Single-qubit measurement of two-qubit entanglement in generalized Werner states

• URL: http://arxiv.org/abs/2306.04103v2
• Date: Tue, 28 Nov 2023 22:12:47 GMT
• Title: Single-qubit measurement of two-qubit entanglement in generalized Werner states
• Authors: Salini Rajeev and Mayukh Lahiri
• Abstract summary: We present a theory that shows how to measure entanglement in a family of two-qubit mixed states without detecting one of the qubits. Our method is interferometric and does not require any coincidence measurement or postselection.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Conventional methods of measuring entanglement in a two-qubit photonic mixed state require the detection of both qubits. We generalize a recently introduced method which does not require the detection of both qubits, by extending it to cover a wider class of entangled states. Specifically, we present a detailed theory that shows how to measure entanglement in a family of two-qubit mixed states - obtained by generalizing Werner states - without detecting one of the qubits. Our method is interferometric and does not require any coincidence measurement or postselection. We also perform a quantitative analysis of anticipated experimental imperfections to show that the method is experimentally implementable and resistant to experimental losses.

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