Conveners
Workshop on Quantum Foundations and Quantum Information
- Yakir Aharonov (Chapman University)
Workshop on Quantum Foundations and Quantum Information
- Yakir Aharonov (Chapman University)
Workshop on Quantum Foundations and Quantum Information: 24 August 2017: Dedicated to Yakir Aharonov's 85th Birthday
- Avshalom Elitzur (Iyar)
- Yakir Aharonov (Tel Aviv University and Chapman University)
- Eliahu Cohen (University of Bristol)
Workshop on Quantum Foundations and Quantum Information: 24 August 2017: Dedicated to Yakir Aharonov's 85th Birthday
- Yakir Aharonov (Tel Aviv University and Chapman University)
- Avshalom Elitzur (Iyar)
- Eliahu Cohen (University of Bristol)
Workshop on Quantum Foundations and Quantum Information: 24 August 2017: Dedicated to Yakir Aharonov's 85th Birthday
- Avshalom Elitzur (The Israeli Institute for Advanced Research)
- Yakir Aharonov (Tel Aviv University and Chapman University)
- Eliahu Cohen (University of Bristol)
Workshop on Quantum Foundations and Quantum Information: 24 August 2017: Dedicated to Yakir Aharonov's 85th Birthday
- Eliahu Cohen (University of Bristol)
- Yakir Aharonov (Tel Aviv University and Chapman University)
- Avshalom Elitzur (The Israeli Institute for Advanced Research)
Workshop on Quantum Foundations and Quantum Information
- Yakir Aharonov (Chapman University)
Workshop on Quantum Foundations and Quantum Information
- Yakir Aharonov (Chapman University)
Entanglement in quantum mechanics contradicts local realism, and is a manifestation of quantum non-locality. Its presence can be detected through the violation of Bell, or CHSH inequalities.Paradigmatic quantum systems provide examples of both, non-entangled and entangled states.
Here we consider entanglement of non-local degrees of freedom emerging from topological properties of many-body...
The discrete time quantum walk defined as a quantum-mechanical analogue of the discrete time random walk have recently been attracted from various and interdisciplinary fields. The weak limit theorem, that is,
the asymptotic behavior, of the one-dimensional discrete time quantum walk is analytically shown. From the limit distribution of the discrete time quantum walk, the discrete time...
I revisit earlier proposals on entangled and mixed
state post-selections. Pure state post-selections are the
primary ones, mixed state post-selections can be reduced
from them. Accordingly, generic mixed-entangled two-states
correspond to reductions and/or non-selective measurements
of pure two-states. I discuss when Bob is able, via weak
measurements, to decide if Alice prepared for him a...
To make quantum theory consistent, models of spontaneous wave function collapse (collapse models) propose to modify the Schrödinger equation by including nonlinear and stochastic terms, which describe the collapse of the wave function in space. These spontaneous collapses are “rare” for microscopic systems, hence their quantum properties are left almost unaltered. At the same time, since the...
Matter-wave interferometry provides an excellent tool for probing the environment and studying its coupling to isolated atoms. We will present several interferometry experiments done with a BEC on an atom chip [1] and in which different effects of the environment have been investigated. First, we will discuss fluctuations in the nearby environment probed by an interference of atoms trapped in...
We report on a stringent test of the nonclassicality of the motion of a massive quantum particle that propagates on a discrete lattice. Measuring temporal correlations of the position of single Cs atoms performing a quantum walk, we observe a 6σ violation of the Leggett-Garg inequality [1]. Our results rigorously exclude (i.e., falsify) any explanation of the motion of a Cs atom based on...
The interference between two paths of a single photon at a double slit is widely considered to be the most paradoxical result of quantum theory. Here is a new interesting question to the phenomenon: can a single shutter simultaneously close two slits by effectively being in a superposition of different locations? Supprisingly, Aharonov and Vaidman have shown that it is indeed possible to...
