Multi-Qubit Coherent Operations (MQCO)
Several quantum computing research groups have demonstrated considerable control of two-level quantum mechanical systems (qubits) using a number of fundamentally different physical implementations. Progress in accomplishing two-qubit interactions in a well controlled manner has also been demonstrated. Some qubit implementations have provided sufficient control to implement high quality two qubit entangling gates, and even a few three and four qubit algorithms have been performed. Following this path toward the goal of fault tolerant quantum computing, most research to-date has focused on improving the fidelity of physical systems composed of a small number of qubits. Though there is still a significant gap between current qubit performance and that required for fault tolerance, a careful assessment of the last ten years makes it apparent that the degree of control over single- and two-qubit systems has improved substantially.
IARPA believes that resources should now be applied to build upon the aforementioned scientific successes by exploring the performance of multi-qubit systems. To accomplish this, researchers will have to maintain and improve the control over quantum operations in a more complex and noisier environment, which includes cross-talk from nearby qubits and their control, coupling, and readout systems. Additional challenges will arise from the inherent difficulty of increasing qubit density. The goal of the MQCO program is to define, explore, and address the new set of challenges, whether or not anticipated, that will be met when operating multi-qubit systems.
IARPA seeks proposals from all capable, qualified, and eligible sources from within and outside of the US to aggressively pursue this goal.
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