Measurement-induced entanglement of two transmon qubits by a single photon

Abstract

On-demand creation of entanglement between distant qubits is a necessary ingredient for distributed quantum computation. We propose an entanglement scheme that allows for single-shot deterministic entanglement creation by detecting a single photon passing through a Mach-Zehnder interferometer with one transmon qubit in each arm. The entanglement production essentially relies on the fact that superconducting microwave structures allow to achieve strong coupling between the qubit and the photon. By detecting the photon via a photon counter, a parity measurement is implemented and the wave function of the two qubits is projected onto a maximally entangled state. Most importantly, the entanglement generation is heralded such that our protocol is not susceptible to photon loss due to the indivisible nature of single photons.

18 pages, 2 figures; to be published in NJP

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Cited by in corpus (4)

• Chip-to-chip entanglement of transmon qubits using engineered measurement fields
• Entanglement-Preserving Limit Cycles from Sequential Quantum Measurements and Feedback
• Entanglement of a pair of quantum emitters via continuous fluorescence measurements: a tutorial
• Optimal quantum resource generation in coupled transmons immersed in Markovian baths