High-performance reconfigurable coincidence counting unit based on a field programmable gate array

Park, Byung Kwon; Kim, Yong‐Su; Kwon, Oh‐Min; Han, Sang-Wook; Moon, Sung

doi:10.1364/ao.54.004727

Cited by 27 publications

(16 citation statements)

References 22 publications

(18 reference statements)

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“…During the experiment, we have measured and compensated the phase drift every 10 minutes. Finally, single photons are detected by avalanche photodiodes D1 and D2 and two-fold coincidences between the trigger detector D0 and D1 or D2, D01 and D02 are registered using a home-made coincidence counting unit (CCU) [42,43]. The optical setup of the VQE experiment is tested with the ability to generate and measure arbitrary four-dimensional quantum states with high purity, 𝑃 > 0.98.…”

Section: Methodsmentioning

confidence: 99%

Error-mitigated photonic variational quantum eigensolver using a single-photon ququart

Lee¹,

Lee²,

Hong³

et al. 2021

Preprint

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We report the experimental resource-efficient implementation of the variational quantum eigensolver (VQE) using four-dimensional photonic quantum states of single-photons. The four-dimensional quantum states are implemented by utilizing polarization and path degrees of freedom of a single-photon. Our photonic VQE is equipped with the quantum error mitigation (QEM) protocol that efficiently reduces the effects of Pauli noise in the quantum processing unit. We apply our photonic VQE to estimate the ground state energy of He-H + cation. The simulation and experimental results demonstrate that our resource-efficient photonic VQE can accurately estimate the bond dissociation curve, even in the presence of large noise in the quantum processing unit.

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Section: Methodsmentioning

confidence: 99%

Error-mitigated photonic variational quantum eigensolver using a single-photon ququart

Lee¹,

Lee²,

Hong³

et al. 2021

Preprint

Self Cite

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“…The polarization states of the three qubit particles were reconstructed by quantum state tomography (QST) using sets of HWP, QWP, and polarizing beamsplitters (PBS) in front of the single-photon detectors. The four-fold coincidence counts including a trigger photon are registered by a home-made coincidence counting unit (CCU) [42,43].…”

Section: A Ghz Classmentioning

confidence: 99%

Entangling three identical particles via spatial overlap

Lee¹,

Pramanik²,

Cho³

et al. 2021

Preprint

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Quantum correlations between identical particles are at the heart of quantum technologies. Recently, particle identity has drawn strong attention as an essential resource for generating entanglement. Several studies with two identical particles have shown that the spatial overlap and indistinguishability between the particles are necessary for generating bipartite entanglement. On the other hand, researches on the extension to more than two-particle systems are limited by the practical difficulty to deal with multiple identical particles in laboratories. In this work, we propose schemes to generate two fundamental classes of genuine tripartite entanglement, i.e., GHZ and W classes, which are experimentally demonstrated with three identical photons. We also show that the tripartite entanglement class decays from the genuine entanglement to the full separability as the particles become more distinguishable from each other. Our results support the prediction that particle indistinguishability is a fundamental element for entangling identical particles.

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“…Thus, low-cost FPGA designs have focused on reducing this parameter with a sequential architecture, where a high speed internal clock is required to improve the resolution of τ , limiting its width to a few nanoseconds [11], [12]. On the other hand, low-cost architectures based on logic gates (combinational coincidence evaluation) have been proposed as coincidence counters by reducing τ to few tens of nanoseconds [13], then improving to sub nanosecond resolution using external circuits [14]. FPGAs using sequential architectures are capable to acquire and transmit electronic signals in the nanosecond regime [15]- [17], integrating arithmetic processes, and providing flow control over different clocks within a single integrated circuit (IC) [18], [19], even being used to manage different quantum information systems, such as quantum routing [20], [21], quantum random generation [22], [23], and quantum key distribution [24]- [26].…”

Section: Introductionmentioning

confidence: 99%

Post-Measurement Adjustment of the Coincidence Window in Quantum Optics Experiments

et al. 2021

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We report on an electronic coincidence detection circuit for quantum photonic applications implemented on a field-programmable gate array (FPGA), which records each the time separation between detection events coming from single-photon detectors. We achieve a coincidence window as narrow as 500 ps with a series of optimizations on a readily-available and affordable FPGA development board. Our implementation allows real-time visualization of coincidence measurements for multiple coincidence window widths simultaneously. To demonstrate the advantage of our high-resolution visualization, we certified the generation of polarized entangled photons by collecting data from multiple coincidence windows with minimal accidental counts, obtaining a violation of the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality by more than 338 standard deviations. Our results have shown the applicability of our electronic design in the field of quantum information.

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High-performance reconfigurable coincidence counting unit based on a field programmable gate array

Cited by 27 publications

References 22 publications

Error-mitigated photonic variational quantum eigensolver using a single-photon ququart

Error-mitigated photonic variational quantum eigensolver using a single-photon ququart

Entangling three identical particles via spatial overlap

Post-Measurement Adjustment of the Coincidence Window in Quantum Optics Experiments

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