Approaching optimal entangling collective measurements on quantum computing platforms

Conlon, Lorcán O.; Vogl, Tobias; Marciniak, Christian D.; Pogorelov, Ivan; Yung, Simon K.; Eilenberger, Falk; Berry, Dominic W.; Santana, Fabiana Soares; Blatt, R.; Monz, Thomas; Lam, Ping Koy; Assad, Syed M.

doi:10.1038/s41567-022-01875-7

Cited by 34 publications

(24 citation statements)

References 61 publications

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“…The emission process was found to be radiation-tolerant, i.e., hBN quantum emitters can operate in space environments [41]. Single photons emitted from hBN have been utilized for use in quantum information processing [42,43], for extended quantum theory tests [18], and quantum key distribution [44]. The integration of hBN emitters with glass fibers where the emitter was placed onto the fiber facet has been demonstrated already [45].…”

Section: Quantum Photonics Modulementioning

confidence: 99%

QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space

Ahmadi¹,

Schwertfeger²,

Werner³

et al. 2023

Preprint

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Modern quantum technologies have matured such that they can now be used in space applications, e.g., long-distance quantum communication. Here, we present the design of a compact true single photon source that can enhance the secure data rates in satellite-based quantum key distribution scenarios compared to conventional laser-based light sources. Our quantum light source is a fluorescent color center in hexagonal boron nitride. The emitter is off-resonantly excited by a diode laser and directly coupled to an integrated photonic processor that routes the photons to different experiments performed directly on-chip: (i) the characterization of the single photon source and (ii) testing a fundamental postulate of quantum mechanics, namely the relation of the probability density and the wave function (known as Born's rule). The described payload is currently being integrated into a 3U CubeSat and scheduled for launch in 2024 into low Earth orbit. We can therefore evaluate the feasibility of true single photon sources and reconfigurable photonic circuits in space. This provides a promising route toward a high-speed quantum network.

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Section: Quantum Photonics Modulementioning

confidence: 99%

QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space

Ahmadi¹,

Schwertfeger²,

Werner³

et al. 2023

Preprint

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“…Quantum emitters in solid-state crystals have garnered considerable attention, driven by the rapid advancement of quantum technology applications such as quantum computing, quantum communication, and quantum sensing. − The discovery of quantum emitters based on defects in wide bandgap materials has significantly advanced this field. − Quantum emitters have been used in a wide variety of applications, most prominently in magnetometry and imaging, , but also in quantum key distribution, , fundamental quantum physics tests, thermometry, pressure sensing, quantum computing, quantum memories, − and as nodes in a quantum network …”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Quantum Emitter Fabrication in Wide Bandgap Materials Using Localized Electron Irradiation

Kumar,

Cholsuk,

Mishuk

et al. 2024

ACS Appl. Opt. Mater.

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Quantum light sources are crucial foundational components for various quantum technology applications. With the rapid development of quantum technology, there has been a growing demand for materials with the capability of hosting quantum emitters. One such material platform uses fluorescent defects in hexagonal boron nitride (hBN) that can host deep sublevels within the bandgap. The localized electron irradiation has shown its effectiveness in generating deep sublevels to induce single emitters in hBN. The question is whether localized (electron beam) irradiation is a reliable tool for creating emitters in other wide bandgap materials and its uniqueness to hBN. Here, we investigate and compare the fabrication of quantum emitters in hBN and exfoliated muscovite mica flakes along with other 3D crystals, such as silicon carbide and gallium nitride, which are known to host quantum emitters. We used our primary fabrication technique of localized electron irradiation using a standard scanning electron microscope. To complement our experimental work, we employed density functional theory simulations to study the atomic structures of defects in mica. While our fabrication technique allows one to create hBN quantum emitters with a high yield and high single photon purity, it is unable to fabricate single emitters in the other solid-state crystals under investigation. This allows us to draw conclusions on the emitter fabrication mechanism in hBN, which could rely on activating pre-existing defects by charge state manipulation. Therefore, we provide an essential step toward the identification of hBN emitters and their formation process.

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“…Recently, major breakthroughs toward outstanding performance in computation, communication, and sensing by leveraging quantum properties have been demonstrated. Although many quantum systems are still under ongoing investigation [1][2][3][4][5][6][7], quantum computers [8,9] have potentially performed tasks or measurements, that cannot be done classically, e.g., in quantum sensing [10,11], quantum communication [12,13], and interferometry [14].…”

Section: Introductionmentioning

confidence: 99%

“…Quantum algorithms in particular have been expedited to overcome the boundary of the problems unsolvable by classical computation [10,15,16] and also speed up classical algorithms [17][18][19]. Recent accomplishments in wave physics have e.g.…”

Section: Introductionmentioning

confidence: 99%

Efficient light propagation algorithm using quantum computers

Cholsuk,

Davani,

Conlon

et al. 2024

Phys. Scr.

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Quantum algorithms can potentially overcome the boundary of computationally hard problems. One of the cornerstones in modern optics is the beam propagation algorithm, facilitating the calculation of how waves with a particular dispersion relation propagate in time and space. This algorithm solves the wave propagation equation by Fourier transformation, multiplication with a transfer function, and subsequent back transformation. This transfer function is determined from the respective dispersion relation, which can often be expanded as a polynomial. In the case of paraxial wave propagation in free space or picosecond pulse propagation, this expansion can be truncated after the quadratic term. The classical solution to the wave propagation requires $\mathcal{O}(N log N)$ computation steps, where $N$ is the number of points into which the wave function is discretized. Here, we show that the propagation can be performed as a quantum algorithm with $\mathcal{O}((log{}N)^2)$ single-controlled phase gates, indicating exponentially reduced computational complexity. We herein demonstrate this quantum beam propagation method (QBPM) and perform such propagation in both one- and two-dimensional systems for the double-slit experiment and Gaussian beam propagation. We highlight the importance of the selection of suitable observables to retain the quantum advantage in the face of the statistical nature of the quantum measurement process, which leads to sampling errors that do not exist in classical solutions.

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Approaching optimal entangling collective measurements on quantum computing platforms

Cited by 34 publications

References 61 publications

QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space

QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space

Comparative Study of Quantum Emitter Fabrication in Wide Bandgap Materials Using Localized Electron Irradiation

Efficient light propagation algorithm using quantum computers

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