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Experimental device-independent verification of quantum steering
Quantum Physics · Submitted 4 Aug 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We present device-independent steering protocols that remove this need for trust, even when Bell nonlocality is not present.
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The abstract, sentence by sentence
Bell nonlocality between distant quantum systems---i.e., joint correlations which violate a Bell inequality---can be verified without trusting the measurement devices used, nor those performing the measurements. This leads to unconditionally secure protocols for quantum information tasks such as cryptographic key distribution. However, complete verification of Bell nonlocality requires high detection efficiencies, and is not robust to the typical transmission losses that occur in long distance applications. In contrast, quantum steering, a weaker form of quantum correlation, can be verified for arbitrarily low detection efficiencies and high losses. The cost is that current steering-verification protocols require complete trust in one of the measurement devices and its operator, allowing only one-sided secure key distribution. We present device-independent steering protocols that remove this need for trust, even when Bell nonlocality is not present. We experimentally demonstrate this principle for singlet states and states that do not violate a Bell inequality.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Bell nonlocality between distant quantum systems---i.e., joint correlations which violate a Bell inequality---can be verified without trusting the measurement devices used, nor those performing the measurements. | background 1.00 | 0.07 | 0.05 | asserted 0.98 |
| s1 | This leads to unconditionally secure protocols for quantum information tasks such as cryptographic key distribution. | background 0.81 | 0.05 | 0.04 | asserted 0.99 |
| s2 | However, complete verification of Bell nonlocality requires high detection efficiencies, and is not robust to the typical transmission losses that occur in long distance applications. | background 0.81 | 0.09 | 0.03 | asserted 1.00 |
| s3 | In contrast, quantum steering, a weaker form of quantum correlation, can be verified for arbitrarily low detection efficiencies and high losses. | background 0.98 | 0.09 | 0.08 | asserted 0.98 |
| s4 | The cost is that current steering-verification protocols require complete trust in one of the measurement devices and its operator, allowing only one-sided secure key distribution. | gap 0.54 | 0.05 | 0.05 | asserted 1.00 |
| s5 | We present device-independent steering protocols that remove this need for trust, even when Bell nonlocality is not present. | contribution 1.00 | 0.90 | 0.81 | asserted 1.00 |
| s6 | We experimentally demonstrate this principle for singlet states and states that do not violate a Bell inequality. | contribution 0.74 | 0.96 | 0.27 | asserted 1.00 |
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The paper
Original abstract
Bell nonlocality between distant quantum systems---i.e., joint correlations which violate a Bell inequality---can be verified without trusting the measurement devices used, nor those performing the measurements. This leads to unconditionally secure protocols for quantum information tasks such as cryptographic key distribution. However, complete verification of Bell nonlocality requires high detection efficiencies, and is not robust to the typical transmission losses that occur in long distance applications. In contrast, quantum steering, a weaker form of quantum correlation, can be verified for arbitrarily low detection efficiencies and high losses. The cost is that current steering-verification protocols require complete trust in one of the measurement devices and its operator, allowing only one-sided secure key distribution. We present device-independent steering protocols that remove this need for trust, even when Bell nonlocality is not present. We experimentally demonstrate this principle for singlet states and states that do not violate a Bell inequality.
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How the literature uses it
1 arXiv paper cite this in 2 sentences
Papers citing it
Cites it as support 1 paper
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Experimentally, at variance with the case of Bell tests, a demonstration of steering free of detection and locality loopholes is in reach [ref] , which makes one-sided device-independent QKD appealing for current technology and quantum steering a practically useful concept.
Quantification of Gaussian quantum steering · Introduction · 0.96
Cites it as background 1 paper
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Several experiments have been already performed, demonstrating steering and its asymmetry [ref] , and a number of recent studies have been devoted to improve our understanding of quantum steerability, ranging from the development of better criteria to detect steerable states [ref] , to the analysis of the distribution of steering among multiple parties [ref] .
Quantification of Gaussian quantum steering · Introduction · 0.93
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