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Counterfactual universal quantum computation
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Counterfactual universal quantum computation
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Universal quantum computation is usually associated with interaction among two-level quantum subsystems, as this interaction is commonly viewed as a necessity to achieve universal quantum computation. In this work, we show that, contrary to this intuition, universal quantum computation can be achieved without interaction among initially independent two-level quantum subsystems. We call it counterfactual universal quantum computation. As special cases, we show how to achieve counterfactual communication of quantum states, counterfactual quantum swapping, and counterfactual quantum erasure codes. To ease practical implementation, we analyze counterfactual universal quantum computation with realistic devices, including the effects of finite execution time, photon loss, and atom missing. Besides the theoretical interest of illustrating the mysterious and counterintuitive nature of quantum physics, our work has practical applications to color imaging of ancient arts, upon which light is forbidden to shine.
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Cited by 1 Pith paper
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Interaction-free measurement of multiple objects using a universal integrated photonic processor
Experimental sequential interaction-free measurements of up to five objects with one photon on an integrated photonic processor confirm theoretical predictions after error mitigation.
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