Optimal qubit circuits for quantum-enhanced telescopes

Abstract

We propose two optimal phase-estimation schemes that can be used for quantum-enhanced long-baseline interferometry. By using distributed entanglement, it is possible to eliminate the loss of stellar photons during transmission over the baselines. The first protocol is a sequence of gates using nonlinear optical elements, optimized over all possible measurement schemes to saturate the Cramér-Rao bound. The second approach builds on an existing protocol, which encodes the time of arrival of the stellar photon into a quantum memory. Our modified version reduces both the number of ancilla qubits and the number of gate operations by a factor of two.

arXiv comment14 pages, 9 figures

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Cited by in corpus (5)

• Quantum Internet: Technologies, Protocols, and Research Challenges
• Superresolution imaging with entanglement-enhanced telescopy
• Quantum-enabled optical large-baseline interferometry: applications, protocols and feasibility
• Random Distillation Protocols in Long Baseline Telescopy
• Quantum resolution limit of long-baseline imaging using distributed entanglement