Detecting Entanglement by State Preparation and a Fixed Measurement

• URL: http://arxiv.org/abs/2303.16368v1
• Date: Wed, 29 Mar 2023 00:30:27 GMT
• Title: Detecting Entanglement by State Preparation and a Fixed Measurement
• Authors: Jaemin Kim, Anindita Bera, Joonwoo Bae, Dariusz Chruscinski
• Abstract summary: Entanglement detection by state preparation can be extended to multipartite states such as graph states. We present network states for both cases to construct decomposable entanglement witnesses. Results readily apply to a realistic scenario, for instance, an array of superconducting qubits.
• Score: 7.818765015637801
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: It is shown that a fixed measurement setting, e.g., a measurement in the computational basis, can detect all entangled states by preparing multipartite quantum states, called network states. We present network states for both cases to construct decomposable entanglement witnesses (EWs) equivalent to the partial transpose criteria and also non-decomposable EWs that detect undistillable entangled states beyond the partial transpose criteria. Entanglement detection by state preparation can be extended to multipartite states such as graph states, a resource for measurement-based quantum computing. Our results readily apply to a realistic scenario, for instance, an array of superconducting qubits. neutral atoms, or photons, in which the preparation of a multipartite state and a fixed measurement are experimentally feasible.

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