SAX-QT QUANTUM TECHNOLOGY TALKS

Dr. Gernot Schaller,
Head Quantum Information Technology at Helmholtz-Zentrum Dresden-Rossendorf will present:

„Noise resilience via adiabatic quantum computing“

The gate-based paradigm of quantum computing is vulnerable to the presence of undesired couplings between the qubits and their environment. Straightforward remedies such as performing the gates faster or engineering better isolated qubits will face scaling problems. Quantum error correction offers a more systematic approach but comes at the cost of additional physical qubits and furthermore assumes perfect error detection and correction schemes. An alternative paradigm is adiabatic quantum computation, which instead of gates employs a slow-driving protocol based on a simple recipe: Just prepare the qubits in the ground state of a simple initial Hamiltonian and slowly deform that Hamiltonian to a final one encoding the solution to a difficult NP-hard problem in its final ground state. For a sufficiently slow driving, the adiabatic theorem should grant that one ends up close to the solution. Moreover, the coupling to a low-temperature reservoir may maintain the system near its instantaneous ground state and would thereby assist rather than hinder the computational process. In this talk, I will review the concept of adiabatic algorithms and then examine the problem of decoherence in a generic adiabatic computation. The scaling of the minimum energy gap above the ground state with problem difficulty proves to be the main obstacle, and non-straight interpolation paths can improve the robustness of adiabatic computation against environmental noise.

Please email quantum-saxony@mail.de for the access link.