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5 papers · 2 filters
Quantum state tomography of large nuclear spins in a semiconductor quantum well: Optimal robustness against errors as quantified by condition numbers
Adam Miranowicz, Sahin K. Ozdemir, Jiri Bajer +4
We discuss methods of quantum state tomography for solid-state systems with a large nuclear spin in nanometer-scale semiconductors devices based on a quantum well. Due to q…
Impossibility of Classically Simulating One-Clean-Qubit Computation
Keisuke Fujii, Hirotada Kobayashi, Tomoyuki Morimae +3
Deterministic quantum computation with one quantum bit (DQC1) is a restricted model of quantum computing where the input state is the completely mixed state except for a single cle…
Generic Entanglement Entropy for Quantum States with Symmetry
Yoshifumi Nakata, Mio Murao
When a quantum pure state is drawn uniformly at random from a Hilbert space, the state is typically highly entangled. This property of a random state is known as generic entangleme…
Reasonable conditions for joint probabilities of non-commuting observables
Holger F. Hofmann
In the operator formalism of quantum mechanics, the density operator describes the complete statistics of a quantum state in terms of d^2 independent elements, where d is the numbe…
Accelerating the Averaging Rate of Atomic Ensemble Clock Stability using Atomic Phase Lock
Nobuyasu Shiga, Michiaki Mizuno, Kohta Kido +2
We experimentally demonstrated that the stability of an atomic clock improves at fastest rate (where is the averaging time) when the phase of a local oscillator is gen…