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Conference on Lasers and Electro-Optics

Quantum photonics and quantum transport approach for realizing photon-spin quantum state transfer device

Hideo Kosaka, Takeshi Kutsuwa, K. Arai, Yoshiaki Rikitake, Keiji Ono, Hiroshi Imamura, T. Takagahara, Yasuyoshi Mitsumori, Keiichi Edamatsu

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We present photon-spin quantum-state-transfer (QST) approach. GaAs/AlGaAs-QW with g~0 showed nonlinear B-field dependence of spin precession, suggesting photon-to-nuclei polarization transfer. 2DEG with quantum-point-contact on InGaAs/InP showed telecomwavelength-sensitive quantum transport. Efficient/high-fidelity QST conditions were also found.

DOI
10.1109/cleo.2006.4629030

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AIP conference proceedings•Jan 1, 2007•0 citations
We present photon-spin quantum-state-transfer (QST) approach. GaAs/AlGaAs-QW with g~0 showed nonlinear B-field dependence of spin precession, suggesting photon-to-nuclei polarization transfer. 2DEG with quantum-point-contact on InGaAs/InP showed telecomwavelength-sensitive quantum transport. Efficient/high-fidelity QST conditions were also found.
Quantum information can be stored and manipulated by an electron spin if its state was faithfully transferred from messenger photon qubit. Such a quantum state transfer needs to have a function of conversion from photon polarization to electron spin state and flagging the safe conversion without destroying the spin state. We have achieved single photon response by using a quantum dot as an electron trap and a quantum point contact as a charge sensor on GaAs/AlGaAs-based modulation doped structure. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Connecting quantum processors over long distances using photon qubits would enable more complex quantum computing architectures and quantum networks. Recently a protocol to transfer a quantum state from a photonic qubit to a singlet-triplet spin qubit in GaAs/AlGaAs heterostructure has been theoretically demonstrated. In practice, the coherent transfer is facilitated by a hybrid device where a GaAs/AlGaAs gate-defined quantum dot (GDQD) is tunnel coupled to a self-assembled quantum dot (SAQD), in which a conversion between a photon state and a spin state takes place. This work addressed the three requirements of the optical-interface devices based on tunnel coupling between the GDQD and the SAQD: (i) a properly designed GaAs/AlGaAs heterostructure where the two-dimensional electron gas (2DEG) can be electrically tuned into resonance with the InAs SAQD; (ii) high-mobility 2DEG to form and operate a GDQD; (iii) precise alignment between the SAQD and the GDQD. It is proven that the InAs SAQD can be tuned to be charged, discharged, and resonant with the 2DEG by applying a local electric field.
We present experimental and theoretical approach for building a quantum repeater. Device structure for quantum state transfer from a photon to an electron spin was designed, fabricated and evaluated. Light‐hole exciton excitation in GaAs/AlGaAs‐quantum well with near‐zero electron g‐factor showed “negative polarization”, which indicates polarization transfer from a photon to an electron spin. We have also observed dynamic nuclear polarization implying polarization transfer from a photon to a nuclear spin intermediated by an electron spin.