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<p>Orbital angular momentum (OAM) of light has acquired the interest of scientists due to its novel properties. The high-dimensional Hilbert space and entanglement that OAM offers make it a valuable DOF for many quantum optical protocols. However, conventional measurement of OAM state, which exploits coincidence count-based quantum state tomography (QST), suffers from low-brightness and subsequent need for data accumulation times. Such problems are a serious obstacle, especially for high-dimensional OAM qudits. In this work, we suggest stimulated emission tomography (SET) as a solution for bright and efficient measurement of OAM entangled photons. We show that SET can successfully extract information of SPDC photons by measuring the spiral bandwidth and reconstructing the density matrix of SPDC photons. The fidelity and linear entropy of the reconstructed density matrix are <InlineEquation ID="IEq1"><EquationSource Format="TEX">\(0.91\pm 0.01\)</EquationSource></InlineEquation> and <InlineEquation ID="IEq2"><EquationSource Format="TEX">\(0.12\pm 0.01\)</EquationSource></InlineEquation>, respectively, while the time required for each projective measurement is 1&#xa0;s. Our results show the potential of SET as an efficient alternative to conventional QST.</p>

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Measurement of degenerate orbital angular momentum qubits by stimulated emission tomography

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月18日

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  • Seonghu Jung,
  • Do-Kyeong Ko

摘要

Orbital angular momentum (OAM) of light has acquired the interest of scientists due to its novel properties. The high-dimensional Hilbert space and entanglement that OAM offers make it a valuable DOF for many quantum optical protocols. However, conventional measurement of OAM state, which exploits coincidence count-based quantum state tomography (QST), suffers from low-brightness and subsequent need for data accumulation times. Such problems are a serious obstacle, especially for high-dimensional OAM qudits. In this work, we suggest stimulated emission tomography (SET) as a solution for bright and efficient measurement of OAM entangled photons. We show that SET can successfully extract information of SPDC photons by measuring the spiral bandwidth and reconstructing the density matrix of SPDC photons. The fidelity and linear entropy of the reconstructed density matrix are \(0.91\pm 0.01\) and \(0.12\pm 0.01\), respectively, while the time required for each projective measurement is 1 s. Our results show the potential of SET as an efficient alternative to conventional QST.