Generating entanglement with low Q-factor microcavities

Abstract

We propose a method of generating entanglement using single photons and electron spins in the regime of resonance scattering. The technique involves matching the spontaneous emission rate of the spin dipole transition in bulk dielectric to the modified rate of spontaneous emission of the dipole coupled to the fundamental mode of an optical microcavity. We call this regime resonance scattering where interference between the input photons and those scattered by the resonantly coupled dipole transition result in a reflectivity of zero. The contrast between this and the unit reflectivity when the cavity is empty allow us to perform a non demolition measurement of the spin and to non deterministically generate entanglement between photons and spins. The chief advantage of working in the regime of resonance scattering is that the required cavity quality factors are orders of magnitude lower than is required for strong coupling, or Purcell enhancement. This makes engineering a suitable cavity much easier particularly in materials such as diamond where etching high quality factor cavities remains a significant challenge.

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• Macroscopic Polarization Rotation Induced by a Single Spin
• Scalable quantum computing based on stationary spin qubits in coupled quantum dots inside double-sided optical microcavities
• Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities
• Efficient deterministic giant photon phase shift from a single charged quantum dot
• Theory of optical spin control in quantum dot microcavities
• Entanglement purification of nonlocal quantum-dot-confined electrons assisted by double-sided optical microcavities
• Device-independent quantum key distribution with spin-coupled cavities
• Noise effects and tomography of remote entangled spins in quantum dots
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• Interaction between dual cavity modes in a planar photonic microcavity
• Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities