"Ideally, you would like to come up with a method to control the device accurately even in the presence of uncertainties and errors", stated co-author Chandrasekhar Ramanathan, an assistant professor of physics and astronomy.
One way to achieve this is through the use of adiabatic pulses, a class of amplitude- and frequency-modulated pulses that are used extensively to enable robust control of quantum operations. In quantum physics, an adiabatic process is one in which the configuration of a system is changed gradually enough so that the system is able to respond to the changes without being excited to higher energies. The drawback to using these adiabatic pulses is that they are typically very slow.
The Dartmouth team investigated a new class of faster adiabatic pulses that still retained the property of being insensitive to small errors.
"We came up with a systematic method to design fast adiabatic pulses, using only the controls that an experimenter may have available in the laboratory, thus offering a new way to accurately control quantum devices", Chandrasekhar Ramanathan stated.
The findings appear in the journalPhysical Review A.