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Experimental demonstration of a programmable quantum computer by NMR

Jae‐Hyun Kim, Jae‐Seung Lee, Taesoon Hwang +1 more

Journal of Magnetic ResonanceNov 7, 20032 citations

Experimental demonstration of fully contextual quantum correlations on an NMR quantum information processor

Dileep Singh, Jaskaran Singh, Kavita Dorai +1 more

The existence of contextuality in quantum mechanics is a fundamental departure from the classical description of the world. Currently, the quest to identify scenarios which cannot be more contextual than quantum theory is at the forefront of research in quantum contextuality. In this work we experimentally test two inequalities, which are capable of revealing fully contextual quantum correlations, on a Hilbert space of dimension 8 and 4, respectively, on an NMR quantum information processor. The projectors associated with the contextuality inequalities are reformulated in terms of Pauli operators, which can be determined in an NMR experiment. We analyze the behavior of each inequality under rotation of the underlying quantum state, which unitarily transforms it to another pure state.The existence of contextuality in quantum mechanics is a fundamental departure from the classical description of the world. Currently, the quest to identify scenarios which cannot be more contextual than quantum theory is at the forefront of research in quantum contextuality. In this work we experimentally test two inequalities, which are capable of revealing fully contextual quantum correlations, on a Hilbert space of dimension 8 and 4, respectively, on an NMR quantum information processor. The projectors associated with the contextuality inequalities are reformulated in terms of Pauli operators, which can be determined in an NMR experiment. We analyze the behavior of each inequality under rotation of the underlying quantum state, which unitarily transforms it to another pure state.

arXiv:1903.09912Physical Review AAug 8, 20198 citations

State-independent experimental test of quantum contextuality

Gerhard Kirchmair, F. Zähringer, R. Gerritsma +5 more

arXiv:0904.1655NatureJul 1, 2009387 citations

Simultaneous observation of quantum contextuality and quantum nonlocality

Xiao‐Min Hu, Bi‐Heng Liu, Jiangshan Chen +5 more

中国科学通报：英文版Jul 6, 20189 citations

Experimental demonstration of quantum contextuality with nine observables on a single photonic qutrit

Xiao-Xiao Chen, Jian Li, Mairikena Aili +3 more

The violation of contextuality inequalities shows a strong conflict between the noncontextual hidden variable theory and quantum mechanics. A single qutrit is the simplest indivisible quantum system that can allow a state-dependent contextuality test with five observables and a state-independent contextuality test with 13 observables. For any qutrit states, except for the maximally mixed state, one can always find a set of nine observables for which the corresponding inequality is violated [P. Kurzynski and D. Kaszlikowski, Phys. Rev. A 86, 042125 (2012)]. In this paper, we demonstrate the violation of this inequality using single-photon experiments. Our experiments not only enrich the tests of quantum contextuality, but also deepen the understanding of the physical nature of quantum mechanics.The violation of contextuality inequalities shows a strong conflict between the noncontextual hidden variable theory and quantum mechanics. A single qutrit is the simplest indivisible quantum system that can allow a state-dependent contextuality test with five observables and a state-independent contextuality test with 13 observables. For any qutrit states, except for the maximally mixed state, one can always find a set of nine observables for which the corresponding inequality is violated [P. Kurzynski and D. Kaszlikowski, Phys. Rev. A 86, 042125 (2012)]. In this paper, we demonstrate the violation of this inequality using single-photon experiments. Our experiments not only enrich the tests of quantum contextuality, but also deepen the understanding of the physical nature of quantum mechanics.

Physical Review AApr 25, 20232 citations

Proposed experiments of qutrit state-independent contextuality and two-qutrit contextuality-based nonlocality

Adán Cabello, Elias Amselem, Kate Blanchfield +2 more

Recent experiments have demonstrated ququart state-independent quantum contextuality and qutrit state-dependent quantum contextuality. So far, the most basic form of quantum contextuality pointed out by Kochen and Specker, and Bell, has eluded experimental confirmation. Here we present an experimentally feasible test to observe qutrit state-independent quantum contextuality using single photons in a three-path setup. In addition, we show that if the same measurements are performed on two entangled qutrits, rather than sequentially on the same qutrit, then the noncontextual inequality becomes a Bell inequality. We show that this connection also applies to other recently introduced noncontextual inequalities.Recent experiments have demonstrated ququart state-independent quantum contextuality and qutrit state-dependent quantum contextuality. So far, the most basic form of quantum contextuality pointed out by Kochen and Specker, and Bell, has eluded experimental confirmation. Here we present an experimentally feasible test to observe qutrit state-independent quantum contextuality using single photons in a three-path setup. In addition, we show that if the same measurements are performed on two entangled qutrits, rather than sequentially on the same qutrit, then the noncontextual inequality becomes a Bell inequality. We show that this connection also applies to other recently introduced noncontextual inequalities.

arXiv:1203.0981Physical Review AMar 5, 201237 citations

Experimental demonstration of quantum contextuality on an NMR qutrit

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