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

Abstract

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.

References in corpus (9)

• Quantum nature of a strongly-coupled single quantum dot-cavity system
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• Resonance fluorescence from a coherently driven semiconductor quantum dot in a cavity
• Ultrafast optical control of entanglement between two quantum dot spins
• Generation and transfer of single photons on a photonic crystal chip
• Quantum computing by optical control of electron spins
• Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states
• Enhanced spontaneous emission in a photonic crystal light-emitting diode
• Fast Two-Qubit Gates in Semiconductor Quantum Dots using a Photonic Microcavity

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• Minimal ancilla mediated quantum computation
• Routing single photons with quantum emitters coupled to nanostructures
• Spin-photon Qubits for Scalable Quantum Network
• Chiral modes near exceptional points in symmetry broken H1 photonic crystal cavities