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"... the quantum coherence of a nanomechanical resonator using a superconducting ..."
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the quantum coherence of a nanomechanical resonator using a superconducting
Coherence of spin qubits in silicon
, 2006
"... Given the effectiveness of semiconductor devices for classical computation one is naturally led to consider semiconductor systems for solid state quantum information processing. Semiconductors are particularly suitable where local control of electric fields and charge transport are required. Convent ..."
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Cited by 2 (0 self)
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to build one in a semiconductor. One possible approach is to use spins as qubits: of nuclei, of electrons, or both in combination. Long qubit coherence times are a prerequisite for quantum computing, and in this paper we will discuss measurements of spin coherence in silicon. The results are encouraging
Good quantum error correcting codes exist
 REV. A
, 1996
"... A quantum errorcorrecting code is defined to be a unitary mapping (encoding) of k qubits (2state quantum systems) into a subspace of the quantum state space of n qubits such that if any t of the qubits undergo arbitrary decoherence, not necessarily independently, the resulting n qubits can be used ..."
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Cited by 349 (9 self)
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A quantum errorcorrecting code is defined to be a unitary mapping (encoding) of k qubits (2state quantum systems) into a subspace of the quantum state space of n qubits such that if any t of the qubits undergo arbitrary decoherence, not necessarily independently, the resulting n qubits can
Coherence control for qubits
, 2004
"... We study the influence of an external driving field on the coherence properties of a qubit subject to bitflip noise. In the presence of driving, two paradigmatic cases are considered: (i) a field that results for a suitable choice of the parameters in socalled coherent destruction of tunneling and ..."
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We study the influence of an external driving field on the coherence properties of a qubit subject to bitflip noise. In the presence of driving, two paradigmatic cases are considered: (i) a field that results for a suitable choice of the parameters in socalled coherent destruction of tunneling
Quantum Dynamics and Coherence of Qubits
"... Abstract — We review results in theoretical modeling of quantum systems in support of the studies of decoherence and qubit interactions for quantum information processing. The developed modeling tools have been applied to semiconductor materials and nanostructures that show promise for implementatio ..."
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for implementation of coherent, controlled quantum dynamics at the level of registers of several quantum bits (qubits), such as spins. Fieldtheoretical techniques have been utilized to address decoherence and more generally the origin and effects of quantum noise and the loss of entanglement in quantum dynamics
Probing quantum coherence in qubit arrays
"... We discuss how the observation of population localization effects in periodically driven systems can be used to quantify the presence of quantum coherence in interacting qubit arrays. Essential for our proposal is the fact that these localization effects persist beyond tightbinding Hamiltonian mode ..."
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We discuss how the observation of population localization effects in periodically driven systems can be used to quantify the presence of quantum coherence in interacting qubit arrays. Essential for our proposal is the fact that these localization effects persist beyond tightbinding Hamiltonian
Dephasing of entangled qubits
, 2008
"... We investigate the influence of nearby twolevel systems on the dynamics of a qubit. The intrinsic decoherence is given by a coupling of both the qubit and the twolevel systems to a heat bath. Assuming weak interactions between the qubit and the twolevel systems we show that the dephasing of the q ..."
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of quantum operations performed during the qubit coherence time, should be at least 10 4 to allow for quantum error correction[5]. We will not discuss the
It from qubit
 Science and Ultimate Reality (Cambridge
, 2003
"... Of John Wheeler’s ‘Really Big Questions’, the one on which the most progress has been made is It From Bit? – does information play a significant role at the foundations of physics? It is perhaps less ambitious than some of the other Questions, such as How Come Existence?, because it does not necess ..."
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Of John Wheeler’s ‘Really Big Questions’, the one on which the most progress has been made is It From Bit? – does information play a significant role at the foundations of physics? It is perhaps less ambitious than some of the other Questions, such as How Come Existence?, because it does not necessarily require a
Limitation of entanglement due to spatial qubit separation
, 2006
"... 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 separation are known as robust and fragile entangled states. The reduced twoqubit dynamics is solved exactly and explicitly. ..."
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Cited by 5 (1 self)
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. Our results allow us to gain information about the robustness of twoqubit decoherencefree subspaces with respect to physical parameters such as temperature, qubitbath coupling strength and spatial separation of the qubits. Moreover, we clarify the relation between singlequbit coherence and twoqubit
Results 1  10
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6,896