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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...
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...
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 ...
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...
Tricolour entanglement could connect qubits（图）
tricolour entanglement qubits quantum computer
2009/9/21
Physicists in Brazil have added another capability to the quantum computing toolkit by being the first to show that light beams of three different wavelengths can be entangled. This achievement could ...
Mesoscopic d-Wave Qubits: Can High-Tc Cuprates Play a Role in Quantum Computing?
high-Tc Josephson T-breaking d-wave qubit decoherence design scalability
2010/4/12
Due to nontrivial orbital pairing symmetry, surfaces and interfaces of high-Tc superconductors support states which violate time-reversal (T-) symmetry. Such naturally degenerate states, useful as wor...