Physical review. A/Physical review, A, Journal Year: 2023, Volume and Issue: 107(5)
Published: May 30, 2023
The authors investigate the dimensionality of photonic quantum entanglement distributed through a 10.2-km atmospheric link connecting building in center Vienna to distant laboratory Bisamberg. An atypical approach time-bin encoding was employed analyze data. results show that data cannot be explained by qubits alone, indicating presence high-dimensional system.
Language: Английский
Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)
Published: March 4, 2022
Abstract Controlling and programming quantum devices to process information by the unit of dit, i.e., qudit, provides possibilities for noise-resilient communications, delicate molecular simulations, efficient computations, showing great potential enhance capabilities qubit-based technologies. Here, we report a programmable qudit-based processor in silicon-photonic integrated circuits demonstrate its enhancement computational parallelism. The monolithically integrates all key functionalities initialisation, manipulation, measurement two quart (ququart) states multi-value quantum-controlled logic gates with high-level fidelities. By reprogramming configuration processor, implemented most basic Fourier transform algorithms, quaternary, benchmark parallelism using qudits, which include generalised Deutsch-Jozsa Bernstein-Vazirani quaternary phase estimation fast factorization algorithms. monolithic integration high programmability have allowed implementations more than one million high-fidelity preparations, operations projections qudit processor. Our work shows an photonic technology computing enhanced capacity, accuracy, efficiency, could lead acceleration building large-scale computer.
Language: Английский
Citations
180
Physical Review Letters, Journal Year: 2020, Volume and Issue: 125(23)
Published: Dec. 2, 2020
Quantum teleportation provides a way to transmit unknown quantum states from one location another. In the world, multilevel systems which enable high-dimensional are more prevalent. Therefore, completely rebuild of single particle remotely, needs teleport (high-dimensional) states. Here, we demonstrate in three-dimensional six-photon system. We exploit spatial mode photon as system, use two auxiliary entangled photons realize deterministic Bell state measurement. The fidelity process matrix is F=0.596\pm0.037. Through this matrix, can prove that our both nonclassical and genuine three dimensional. Our work paves complex remotely construct networks.
Language: Английский
Citations
174
Opto-Electronic Advances, Journal Year: 2022, Volume and Issue: 5(6), P. 210174 - 210174
Published: Jan. 1, 2022
The interest in tailoring light all its degrees of freedom is steadily gaining traction, driven by the tremendous developments toolkit for creation, control and detection what now called structured light. Because complexity these optical fields generally understood terms interference, tools have historically been linear elements that create desired superpositions. For this reason, despite long impressive history nonlinear optics, only recently has spatial structure processes come to fore. In review we provide a concise theoretical framework understanding optics context light, offering an overview perspective on progress made, challenges remain.
Language: Английский
Citations
86
Advances in Optics and Photonics, Journal Year: 2024, Volume and Issue: 16(1), P. 60 - 60
Published: Feb. 22, 2024
Entanglement is a quintessential quantum mechanical phenomenon with no classical equivalent. First discussed by Einstein, Podolsky, and Rosen formally introduced Schrödinger in 1935, entanglement has grown from scientific debate to radically new resource that sparks technological revolution. This review focuses on fundamentals recent advances entanglement-based information technology (QIT), specifically photonic systems. Photons are unique carriers several advantages, such as their ability operate at room temperature, compatibility existing communication sensing infrastructures, the availability of readily accessible optical components. also interface well other solid-state platforms. We first provide an overview entanglement, starting introduction its development historical perspective followed theory for generation associated representative experiments. then dive into applications QIT sensing, imaging, spectroscopy, data processing, communication. Before closing, we present outlook architecture next-generation prospective applications.
