On-demand maximally entangled states with a parity meter and continuous feedback

Rheda, Clemens Meyer zu and Haack, Géraldine and Romito, Alessandro (2014) On-demand maximally entangled states with a parity meter and continuous feedback. Physical review B, 90 (15). ISSN 2469-9950

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Generating on-demand maximally entangled states is one of the corner stones for quantum information processing. Parity measurements can serve to create Bell states and have been implemented via an electronic Mach-Zehnder interferometer among others. However, the entanglement generation is necessarily harmed by measurement induced dephasing processes in one of the two parity subspace. In this work, we propose two different schemes of continuous feedback for a parity measurement. They enable us to avoid both the measurement-induced dephasing process and the experimentally unavoidable dephasing, e.g. due to fluctuations of the gate voltages controlling the initialization of the qubits. We show that we can generate maximally entangled steady states in both parity subspaces. Importantly, the measurement scheme we propose is valid for implementation of parity measurements with feedback loops in various solid-state environments.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Additional Information:
8 pages, published version
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Deposited On:
07 Mar 2017 10:52
Last Modified:
15 Oct 2023 00:28