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001038100 1001_ $$0P:(DE-HGF)0$$aWu, Kui$$b0$$eCorresponding author
001038100 245__ $$aModeling an efficient singlet-triplet-spin-qubit-to-photon interface assisted by a photonic crystal cavity
001038100 260__ $$aCollege Park, Md. [u.a.]$$bAmerican Physical Society$$c2024
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001038100 520__ $$aEfficient interconnection between distant semiconductor spin qubits with the help of photonic qubits offers exciting new prospects for future quantum communication applications. In this paper, we optimize the extraction efficiency of a novel interface between a singlet-triplet-spin-qubit and a photonic-qubit. The interface is based on a 220-nm-thick Ga⁢As/(Al,Ga)⁢As heterostructure membrane and consists of a gate-defined double quantum dot (GDQD) supporting a singlet-triplet qubit, an optically active quantum dot (OAQD) consisting of a gate-defined exciton trap, a photonic crystal cavity providing in-plane optical confinement, efficient outcoupling to an ideal free-space Gaussian beam while accommodating the gate wiring of the GDQD and OAQD, and a bottom gold reflector to recycle photons and increase the optical extraction efficiency. All the essential components can be lithographically defined and deterministically fabricated on the Ga⁢As/(Al,Ga)⁢As heterostructure membrane, which greatly increases the scalability of on-chip integration. According to our simulations, the interface provides an overall coupling efficiency of 28.7% into a free-space Gaussian beam, assuming a Si⁢O2 interlayer fills the space between the reflector and the membrane. The performance can be further increased by undercutting this Si⁢O2 interlayer below the photonic crystal. In this case, the overall efficiency is calculated to be 48.5%.
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001038100 7001_ $$0P:(DE-Juel1)200353$$aKindel, Sebastian$$b1$$ufzj
001038100 7001_ $$0P:(DE-HGF)0$$aDescamps, Thomas$$b2
001038100 7001_ $$0P:(DE-HGF)0$$aHangleiter, Tobias$$b3
001038100 7001_ $$0P:(DE-HGF)0$$aMüller, Jan Christoph$$b4
001038100 7001_ $$0P:(DE-HGF)0$$aRodrigo, Rebecca$$b5
001038100 7001_ $$0P:(DE-HGF)0$$aMerget, Florian$$b6
001038100 7001_ $$0P:(DE-Juel1)145316$$aKardynal, Beata E.$$b7
001038100 7001_ $$0P:(DE-Juel1)172019$$aBluhm, Hendrik$$b8$$ufzj
001038100 7001_ $$0P:(DE-HGF)0$$aWitzens, Jeremy$$b9
001038100 773__ $$0PERI:(DE-600)2760310-6$$a10.1103/PhysRevApplied.21.054052$$gVol. 21, no. 5, p. 054052$$n5$$p054052$$tPhysical review applied$$v21$$x2331-7019$$y2024
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