搜索结果: 1-15 共查到“理学 qubits”相关记录43条 . 查询时间(0.124 秒)
In principle, quantum-based devices such as computers and sensors could vastly outperform conventional digital technologies for carrying out many complex tasks. But developing such devices in practice...
MIT physicists have discovered a new quantum bit, or “qubit,” in the form of vibrating pairs of atoms known as fermions. They found that when pairs of fermions are chilled and trapped in an optical la...
Tailoring population inversion in Landau-Zener-Stuckelberg interferometry of flux qubits
Tailoring population inversion Landau-Zener-Stuckelberg interferometry flux qubits
2012/2/27
We distinguish different mechanisms for population inversion in flux qubits driven by dc+ac magnetic fields. We show that for driving amplitudes such that there are Landau-Zener-St\"uckelberg interefe...
Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
Complete universal quantum gate set fault-tolerant thresholds superconducting qubits
2012/2/27
We use quantum process tomography to characterize a full universal set of all-microwave gates on two superconducting single-frequency single-junction transmon qubits. All extracted gate fidelities, in...
Two Local Observables are Sufficient to Characterize Maximally Entangled States of N Qubits
Local Observables Characterize Maximally Entangled States
2010/11/8
Maximally entangled states (MES) represent a valuable resource in quantum information processing. In $N$-qubit systems the MES are $N$-GHZ states, i.e. the collection of $\ket{GHZ_N}=\frac{1}{\sqrt{2}...
Wirebond crosstalk and cavity modes in large chip mounts for superconducting qubits
Wirebond crosstalk cavity modes large chip mounts superconducting qubits
2010/11/25
We analyze the performance of a microwave chip mount that uses
wirebonds to connect the chip and mount grounds. A simple impedance ladder model predicts that transmission crosstalk between two feedli...
Quantitative evaluation of defect-models in superconducting phase qubits
Quantitative evaluation defect-models superconducting phase qubits
2010/11/11
We use high-precision spectroscopy and detailed theoretical modelling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting the experimental data ...
Interface Between Topological and Superconducting Qubits
Interface Topological Superconducting Qubits
2010/11/11
We propose and analyze an interface between a topological qubit and a superconducting flux qubit. In our scheme, the interaction between Majorana fermions in a topological insulator is coherently cont...
Optimal quantum cloning of orbital angular momentum photon qubits via Hong-Ou-Mandel coalescence
Optimal quantum cloning orbital angular momentum photon via Hong-Ou-Mandel coalescence
2010/11/8
The orbital angular momentum (OAM) of light, associated with a helical structure of the wavefunction, has a great potential for quantum photonics, as it allows attaching a higher dimensional quantum s...
Entanglement of two qubits mediated by one-dimensional plasmonic waveguides
Entanglement two qubits mediated one-dimensional plasmonic waveguides
2010/11/11
We investigate qubit-qubit entanglement mediated by plasmons supported by one-dimensional waveguides. We explore both the situation of spontaneous formation of entanglement from an unentangled state ...
Complete Characterization of the Ground Space Structure of Two-Body Frustration-Free Hamiltonians for Qubits
Ground Space Structure Two-Body Frustration-Free Hamiltonians Qubits
2010/11/5
The problem of finding the ground state of a frustration-free Hamiltonian carrying only two-body interactions between qubits is known to be solvable in polynomial time. It is also shown recently that,...
Reexamination of determinant-based separability test for two qubits
Reexamination determinant-based separability qubits
2010/10/29
It was shown in [Augusiak et al.,\;Phys. Rev. A \textbf{77}, 030301(R) (2008)] that discrimination between entanglement and separability in a two qubit state can be achieved by a measurement of a sin...
Time-optimal CNOT between indirectly coupled qubits in a linear Ising chain
Time-optimal CNOT indirectly coupled qubits linear Ising chain
2010/10/21
We give analytical solutions for the time-optimal synthesis of entangling gates between indirectly coupled qubits 1 and 3 in a linear spin chain of three qubits subject to an Ising Hamiltonian interac...
Divergences in the 2-qubits' space: Werner and Thermal states
Jensen-Shannono divergence Heisenberg model
2010/9/13
We revisit the notion of using divergences, or relative-entropies, as measures of the distance between two mixed states, with special emphasis on power-law entropies. We analyze the Csisz´ar and...
Three qubits in a symmetric environment: dissipatively generated asymptotic entanglement
Three qubits symmetric environment asymptotic entanglement
2010/10/18
We study the asymptotic entanglement of three identical qubits under the action of a Markovian open system dynamics that does not distinguish them.We show that by adding a completely depolarized qubit...