Simulating long-distance entanglement in quantum spin chains by superconducting flux qubits
arXiv:1410.5444 · doi:10.1103/PhysRevA.91.022315
Abstract
We investigate the performance of superconducting flux qubits for the adiabatic quantum simulation of long distance entanglement (LDE), namely a finite ground-state entanglement between the end spins of a quantum spin chain with open boundary conditions. As such, LDE can be considered an elementary precursor of edge modes and topological order. We discuss two possible implementations which simulate open chains with uniform bulk and weak end bonds, either with Ising or with XX nearest-neighbor interactions. In both cases we discuss a suitable protocol for the adiabatic preparation of the ground state in the physical regimes featuring LDE. In the first case the adiabatic manipulation and the Ising interactions are realized using dc currents, while in the second case microwaves fields are used to control the smoothness of the transformation and to realize the effective XX interactions. We demonstrate the adiabatic preparation of the end-to-end entanglement in chains of four qubits with realistic parameters and on a relatively fast time scale.
12 pages, 14 figures. Final manuscript, close to the published version
References in corpus (17)
- Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
- Controllable coupling of superconducting flux qubits
- Two-Qubit State Tomography using a Joint Dispersive Read-Out
- Long-distance entanglement in spin systems
- Long-distance entanglement and quantum teleportation in XX spin chains
- Entanglement dynamics in chains of qubits with noise and disorder
- Four-qubit device with mixed couplings
- Direct Josephson coupling between superconducting flux qubits
- Possible implementation of adiabatic quantum algorithm with superconducting flux qubits
- Long-distance entanglement and quantum teleportation in coupled cavity arrays
- Reading-out the state inductively and microwave spectroscopy of an interferometer-type charge qubit
- Entanglement replication in driven-dissipative many body systems
- Modular Entanglement
- Tunable-Cavity QED with Phase Qubits
- Tuned transition from quantum to classical for macroscopic quantum states
- Entanglement of distant atoms by projective measurement: The role of detection efficiency
- Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation