Strain tuning of quantum dot optical transitions via laser-induced surface defects

Bonato, Cristian; Nieuwenburg, Evert van; Gudat, Jan; Thon, Susanna M.; Kim, Hyochul; Exter, M. P. van; Bouwmeester, Dirk

doi:10.1103/physrevb.84.075306

Cited by 25 publications

(18 citation statements)

References 55 publications

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“…The phase shift π in our schemes can be achieved by a single photon which interacts with the QD twice. The above model works for a general polarization-degenerate cavity mode, including the micropillar [35][36][37], H1 photonic crystal [38,39], and fiber-based [40] cavities. Utilizing the optical circular birefringence induced by cavity quantum electrodynamics, the QD-cavity platform has been used to generate the maximally entangled states [12,13,31,[41][42][43], construct the conditional phase gate on hybrid photon-QD systems [12,13], and design the hyper-CNOT gate on photonic qubits [19].…”

Section: Compact Quantum Circuit For a Cnot Gate On A Stationary mentioning

confidence: 99%

Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities

2014

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We present some compact quantum circuits for a deterministic quantum computing on electronspin qubits assisted by quantum dots inside single-side optical microcavities, including the CNOT, Toffoli, and Fredkin gates. They are constructed by exploiting the giant optical Faraday rotation induced by a single-electron spin in a quantum dot inside a single-side optical microcavity as a result of cavity quantum electrodynamics. Our universal quantum gates have some advantages. First, all the gates are accomplished with a success probability of 100% in principle. Second, our schemes require no additional electron-spin qubits and they are achieved by some input-output processes of a single photon. Third, our circuits for these gates are simple and economic. Moreover, our devices for these gates work in both the weak coupling and the strong coupling regimes, and they are feasible in experiment.

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Section: Compact Quantum Circuit For a Cnot Gate On A Stationary mentioning

confidence: 99%

Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities

2014

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“…In our proposal, the two cavity modes with right-and left-circular polarizations, which couple to the two transitions |+ ↔ |A 2 and |− ↔ |A 2 respectively, are required. Many good experiments that provide a cavity supporting both of two circularly-polarized modes with the same frequency have been realized [57][58][59][60][61][62][63]. For example, Luxmoore et al [57] presented a technique for fine tuning of the energy split between the two circularlypolarized modes to just 0.15nm in 2012.…”

Section: Discussion and Summarymentioning

confidence: 99%

Hyperentanglement purification for two-photon six-qubit quantum systems

2016

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Recently, two-photon six-qubit hyperentangled states were produced in experiment and they can improve the channel capacity of quantum communication largely. Here we present a scheme for the hyperentanglement purification of nonlocal two-photon systems in three degrees of freedom (DOFs), including the polarization, the first-longitudinal-momentum, and the second longitudinal momentum DOFs. Our hyperentanglement purification protocol (hyper-EPP) is constructed with two steps resorting to parity-check quantum nondemolition measurement on the three DOFs and SWAP gates, respectively. With these two steps, the bit-flip errors in the three DOFs can be corrected efficiently. Also, we show that using SWAP gates is a universal method for hyper-EPP in the polarization DOF and multiple longitudinal momentum DOFs. The implementation of our hyper-EPP is assisted by nitrogen-vacancy centers in optical microcavities, which could be achieved with current techniques. It is useful for long-distance high-capacity quantum communication with two-photon six-qubit hyperentanglement.

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“…The general resonators employed in our proposals should be polarization-degenerate ones, and they can be achieved by employing silica microtoroid resonators [64,71,76,77] fabricated on silicon wafers, H1 planar photonic crystal cavities [78][79][80][81] formed in thin semiconductor slab waveguides, micropillar cavities [82][83][84] grown by molecular-beam epitaxy on GaAs [100] substrates, or fiber-based Fabry-Perot cavities [72][73][74]. The degeneracy of the two orthogonal polarization modes of the H1 cavity is broken by systematic errors, such as hole shape and period, in the imperfect fabrication process.…”

Section: Fidelities and Efficiencies Of Our Universal Optical Quamentioning

confidence: 99%

“…This mode splitting can be restored by using the postfabrication tuning technique [78], by using the uniaxial strain technique [79], or by compensating for the fabrication error technique [80]. The energy of a micropillar cavity is split by residual strain in the structure or small shape asymmetries, and it can be tuned into polarization-degeneracy by laser-induced surface defects [82][83][84].…”

Section: Fidelities and Efficiencies Of Our Universal Optical Quamentioning

confidence: 99%

Universal photonic quantum gates assisted by ancilla diamond nitrogen-vacancy centers coupled to resonators

Wei

Long

2015

Phys. Rev. A

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We propose two compact, economic, and scalable schemes for implementing optical controlled-phase-flip and controlled-controlled-phase-flip gates by using the input-output process of a single-sided cavity strongly coupled to a single nitrogen-vacancy-center defect in diamond. Additional photonic qubits, necessary for procedures based on the parity-check measurement or controlled-path and merging gates, are not employed in our schemes. In the controlled-path gate, the paths of the target photon are conditionally controlled by the control photon, and these two paths can be merged back into one by using a merging gate. Only one half-wave plate is employed in our scheme for the controlled-phase-flip gate. Compared with the conventional synthesis procedures for constructing a controlled-controlled-phase-flip gate, the cost of which is two controlled-path gates and two merging gates, or six controlled-NOT gates, our scheme is more compact and simpler. Our schemes could be performed with a high fidelity and high efficiency with current achievable experimental techniques.

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Strain tuning of quantum dot optical transitions via laser-induced surface defects

Cited by 25 publications

References 55 publications

Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities

Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities

Hyperentanglement purification for two-photon six-qubit quantum systems

Universal photonic quantum gates assisted by ancilla diamond nitrogen-vacancy centers coupled to resonators

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