theoretically demonstrate up to six-photon HBSI and study the properties of the interference patterns over a wide range of optical path length differences. It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes. This work paves the way for applications which are based on the envelope of the HBSI pattern, such as quantum spectroscopy and quantum metrology.

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“…The CSI is reconstructed by analyzing the arrival time of the photon pairs in Ch1 and Ch2. Each CSI data set was accumulated only for 5 seconds, thanks to our highly efficient fiber spectrometer that is constituted of high-efficiency SNSPDs (see Methods) [29][30][31]. The peak numbers in the ToA data in the first row of figure 3 correspond well to the discrete mode numbers in the diagram w w ( ) , figure 3(f.2), the correlation diagram does not show any mode structure due to our limited timing resolution.…”

Section: Methodsmentioning

confidence: 99%

“…The SNSPDs have a system detection efficiency (SDE) of around 70% with a dark count rate (DCR) less than 1 kcps. The SNSPD also has a wide spectral response range [31]. The measured timing jitter and dead time (recovery time) were 68 ps [29] and 40 ns [43].…”

Section: The Snspdsmentioning

confidence: 99%

Simple method of generating and distributing frequency-entangled qudits

Jin

Shimizu

Fujiwara

et al. 2016

Quantum Sci. Technol.

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High-dimensional, frequency-entangled photonic quantum bits (qudits for d-dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudts with > d 10 without the use of any spectral filters or cavities. The generated state is distributed over 15 km in total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.

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Efficient detection of an ultra-bright single-photon source using superconducting nanowire single-photon detectors

Cited by 23 publications

References 41 publications

Experimental Quantum Switching for Exponentially Superior Quantum Communication Complexity

Experimental Quantum Switching for Exponentially Superior Quantum Communication Complexity

Detection-dependent six-photon Holland-Burnett state interference

Simple method of generating and distributing frequency-entangled qudits

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