Lecture 16: Quantum error correction Classical repetition codes
... decodes each block to give a total of three qubits (the first in each block). Assuming at most one bit-flip occurred in each block, the remaining 6 qubits will have all returned to the state |0i, and can be discarded or re-used. When it is time to correct phase flips, the process is again as before. ...
... decodes each block to give a total of three qubits (the first in each block). Assuming at most one bit-flip occurred in each block, the remaining 6 qubits will have all returned to the state |0i, and can be discarded or re-used. When it is time to correct phase flips, the process is again as before. ...
Lecture 22/23 1 Quantum Mechanics
... Think again about the state |00� + |11�. What happens if you measure just the first qubit? Right, with probability 1/2 you get |00�, with probability 1/2 you get |11�. Now, why might that be disturbing? Right: because the second qubit might be light-years away from the first one! For a measurement of ...
... Think again about the state |00� + |11�. What happens if you measure just the first qubit? Right, with probability 1/2 you get |00�, with probability 1/2 you get |11�. Now, why might that be disturbing? Right: because the second qubit might be light-years away from the first one! For a measurement of ...
Physics 451 Quantum Mechanics
... Conjugates quantities of a particle (ex: position & momentum) can not be known simultaneously within a certain accuracy limit 2) Quantization: The measurement of a physical quantity in a confined system results in quanta (the measured values are discrete) 3) Wave-particle duality: All particles can ...
... Conjugates quantities of a particle (ex: position & momentum) can not be known simultaneously within a certain accuracy limit 2) Quantization: The measurement of a physical quantity in a confined system results in quanta (the measured values are discrete) 3) Wave-particle duality: All particles can ...
PPT
... reproduce the results of QM. The proof was accepted for decades, until Bohm came up with a counter-example. Bohm showed that Von Neumann had snuck in a hidden assumption: that the measured property must depend only on the microsystem, and not also on the measurement apparatus. • Bohm constructed an ...
... reproduce the results of QM. The proof was accepted for decades, until Bohm came up with a counter-example. Bohm showed that Von Neumann had snuck in a hidden assumption: that the measured property must depend only on the microsystem, and not also on the measurement apparatus. • Bohm constructed an ...
Lecture-3: Atomic Structure
... a whole number of de Broglie Wavelengths. The quantum number n of an orbit is the number of electron waves that fit into the orbit. ...
... a whole number of de Broglie Wavelengths. The quantum number n of an orbit is the number of electron waves that fit into the orbit. ...
Main Topic: T1 Density-Functional Theory beyond LDA
... Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including carbo ...
... Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including carbo ...
Introduction Slides
... is the energy left over after the electron has been “lifted” over the work function barrier ...
... is the energy left over after the electron has been “lifted” over the work function barrier ...
Quantum teleportation
Quantum teleportation is a process by which quantum information (e.g. the exact state of an atom or photon) can be transmitted (exactly, in principle) from one location to another, with the help of classical communication and previously shared quantum entanglement between the sending and receiving location. Because it depends on classical communication, which can proceed no faster than the speed of light, it cannot be used for faster-than-light transport or communication of classical bits. It also cannot be used to make copies of a system, as this violates the no-cloning theorem. While it has proven possible to teleport one or more qubits of information between two (entangled) atoms, this has not yet been achieved between molecules or anything larger.Although the name is inspired by the teleportation commonly used in fiction, there is no relationship outside the name, because quantum teleportation concerns only the transfer of information. Quantum teleportation is not a form of transportation, but of communication; it provides a way of transporting a qubit from one location to another, without having to move a physical particle along with it.The seminal paper first expounding the idea was published by C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres and W. K. Wootters in 1993. Since then, quantum teleportation was first realized with single photons and later demonstrated with various material systems such as atoms, ions, electrons and superconducting circuits. The record distance for quantum teleportation is 143 km (89 mi).