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Cooper-pair-based photon entanglement without isolated emitters

机译:无隔离发射器的基于库珀对的光子纠缠

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摘要

We show that the recombination of Cooper pairs in semiconductors can be used as a natural source of polarization-entangled photons, making use of the inherent angular momentum entanglement in the superconducting state. Our proposal is not based on opposite spin population of discrete energy levels and thus does not require isolated emitters such as single atoms or quantum dots. We observe that in bulk materials, the photon entanglement would be degraded due to the variety of decay channels available in the presence of light-hole (LH)-heavy-hole (HH) degeneracy. However, we show that the lifting of this degeneracy by use of a semiconductor quantum well should lead to faithful conversion of the Cooper-pair entanglement into photon entanglement. The second-order decay of two-electron states in Cooper-pair luminescence leaves no which-path information, resulting in perfect coherence between two pathways and hence, in principle, perfect entanglement. We calculate the purity of the entangled-photon state and find that it increases for larger LH-HH energy splitting and for lower temperatures. Moreover, the superconducting macroscopic coherence offers an enhancement to the emission rate, making this a promising scheme for efficient generation of entangled photons in simple electrically driven structures.
机译:我们证明了半导体中库珀对的重组可以用作偏振纠缠光子的自然来源,它利用了超导状态下固有的角动量纠缠。我们的建议不是基于离散的能级的相反自旋种群,因此不需要隔离的发射器,例如单个原子或量子点。我们观察到,在散装材料中,光子纠缠将由于存在轻孔(LH)-重孔(HH)简并性时可用的各种衰减通道而降低。但是,我们表明,通过使用半导体量子阱来消除这种简并性应该导致从库珀对纠缠到光子纠缠的忠实转换。库珀对发光中双电子态的二阶衰减不留下任何路径信息,从而导致两条路径之间具有完美的相干性,因此从原理上讲也具有完美的纠缠。我们计算了纠缠光子状态的纯度,发现随着较大的LH-HH能量分裂和较低的温度,其纯度增加。而且,超导宏观相干性提高了发射速率,这使其成为在简单的电驱动结构中有效产生纠缠光子的有前途的方案。

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  • 来源
    《Physical review》 |2014年第9期|094508.1-094508.7|共7页
  • 作者单位

    Department of Electrical Engineering, Technion, Haifa 32000, Israel;

    Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7,Centre for Quantum Materials, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7;

    Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7,Centre for Quantum Materials, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7,Centre for Quantum Information and Quantum Control and the Institute for Optical Sciences, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7,Department of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, USA;

    Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7,Centre for Quantum Information and Quantum Control and the Institute for Optical Sciences, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical properties; nonclassical states of the electromagnetic field, includingrnentangled photon states; quantum state engineering and measurements;

    机译:光学性质电磁场的非经典状态;包括纠缠的光子状态;量子态工程与测量;

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