In the News

April 17, 2018

Spectator and data qubits

Qubits are more prone to errors than classical bits due to imperfections in controls and unwanted interaction with the environment. Measuring these noise sources can be difficult and often the qubit itself is the best detector.  The Brown Lab is part of a joint US and Australia Multi-University [...]

April 6, 2018

Direct measurement of Bacon-Shor stabilizers

The Bacon-Shor code is a fascinating quantum error correction code that has a simple description in terms of two redundancy codes, can be derived from a compass model of interacting spins, and is a subsystem code, whose extra degrees of freedom allows for syndrome extraction from measuring gauge [...]

March 26, 2018

Rovibronic spectra of CaH+ published in J. Phys. Chem. A

The first measurement of the rovibronic structure of CaH+ published in J. Phys. Chem. A.  The spectra was taken using resonance-enhanced multi-photon dissociation of CaH+ embedded in a Coulomb crystal of laser-cooled Ca+. A. T. Calvin, S. Janardan, J. Condoluci, R. Rugango, E. Pretzsch, G. Shu, and [...]

March 26, 2018

Comparing ion qubits in the context of the surface code

Which qubit is better: A qubit that is sensistive to magnetic field fluctuations, but has no leakage states, or a qubit that is insensitive to magnetic field fluctuations, but can leak outside of the qubit levels during gates?  We answer this question in the context of Zeeman and hyperfine qubits [...]

January 2, 2018

Brown Lab moves to Duke

After 11 years at Georgia Tech, the Brown Lab has moved to Duke University and is housed at the Chesterfield Building in downtown Durham.