Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6156
Keywords
-
Categories
Funding
- United States Department of Defense
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA)
- Army Research Office [W911NF-11-1-0068]
- Department of Defense (DoD) through National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- ARC via Centre of Excellence in Engineering Quantum Systems (EQuS) [CE110001013]
- National Science Foundation [ECS-0335765]
Ask authors/readers for more resources
Unwanted interaction between a quantum system and its fluctuating environment leads to decoherence and is the primary obstacle to establishing a scalable quantum information processing architecture. Strategies such as environmental and materials engineering, quantum error correction and dynamical decoupling can mitigate decoherence, but generally increase experimental complexity. Here we improve coherence in a qubit using real-time Hamiltonian parameter estimation. Using a rapidly converging Bayesian approach, we precisely measure the splitting in a singlet-triplet spin qubit faster than the surrounding nuclear bath fluctuates. We continuously adjust qubit control parameters based on this information, thereby improving the inhomogenously broadened coherence time (T-2*) from tens of nanoseconds to >2 mu s. Because the technique demonstrated here is compatible with arbitrary qubit operations, it is a natural complement to quantum error correction and can be used to improve the performance of a wide variety of qubits in both meteorological and quantum information processing applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available