Ultrafast optical spin echo in a single quantum dot

Press, David; Greve, Kristiaan De; McMahon, Peter L.; Ladd, Thaddeus D.; Frieß, Benedikt; Schneider, Christian; Kamp, M.; Höfling, Sven; Forchel, A.; Yamamoto, Yoshihisa

doi:10.1038/nphoton.2010.83

Cited by 330 publications

(375 citation statements)

References 27 publications

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“…The relatively short timescale in which teleportation can be observed for QD2 limits possible applications of teleportation where longer memory times are needed. We note that at higher magnetic fields spin T 2 coherence times exceeding 1 ms have been reported for single InAs QDs 40 : future work is needed to understand and extend the timescale that currently limits the memory time we observe.…”

Section: Indistinguishable Photonic Frequency Qubitsmentioning

confidence: 71%

“…We emphasize that, unlike measurements of entanglement fidelity [34][35][36] , the experimentally determined teleportation fidelity is independent of the detector jitter. Prolongation of the spin-echo time beyond 25 ns in our experiments is limited by dynamical nuclear spin polarization effects 40,41 that are omnipresent in self-assembled QDs (see Supplementary Note 3). The relatively short timescale in which teleportation can be observed for QD2 limits possible applications of teleportation where longer memory times are needed.…”

Section: Indistinguishable Photonic Frequency Qubitsmentioning

confidence: 97%

“…This timescale is commonly referred to as spin T Ã 2 dephasing time; for our QDs T Ã 2 $ 1 ns. To ensure that the electron spin coherence is intact for a longer time period, we introduce what is referred to as an optical spin-echo sequence 40 …”

Section: Indistinguishable Photonic Frequency Qubitsmentioning

confidence: 99%

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Quantum teleportation from a propagating photon to a solid-state spin qubit

et al. 2013

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A quantum interface between a propagating photon used to transmit quantum information and a long-lived qubit used for storage is of central interest in quantum information science. A method for implementing such an interface between dissimilar qubits is quantum teleportation. Here we experimentally demonstrate transfer of quantum information carried by a photon to a semiconductor spin using quantum teleportation. In our experiment, a single photon in a superposition state is generated using resonant excitation of a neutral dot. To teleport this photonic qubit, we generate an entangled spin-photon state in a second dot located 5 m away and interfere the photons from the two dots in a Hong-Ou-Mandel set-up. Thanks to an unprecedented degree of photon-indistinguishability, a coincidence detection at the output of the interferometer heralds successful teleportation, which we verify by measuring the resulting spin state after prolonging its coherence time by optical spin-echo.

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Section: Indistinguishable Photonic Frequency Qubitsmentioning

confidence: 71%

Section: Indistinguishable Photonic Frequency Qubitsmentioning

confidence: 97%

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Quantum teleportation from a propagating photon to a solid-state spin qubit

et al. 2013

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“…In an experiment with a large number of identical measurements, electron spins initialized in the same state will exhibit different dynamics as they will evolve in a slightly different effective magnetic field. When averaging over many measurements, this will effectively result in spin dephasing on the scale of a typical precession period of the electron in the field of the order of σ Bnuc : the dephasing time T * 2 is of the order of 15 ns for σ Bnuc ≈6 mT 1, 5,10,11,26,27 . Much of this dephasing due to the random nuclear field can be unwound using spin-echo techniques, since the nuclear field evolves slowly on the timescale of the electron spin dynamics.…”

Section: Hyperfine Interactionmentioning

confidence: 99%

Nuclear spin effects in semiconductor quantum dots

et al. 2013

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“…S ignificant progress has been reported within quantum information science for quantum-dot (QD) spins as stationary qubits 1,2 , including state preparation 3,4 , long spin-coherence times 5,6 , ultrafast optical manipulation capabilities 7,8 and single-shot read-out 9 . A successful realization of a solid-state quantum network relies on scalable entangling gates between individual spins.…”

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confidence: 99%

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

et al. 2013

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Resonance fluorescence in the Heitler regime provides access to single photons with coherence well beyond the Fourier transform limit of the transition, and holds the promise to circumvent environment-induced dephasing common to all solid-state systems. Here we demonstrate that the coherently generated single photons from a single self-assembled InAs quantum dot display mutual coherence with the excitation laser on a timescale exceeding 3 s. Exploiting this degree of mutual coherence, we synthesize near-arbitrary coherent photon waveforms by shaping the excitation laser field. In contrast to post-emission filtering, our technique avoids both photon loss and degradation of the single-photon nature for all synthesized waveforms. By engineering pulsed waveforms of single photons, we further demonstrate that separate photons generated coherently by the same laser field are fundamentally indistinguishable, lending themselves to the creation of distant entanglement through quantum interference.

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Ultrafast optical spin echo in a single quantum dot

Cited by 330 publications

References 27 publications

Quantum teleportation from a propagating photon to a solid-state spin qubit

Quantum teleportation from a propagating photon to a solid-state spin qubit

Nuclear spin effects in semiconductor quantum dots

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

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