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13 papers · 2 filters
Superdensity Operators for Spacetime Quantum Mechanics
Jordan Cotler, Chao-Ming Jian, Xiao-Liang Qi +1
We introduce superdensity operators as a tool for analyzing quantum information in spacetime. Superdensity operators encode spacetime correlation functions in an operator framework…
General phase spaces: from discrete variables to rotor and continuum limits
Victor V. Albert, Saverio Pascazio, Michel H. Devoret
We provide a basic introduction to discrete-variable, rotor, and continuous-variable quantum phase spaces, explaining how the latter two can be understood as limiting cases of the…
Coherent control of a single trapped Rydberg ion
Gerard Higgins, Fabian Pokorny, Chi Zhang +2
Trapped Rydberg ions are a promising novel approach to quantum computing and simulations. They are envisaged to combine the exquisite control of trapped ion qubits with the fast tw…
Dimension towers of SICs. I. Aligned SICs and embedded tight frames
Marcus Appleby, Ingemar Bengtsson, Irina Dumitru +1
Algebraic number theory relates SIC-POVMs in dimension to those in dimension . We define a SIC in dimension to be aligned to a SIC in dimension if and on…
Device-independent certification of two bits of randomness from one entangled bit and Gisin's elegant Bell inequality
Ole Andersson, Piotr Badziąg, Irina Dumitru +1
We prove that as conjectured by Ac\'ın et al. [Phys. Rev. A 93, 040102(R) (2016)], two bits of randomness can be certified in a device-independent way from one bit of entanglement…
Experimental nonlocal steering of Bohmian trajectories
Ya Xiao, Yaron Kedem, Jin-Shi Xu +2
Interpretations of quantum mechanics (QM), or proposals for underlying theories, that attempt to present a definite realist picture, such as Bohmian mechanics, require strong non-l…