• Photonics Research
  • Vol. 10, Issue 9, 2047 (2022)
Gaoyan Zhu1, Chengjie Zhang2、3, Kunkun Wang1, Lei Xiao1, and Peng Xue1、*
Author Affiliations
  • 1Beijing Computational Science Research Center, Beijing 100084, China
  • 2School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
  • 3State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
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    DOI: 10.1364/PRJ.462212 Cite this Article Set citation alerts
    Gaoyan Zhu, Chengjie Zhang, Kunkun Wang, Lei Xiao, Peng Xue. Experimental witnessing for entangled states with limited local measurements[J]. Photonics Research, 2022, 10(9): 2047 Copy Citation Text show less

    Abstract

    We experimentally demonstrate a method for detection of entanglement via construction of entanglement witnesses from a limited fixed set of local measurements (M). Such a method does not require a priori knowledge about the form of the entanglement witnesses. It is suitable for a scenario where a full state tomography is not available, but the only resource is a limited set of M. We demonstrate the method on pure two-qubit entangled states and mixed two-qubit entangled states, which emerge from photonic implementation of controllable quantum noisy channels. The states we select are motivated by realistic experimental conditions, and we confirm it works well for both cases. Furthermore, possible generalizations to higher-dimensional bipartite systems have been considered, which can potentially detect both decomposable and indecomposable entanglement witnesses. Our experimental results show perfect validity of the method, which indicates that even a limited set of local measurements can be used for quick entanglement detection and further provide a practical test bed for experiments with entanglement witnesses.
    W=i,jTijσiσj,

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    W=ασ0σ0+i=1,2,3(aiσ0σi+biσiσ0)+i=1,2,3ciσiσi,

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    W=PΓ.

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    |φ1=a|Φ++b|Φ;|φ2=a|Ψ++b|Ψ;|φ3=a|Φ++b|Ψ+;|φ4=a|Φ+b|Ψ;|φ5=a|Φ++ib|Ψ;|φ6=a|Φ+ib|Ψ+,

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    Wk=|ϕkϕk|Γ,

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    W1=14[σ0σ0+σ3σ3+(a2b2)σ1σ1+(a2b2)σ2σ2+2ab(σ3σ0+σ0σ3)],

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    |ϕ=α|HH+1α2|VV,

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    ρiMiρMi,

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    ρp0ρ+p1σ1ρσ1+p2σ2ρσ2+p3σ3ρσ3.

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    Wijk=|φijkφi|jkΓ,

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    W=DdPd+,

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    D[abc]=i=13|ii|[(a+1)|ii|+b|i+1i+1|+c|i+2i+2|],

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    |ϕ=c0|00+c1|11+c2|12+c3|21+c4|22,

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    ρ(1p)ρ+pσ3ρσ3.(A1)

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    ρ(1p)ρ+p3(σ1ρσ1+σ2ρσ2+σ3ρσ3).(A2)

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    |Φ+=12(|00+|11),(B1)

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    ρw=4F13|Φ+Φ+|+1F314,(B2)

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    A=j=0d21cjGj,(C1)

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    {GlD=1l(l+1)(j=1l|jj|l|l+1l+1|),1ld1;GjkS=(|jk|+|kj|)/2,1j<kd;GjkA=(|jk||kj|)/i2,1j<kd.(C2)

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    A=1d2[II+α,β=1d21(aαGαI+bαIGα)+α,β=1d21CαβGαGβ],(C3)

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    α,βCαβGαGβ=k,l=1d1DklGkDGlD+i<j(SijGijSGijS+AijGijAGijA).(C4)

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    M3={G1DG1D,G2DG2D,G1DG2D,G2DG1D;G1SG1S,G2SG2S,G3SG3S;G1AG1A,G2AG2A,G3AG3A}.(C5)

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    |φ1jk=a|Φ+jk+b|Φjk;|φ2jk=a|Ψ+jk+b|Ψjk;|φ3jk=a|Φ+jk+b|Ψ+jk;|φ4jk=a|Φjk+b|Ψjk;|φ5jk=a|Φ+jk+ib|Ψjk;|φ6jk=a|Φjk+ib|Ψ+jk,(C6)

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    Wijk=|φijkφi|jkΓ,(C7)

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    W=DdPd+,(C8)

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    D[abc]=i=13|ii|[(a+1)|ii|+b|i+1i+1|+c|i+2i+2|],(C9)

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    |ϕθ=c1|00+c2|11+c3|12+c4|21+c5|22,(C10)

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    Gaoyan Zhu, Chengjie Zhang, Kunkun Wang, Lei Xiao, Peng Xue. Experimental witnessing for entangled states with limited local measurements[J]. Photonics Research, 2022, 10(9): 2047
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