Language: Английский
Citations
21
Advanced Quantum Technologies, Journal Year: 2021, Volume and Issue: 4(5)
Published: March 22, 2021
Abstract Entangled photon sources are desirable and key elements for photonic quantum information processing. The spontaneous parametric down‐conversion (SPDC) process is a convenient way to produce entangled pairs. It has been widely used already made great contributions science. SPDC have thoroughly studied, detailed review, previously lacking, now appropriate. In this article, different types of suitable multiphoton experiments reviewed. A comparison their respective performances presented, focusing on the parameters indistinguishability, collection efficiency, brightness, from which it possible see how spatial spectral properties can be tailored, step by step, achieve near‐perfect Recent progress multiplexed heralded single‐photon sources, effectively mitigate nondeterministic nature process, also described.
Language: Английский
Citations
67
Quantum, Journal Year: 2022, Volume and Issue: 6, P. 695 - 695
Published: April 25, 2022
Entanglement shared among multiple parties presents complex challenges for the characterisation of different types entanglement. One most fundamental insights is fact that some mixed states can feature entanglement across every possible cut a multipartite system yet be produced via mixture separable with respect to partitions. To distinguish genuinely cannot from mixing such partition-separable states, term genuine was coined. All these considerations originate in paradigm where only single copy state distributed and locally acted upon. In contrast, advances quantum technologies prompt question how this picture changes when copies same become accessible. Here we show unlock partially i.e., mixtures even undistillable ensembles, more than two required observe effect. With findings, characterise notion conjecture strict hierarchy activatable an asymptotic collapse hierarchy.
Language: Английский
Citations
51
Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 16, 2025
Abstract Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use of the same dimension as channel because this allows for unitary encodings, which preserve global coherence until measurement performed. Contrasting this, distributed task based on qubit demonstrated, irreversible encoding operations outperform any possible coherence‐preserving protocol. This corresponds using high‐dimensional and information by compressing one subsystems into qubit. Demonstrating phenomenon requires preparation 4D maximally entangled state, compression two qubits joint qubit‐ququart measurements, with all modules executed at near‐optimal fidelity. proof‐of‐principle experiment reported that achieves advantage realizing separate in distinct independently controlled paths single photon. result demonstrates relevance non‐unitary enhancing communication capabilities standard transmissions.
Language: Английский
Citations
1
Chinese Journal of Physics, Journal Year: 2025, Volume and Issue: unknown
Published: March 1, 2025
Language: Английский
Citations
1
Advanced Quantum Technologies, Journal Year: 2021, Volume and Issue: 4(9)
Published: July 13, 2021
Quantum coherence is a fundamental property of quantum systems, separating from classical physics. Recently, there has been significant interest in the characterization as resource, investigating how can be extracted and used for technological applications. In this work we review progress research, focusing particular on recent experimental efforts. After brief underlying theory discuss main platforms realizing experiments: linear optics, nuclear magnetic resonance, superconducting systems. We then consider detection quantification coherence, state conversion distillation, experiments dynamics coherence. also exploring connections between uncertainty relations, path information, operations measurements. Experimental efforts multipartite multilevel are discussed.
Language: Английский
Citations
55
Quantum, Journal Year: 2020, Volume and Issue: 4, P. 376 - 376
Published: Dec. 24, 2020
Photons offer the potential to carry large amounts of information in their spectral, spatial, and polarisation degrees freedom. While state-of-the-art classical communication systems routinely aim maximize this information-carrying capacity via wavelength spatial-mode division multiplexing, quantum based on multi-mode entanglement usually suffer from low state quality, long measurement times, limited encoding capacity. At same time, certification methods often rely assumptions that compromise security. Here we show photonic high-dimensional transverse position-momentum degree-of-freedom with a record speed, dimensionality, without making any about or channels. Using tailored macro-pixel basis, precise measurements, modified witness, demonstrate fidelities up 94.4% 19-dimensional state-space, 55 local dimensions, an entanglement-of-formation 4 ebits. Furthermore, our times improvement more than two orders magnitude over previous demonstrations. Our results pave way for noise-robust networks saturate single photons.
Language: Английский
Citations
51