Quantum phase measurement for two-qubit states in an open waveguide

We present a new method for quantum state tomography within a single-excitation subspace of two-qubit states in an open waveguide. The system under investigation consists of three qubits in an open waveguide, separated by a distance comparable to the wavelength of the electromagnetic field. We show...

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Veröffentlicht in:	arXiv.org 2022-07
Hauptverfasser:	Greenberg, Ya S, Shtygashev, A A
Format:	Artikel
Sprache:	eng
Schlagworte:	Electromagnetic fields Entangled states Phase measurement Physics - Quantum Physics Qubits (quantum computing) Waveguides
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creator	Greenberg, Ya S Shtygashev, A A
description	We present a new method for quantum state tomography within a single-excitation subspace of two-qubit states in an open waveguide. The system under investigation consists of three qubits in an open waveguide, separated by a distance comparable to the wavelength of the electromagnetic field. We show that the modulation of the frequency of the central ancillary qubit allows us to obtain unambiguous information about the initial phase difference $\varphi_1-\varphi_3$ of the edge qubits via the measurement of the evolution of their probability amplitudes.
doi_str_mv	10.48550/arxiv.2206.00864
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subjects	Electromagnetic fields Entangled states Phase measurement Physics - Quantum Physics Qubits (quantum computing) Waveguides
title	Quantum phase measurement for two-qubit states in an open waveguide
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