Quantum pathology of static internal imperfections in flawed quantum computers
arXiv:0705.4017 · doi:10.1016/j.physleta.2007.05.074
Abstract
Even in the absence of external influences the operability of a quantum computer (QC) is not guaranteed because of the effects of residual one- and two-body imperfections. Here we investigate how these internal flaws affect the performance of a quantum controlled-NOT (CNOT) gate in an isolated flawed QC. First we find that the performance of the CNOT gate is considerably better when the two-body imperfections are strong. Secondly, we find that the largest source of error is due to a coherent shift rather than decoherence or dissipation. Our results suggest that the problem of internal imperfections should be given much more attention in designing scalable QC architectures.
References in corpus (20)
- Quantum Computation with Quantum Dots
- Theory of the spin bath
- Design of Strongly Modulating Pulses to Implement Precise Effective Hamiltonians for Quantum Information Processing
- Arbitrarily accurate composite pulses
- Scalable quantum computing with Josephson charge qubits
- Quantum Process Tomography of the Quantum Fourier Transform
- Quantum Chaos Border for Quantum Computing
- Emergence of Quantum Chaos in Quantum Computer Core and How to Manage It
- Two - Level Atom - Field Interaction: Exact Master Equations for Non-Markovian Dynamics, Decoherence and Relaxation
- Entanglement Across a Transition to Quantum Chaos
- Fidelity and Purity Decay in Weakly Coupled Composite Systems
- Two qubits entanglement dynamics in a symmetry-broken environment
- Quantum chaos and random matrix theoryfor fidelity decay in quantum computationswith static imperfections
- Entanglement Sharing and Decoherence in the Spin-Bath
- Can quantum chaos enhance stability of quantum computation?
- Quantum-Classical Correspondence via Liouville Dynamics: II. Correspondence for Chaotic Hamiltonian Systems
- Decoherence of spin echoes
- Suppression of decoherence via strong intra-environmental coupling
- Emergence of Fermi-Dirac Thermalization in the Quantum Computer Core
- Probing internal bath dynamics by a Rabi oscillator-based detector