54 citations · 144 across the 6 of their papers we have counts for
6 papers
Qubit coherence decay down to threshold: influence of substrate dimensions
Roland Doll, Peter Hanggi, Sigmund Kohler +1
Keeping single-qubit quantum coherence above some threshold value not far below unity is a prerequisite for fault-tolerant quantum error correction (QEC). We study the initial deph…
Fidelity and Entanglement of a Spatially Extended Linear Three-Qubit Register
Roland Doll, Martijn Wubs, Sigmund Kohler +1
We study decoherence of a three-qubit array coupled to substrate phonons. Assuming an initial three-qubit entangled state that would be decoherence-free for identical qubit positio…
On the conundrum of deriving exact solutions from approximate master equations
Roland Doll, David Zueco, Martijn Wubs +2
We derive the exact time-evolution for a general quantum system under the influence of pure phase-noise and demonstrate that for a Gaussian initial state of the bath, the exact res…
Incomplete pure dephasing of N-qubit entangled W states
Roland Doll, Martijn Wubs, Peter Hanggi +1
We consider qubits in a linear arrangement coupled to a bosonic field which acts as a quantum heat bath and causes decoherence. By taking the spatial separation of the qubits expli…
Lissajous curves and semiclassical theory: The two-dimensional harmonic oscillator
Roland Doll, Gert-Ludwig Ingold
The semiclassical treatment of the two-dimensional harmonic oscillator provides an instructive example of the relation between classical motion and the quantum mechanical energy sp…
Limitation of entanglement due to spatial qubit separation
Roland Doll, Martijn Wubs, Peter Hanggi +1
We consider spatially separated qubits coupled to a thermal bosonic field that causes pure dephasing. Our focus is on the entanglement of two Bell states which for vanishing separa…