Device-independent randomness expansion with entangled photons

Shalm, Lynden K.; Zhang, Yanbao; Bienfang, Joshua C.; Schlager, Collin; Stevens, Martin J.; Mazurek, Michael D.; Abellán, Carlos; Amaya, Waldimar; Mitchell, Morgan W.; Alhejji, Mohammad A.; Fu, Honghao; Ornstein, Joel; Mirin, Richard P.; Nam, Sae Woo; Knill, Emanuel

doi:10.1038/s41567-020-01153-4

Cited by 67 publications

(59 citation statements)

References 24 publications

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“…In this type of device, single photon technologies are used for producing random numbers. Typical approaches include splitting a single photon on a beam splitter [46], measuring the time of arrival of a single photon on a single photon detector [47], or measuring entangled particles [48]. -Continuous variable approaches.…”

Section: Technological Description and State Of The Artmentioning

confidence: 99%

“…A typical scenario for such fully CR protocol is a loophole-free Bell test, in which one can derive statistics by processing the input and output data with minimal characterization of the hardware. This allows randomness expansion with no component modelling at all, known as device-independent randomness extraction because the entropy estimator refers only to the challenge and response data [48], and not to any device parameters [55]. -Mixed VPM/challenge-response protocols (VPM/CRP): Fully CRP schemes require large infrastructure and are therefore hard to implement in practice.…”

Section: Technological Description and State Of The Artmentioning

confidence: 99%

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Quantum technologies in the telecommunications industry

Martín

Brito

Escribano

et al. 2021

EPJ Quantum Technol.

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Quantum based technologies have been fundamental in our world. After producing the laser and the transistor, the devices that have shaped our modern information society, the possibilities enabled by the ability to create and manipulate individual quantum states opens the door to a second quantum revolution. In this paper we explore the possibilities that these new technologies bring to the Telecommunications industry.

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Section: Technological Description and State Of The Artmentioning

confidence: 99%

Section: Technological Description and State Of The Artmentioning

confidence: 99%

Quantum technologies in the telecommunications industry

Martín

Brito

Escribano

et al. 2021

EPJ Quantum Technol.

Self Cite

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“…Or take cryptography -the importance of which in the modern world is hard to understate: it has randomness at its very core, where information is secured by the use of a random key. Now, writing in Nature Physics, two groups, Lynden Shalm and colleagues 1 and Wen-Zhao Liu and colleagues 2 , have used quantum non-locality to produce a net gain of extremely secure randomness.…”

Section: Paul Skrzypczykmentioning

confidence: 99%

Predictably random

Skrzypczyk

2021

Nat. Phys.

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“…[ 48–50 ] So far, only a few experiments succeeded in realizing a loophole‐free violation of Bell inequalities and even further fully DI quantum information processing tasks. [ 51–60 ] Besides, not all entangled states can violate a Bell inequality. [ 61,62 ] Therefore, the entangled states that violate no Bell inequalities cannot be witnessed in a DI manner.…”

Section: Introductionmentioning

confidence: 99%

Estimating Coherence Measures with Untrusted Devices

2021

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The superposition of quantum states, quantified by coherence, is a fundamental feature to distinguish quantum mechanics from classical theories. Estimations of coherence with perfectly characterised devices have been well‐studied. However, imperfections or malfunctions of realistic measurement devices might nullify the characterization. Device‐independent (DI) tests allow to witness and quantify the quantum feature of a system, such as entanglement, without trusting the implementation devices. Although DI test is a powerful tool in many quantum information tasks, it generally requires nonlocal settings. Little is known if single party coherence can be witnessed and estimated via untrusted devices. In this work, coherence witnesses and estimations with untrusted devices are systematically studied. First, a no‐go theorem for detecting existences of single party coherence via a DI or semi DI means is proven. A general prepare‐and‐measure semi DI scheme for witnessing and estimating the amount of coherence is then proposed. How to estimate the relative entropy and the l1 norm of single party coherence with analytical and numerical approaches is shown. As coherence is an essential resource for tasks such as quantum random number generation and quantum key distribution, it is expected that this result may shed light on designing new quantum cryptographic schemes.

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Device-independent randomness expansion with entangled photons

Cited by 67 publications

References 24 publications

Quantum technologies in the telecommunications industry

Quantum technologies in the telecommunications industry

Predictably random

Estimating Coherence Measures with Untrusted Devices

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