Deterministic Teleportation and Universal Computation Without Particle Exchange

Abstract

Teleportation is a cornerstone of quantum technologies, and has played a key role in the development of quantum information theory. Pushing the limits of teleportation is therefore of particular importance. Here, we apply a different aspect of quantumness to teleportation -- namely exchange-free, or counterfactual, computation at a distance. We propose a universal controlled-phase gate, where no particles are exchanged between control and target. This allows the full repertoire of quantum computation to me made exchange-free, including both complete Bell detection among two remote parties and so teleportation and telecloning. Further, we show that this gate, and the protocols based on it, is experimentally feasible, simulating the fidelity of our exchange-free teleportation and telecloning protocols for realistic bit-errors.

9 pages, 5 figures. Accepted for publication in Journal of Physics Communications, matches accepted version

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Cited by in corpus (10)

• Counterfactual Ghost Imaging
• Quantum information
• The wavefunction as a true ensemble
• The laws of physics do not prohibit counterfactual communication
• From Counterportation to Local Wormholes
• Three approaches for analyzing the counterfactuality of counterfactual protocols
• Stochastic quantum trajectories demonstrate the Quantum Zeno Effect in open spin 1/2, spin 1 and spin 3/2 systems
• Is the dynamical quantum Cheshire cat detectable?
• The Quantum Eraser Paradox
• Interaction-free measurement of multiple objects using a universal integrated photonic processor