TBA
We present a paradox involving a particle and a mirror. They exchange a nonlocal quantity - weak modular angular momentum, $\langle L_z ~\rm{mod}~2\hbar\rangle_w$ - but no local interaction between them seems to allow such an exchange. We demonstrate that the particle and mirror $do$ interact locally via a $local$ $current$ of $\langle L_z ~\rm{mod}~2\hbar\rangle_w$. In this sense, we...
TBA
Faster than Fourier (pre)visited: vorticulture, noise, fractals...
TBA
The adiabatic control of quantum systems has the advantage of robustness against experimental errors in pulse shape; however, to ensure the adiabaticity condition, the length of the pulses have to be rather long - a disadvantage especially in solid-state qubits where the coherence time is still not too large.
Here we demonstrate a protocol of "transitionless" drive proposed by Berry,...
The foundations of quantum mechanics have always been
closely tied to statistical physics; historically, of
course, the former subject began through wrestling with
unresolved issues in the latter. This presentation
introduces a new concept, statistical superdegeneracy
(unrelated to magnetism and band structures) that may have
implications for quantum foundations. As one possible...
There is a new theory of information based on logic. The definition of Shannon entropy as well as the notions on joint, conditional, and mutual entropy as defined by Shannon can all be derived by a uniform transformation from the corresponding formulas of logical information theory. Information is first defined in terms of sets of distinctions without using any probability measure. When a...
A paradigmatic example of quantum computational speedup is the simplest instance of the quantum algorithm devised by Grover. Bob, the problem setter, hides a ball in one of four drawers. Alice, the problem solver, is to locate it by opening drawers. In the classical case, Alice needs to open up to three drawers, always one in the quantum case.
The drawer and ball problem is an example of...
We study entropic, variance based, probabilistic, and weighted quantum uncertainty relations, as well as their experimental verifications. The related quantum coherence and quantum correlations like quantum discord, quantum entanglement, quantum steering, Bell non-locality are also investigated.
- Wenchao Ma, Zhihao Ma, Hengyan Wang, Ying Liu, Zhihua Chen, Fei Kong, Zhaokai Li, Mingjun Shi,...
Bell's theorem states that quantum theory violates the principle of local-realism. It is known, however, that several nonlocal models cannot reproduce the entire range of quantum mechanical correlations either. What is it then that distinguishes quantum nonlocality from the nonlocality of other potential theories? In this talk we will see that quantum nonlocality is unique in that it stems...
Peculiarities of quantum mechanical predictions on a fundamental level are investigated intensively in matter-wave optical setups; in particular, neutron interferometric strategy has been providing almost ideal experimental circumstances for experimental demonstrations of quantum effects. In this device quantum interference between beams spatially separated on a macroscopic scale is put on...
Measurements are the very basis of Physics, especially in Quantum Mechanics (QM), where they assume even a more fundamental role because of the wave function collapse occurring after a “strong” (projective) measurement. Furthermore, measuring a quantum-mechanical observable completely erases the information on its conjugate one (e.g., position measurement erases information on momentum, and...
Homodyne measurement is a corner-stone of quantum optics. It measures the fundamental variables of quantum electrodynamics - the quadratures of light, which represent the cosine-wave and sine-wave components of an optical field. The quadratures constitute the quantum optical analog of position and momentum in mechanics and obey quantum uncertainty, indicating the inherent inability to measure...
Complementarity prohibits one to measure two conjugate quantities simultaneously, such as position and momentum, relying on the existence of the Heisenberg uncertainty principle. This property can be used for sharing information securely between two parties, e.g. through the use of quantum key distribution (QKD). Moreover, the no-cloning theorem, a fundamental law in quantum mechanic,...
Acceleration radiation is caused by virtual processes in which an atom jumps from the ground state to an excited state, together with the emission of a photon. If an atom is accelerated away from the original point of virtual emission then there is a small probability that the virtual photon will "get away". When ground-state atoms are accelerated through a high Q microwave cavity, radiation...
Acceleration radiation is caused by virtual processes in which an atom jumps from the ground state to an excited state, together with the emission of a photon. If an atom is accelerated away from the original point of virtual emission then there is a small probability that the virtual photon will "get away". When ground-state atoms are accelerated through a high Q microwave cavity, radiation...
