RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Strong coupling between two quantum dots and a photonic crystal cavity using magnetic field tuning

TitleStrong coupling between two quantum dots and a photonic crystal cavity using magnetic field tuning
Publication TypeJournal Article
Year of Publication2011
AuthorsH. Kim, D. Sridharan, T. C. Shen, G. S. Solomon, and E. Waks
JournalOptics Express
Date Publishedjan
Keywords2011, Magneto-optic systems, Multiple Fellows, photonic crystals, Quantum electrodynamics

We demonstrate strong coupling between two indium arsenide (InAs) quantum dots (QDs) and a photonic crystal cavity by using a magnetic field as a frequency tuning method. The magnetic field causes a red shift of an exciton spin state in one QD and a blue shift in the opposite exciton spin state of the second QD, enabling them to be simultaneously tuned to the same cavity resonance. This method can match the emission frequency of two QDs separated by detunings as large as 1.35 meV using a magnetic field of up to 7 T. By controlling the detuning between the two QDs we measure the vacuum Rabi splitting (VRS) both when the QDs are individually coupled to the cavity, as well as when they are coupled to the cavity simultaneously. In the latter case the oscillator strength of two QDs shows a collective behavior, resulting in enhancement of the VRS as compared to the individual cases. Experimental results are compared to theoretical calculations based on the solution to the full master equation and found to be in excellent agreement.


Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to