Quantum control of a spin qubit coupled to a photonic crystal cavity

By S. Carter, T. Sweeney, Mijin Kim, C. Kim, D. Solenov, Sophia E. Economou, T. Reinecke, Lily Yang, A. Bracker, D. Gammon. Nature Photonics, 2012

135 citations recorded by the source corpus.

A key ingredient for a quantum network is an interface between stationary quantum bits and photons, which act as flying qubits for interactions and communication. Photonic crystal architectures are promising platforms for enhancing the coupling of light to solid-state qubits. Quantum dots can be integrated into a photonic crystal, with optical transitions coupling to photons and spin states forming a long-lived quantum memory. Many researchers have now succeeded in coupling these emitters to photonic crystal cavities, but there have been no demonstrations of a functional spin qubit and quantum gates in this environment. Here, we have developed a coupled cavity–quantum dot system in which the dot is controllably charged with a single electron. We perform the initialization, rotation and measurement of a single electron spin qubit using laser pulses, and find that the cavity can significantly improve these processes. Using a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic crystal cavity, researchers demonstrate complete quantum control of an electron spin qubit. By cleverly controlling the charge state of the InAs quantum dot using laser pulses, optical initialization, control and readout of an electron spin are achieved.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/c42043fad732d1b45a223b6d35409d590d47af6b

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Citations in the corpus

Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, unknown): “An important recent highlight is the experimental demonstration of memory-enhanced quantum communication surpassing repeterless-less bound in proof-of-concept laboratory setting, using a solid-state spin memory associated with Silicon Vacancy (SiV) color center integrated in a diamond nanophotonic r”
Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “, 2011) or photonic crystal cavities (Hennessy et al., 2007; Faraon et al., 2008; Nomura et al., 2010; Yoshie et al., 2011; Carter et al., 2012), and strong coupling with the photon field in the cavity can be achieved.”
Colloquium: Strongly interacting photons in one-dimensional continuum (2016, background): “…experiments have also been conducted on a variety of solid-state systems, including quantum dots (QDs) in photonic crystals (Badolato et al., 2005; Carter et al., 2013; Englund et al., 2007; Fushman et al., 2008; Hennessy et al., 2007; Yoshie et al., 2004) and superconducting microwave circuits.”