Measurement-Device-Independent Verification of Quantum Channels

Graffitti, Francesco; Pickston, Alexander; Barrow, Peter; Proietti, Massimiliano; Kundys, Dmytro; Rosset, Denis; Ringbauer, Martin; Fedrizzi, Alessandro

doi:10.1103/physrevlett.124.010503

Cited by 17 publications

(10 citation statements)

References 33 publications

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“…A growing number of quantum technologies rely on low temperature operation at 10 mK-1 K. For instance, the recent demonstration of quantum supremacy with a quantum computer based on superconducting qubits 1,2 relied on decades of development of superconducting devices at mK temperatures. Similarly, superconducting nanowire single photon detectors are now widely used for applications ranging from quantum sensing 3,4 to quantum networking [5][6][7][8][9] because they offer a combination of high-speed, high quantum efficiency, and low dark-count-rate single photon detection at spectral bands beyond those covered by conventional semiconducting detectors and temperatures of order 1 K 10,11 . Transition edge sensors operated at mK temperatures offer photon number resolution that is critical to fundamental tests of quantum information [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Free-space confocal magneto-optical spectroscopies at milliKelvin temperatures

Lawrie

Feldman

Marvinney

et al. 2021

Preprint

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We describe the operation of a free-space confocal optical microscope operated in a dilution refrigerator. The microscope is installed on a cold insertable probe to enable fast sample exchange while the refrigerator is held at low temperatures. A vector magnet provides a 6 T field normal to the sample and 1 T fields at arbitrary angles. A variety of optical microscopies and spectroscopies, including photoluminescence, Raman, magneto-optical Kerr effect, and spin relaxometry measurements are described, and some of the challenges associated with performing these measurements at milliKelvin temperatures are explored.

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Section: Introductionmentioning

confidence: 99%

Free-space confocal magneto-optical spectroscopies at milliKelvin temperatures

Lawrie

Feldman

Marvinney

et al. 2021

Preprint

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“…In the field of quantum information, theories based on quantum mechanics have many interesting developments [1][2][3][4][5][6][7][8]. The preparation and measurement [9][10][11][12] of entangled states are important in practical applications [13,14].…”

Section: Introductionmentioning

confidence: 99%

One-step direct measurement of the entangled W states with cross-Kerr nonlinearity

et al. 2021

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We propose a scheme to directly measure the entangled W states with cross-Kerr nonlinearity mediums. This scheme can measure three-photon, four-photon, and even N-photon W states in one step. Only PBSs and cross-Kerr nonlinearity mediums are used in this scheme, which is feasible for experiments. We describe the three-photon W states measurement process and extend it to four-photon and N-photon W states.

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“…Nevertheless, not all non-EB channels can be certified with channel steering. Later, the temporal semi-nonlocal game was proposed to witness "all" non-EB channels under the framework of a resource theory of quantum memories [38,46]. This is done by expanding the concept of measurement-device-independent quantum information tasks into the temporal domain [47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Quantifying Quantumness of Channels Without Entanglement

Ku,

Kadlec,

Černoch

et al. 2021

Preprint

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Quantum channels which break entanglement, incompatibility, or nonlocality are not useful for entanglementbased, one-sided device-independent, or device-independent quantum information processing, respectively. Here, we show that such breaking channels are related to certain temporal quantum correlations: temporal separability, channel unsteerability, temporal unsteerability, and macrorealism. More specifically, we first define the steerability-breaking channel, which is conceptually similar to the entanglement and nonlocality-breaking channels and prove that it is identical to the incompatibility-breaking channel. Similar to the hierarchy relations of the temporal and spatial quantum correlations, the hierarchy of non-breaking channels is discussed. We then introduce the concept of the channels which break temporal correlations, explain how they are related to the standard breaking channels, and prove the following results: (1) A certain measure of temporal nonseparability can be used to quantify a non-entanglement-breaking channel in the sense that the measure is a restricted memory monotone under the framework of the resource theory of the quantum memory. (2) A non-steerabilitybreaking channel can be certified with channel steering because the steerability-breaking channel is equivalent to the incompatibility-breaking channel. (3) The temporal steerability and non-macrorealism can respectively distinguish the steerability-breaking and the nonlocality-breaking unital channel with their corresponding nonbreaking channels. Finally, a two-dimensional depolarizing channel is experimentally implemented as a proofof-principle example to compare the temporal quantum correlations with non-breaking channels.

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Measurement-Device-Independent Verification of Quantum Channels

Cited by 17 publications

References 33 publications

Free-space confocal magneto-optical spectroscopies at milliKelvin temperatures

Free-space confocal magneto-optical spectroscopies at milliKelvin temperatures

One-step direct measurement of the entangled W states with cross-Kerr nonlinearity

Quantifying Quantumness of Channels Without Entanglement

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