Author(s): Andreas Norrman, Kasimir Blomstedt, Tero Setälä, and Ari T. Friberg
We derive two general complementarity relations for the distinguishability and visibility of genuine vector-light quantum fields in double-pinhole photon interference involving polarization modulation. The established framework reveals an intrinsic aspect of wave-particle duality of the photon, not ...
[Phys. Rev. Lett. 119, 040401] Published Tue Jul 25, 2017

Author(s): L. García-Álvarez, I. L. Egusquiza, L. Lamata, A. del Campo, J. Sonner, and E. Solano
We propose the digital quantum simulation of a minimal AdS/CFT model in controllable quantum platforms. We consider the Sachdev-Ye-Kitaev model describing interacting Majorana fermions with randomly distributed all-to-all couplings, encoding nonlocal fermionic operators onto qubits to efficiently im...
[Phys. Rev. Lett. 119, 040501] Published Tue Jul 25, 2017

Author(s): Siddharth Muthukrishnan and Daniel A. Lidar
In various applications one is interested in quantum dynamics at intermediate evolution times, for which the adiabatic approximation is inadequate. Here we develop a quasiadiabatic approximation based on the WKB method, designed to work for such intermediate evolution times. We apply it to the probl...
[Phys. Rev. A 96, 012329] Published Tue Jul 25, 2017

Author(s): Varad R. Pande, Gaurav Bhole, Deepak Khurana, and T. S. Mahesh
Cooling the qubit into a pure initial state is crucial for realizing fault-tolerant quantum information processing. Here we envisage a star-topology arrangement of reset and computation qubits for this purpose. The reset qubits cool or purify the computation qubit by transferring its entropy to a he...
[Phys. Rev. A 96, 012330] Published Tue Jul 25, 2017

Blind quantum computation protocols allow a user to delegate a computation to
a remote quantum computer in such a way that the privacy of their computation
is preserved, even from the device implementing the computation. To date, such
protocols are only known for settings involving at least two quantum devices:
either a user with some quantum capabilities and a remote quantum server or two
or more entangled but noncommunicating servers. In this work, we take the first

The unification of quantum mechanics and gravity remains as one of the
primary challenges of present-day physics. Quantum-gravity-inspired
phenomenological models offer a window to explore potential aspects of quantum
gravity including qualitatively new behaviour that can be experimentally
tested. One such phenomenological model is the generalized uncertainty
principle (GUP), which predicts a modified Heisenberg uncertainty relation and
a deformed canonical commutator. It was recently shown that optomechanical

It is shown that the adiabatic Born-Oppenheimer expansion does not satisfy
the necessary condition for the applicability of perturbation theory. A simple
example of an exact solution of a problem that can not be obtained from the
Born-Oppenheimer expansion is given. A new version of perturbation theory for
molecular systems is proposed.

John S. Bell is well known for the result now referred to simply as "Bell's
theorem," which removed from serious consideration by physics of local
hidden-variable theories. Under these circumstances, if quantum theory is to
serve as a truly {\em fundamental} theory, conceptual precision in its
interpretation is not only even more desirable but paramount. John Bell was
accordingly concerned about what he viewed as conceptual imprecision, from the
physical point of view, in the standard approaches to the theory. He saw this

We study a quantum absorption refrigerator, in which a target qubit is cooled
by two machine qubits in a nonequilibrium steady-state. It is realized by a
strong internal coupling in the two-qubit fridge and a vanishing tripartite
interaction among the whole system. The coherence of a machine virtual qubit is
investigated as quantumness of the fridge. A necessary condition for cooling
shows that the quantum coherence is beneficial to the nonequilibrium fridge,

An opto-electro-mechanical system formed by a nanomembrane capacitively
coupled to an LC resonator and to an optical interferometer has been recently
employed for the high--sensitive optical readout of rf signals [T. Bagci,
\emph{et~al.}, Nature {\bf 507}, 81 (2013)]. Here we propose and experimentally
demonstrate how the bandwidth of such kind of transducer can be increased by
controlling the interference between two-electromechanical interaction pathways