Module Guide
... quantum mechanics we explore those mathematical concepts relating to the development of a theory of quantum computation. A number of issues will be explored as the course progresses. These will include: ...
... quantum mechanics we explore those mathematical concepts relating to the development of a theory of quantum computation. A number of issues will be explored as the course progresses. These will include: ...
Density-Matrix Description of the EPR “Paradox”
... understanding of the qbit A (unless/until Bob sends her information about his activities via a lightspeed communications channel), and when she measures it, she finds it to be a |0 with 50% probability, or a |1 with 50% probability, independent of the history of second qbit.2 Likewise nothing Alice ...
... understanding of the qbit A (unless/until Bob sends her information about his activities via a lightspeed communications channel), and when she measures it, she finds it to be a |0 with 50% probability, or a |1 with 50% probability, independent of the history of second qbit.2 Likewise nothing Alice ...
Open-System Quantum Simulation with Atoms and Ions
... Evolution of the Bell-state populations |Φ+ i (down triangles), |Φ− i (circles), |Ψ+ i (squares) and |Ψ− i (up triangles) of an initially mixed state under a pumping process with probability a, p = 1 or deterministic and b, p = 0.5. Error bars, not shown, are smaller than 2% (1σ). ...
... Evolution of the Bell-state populations |Φ+ i (down triangles), |Φ− i (circles), |Ψ+ i (squares) and |Ψ− i (up triangles) of an initially mixed state under a pumping process with probability a, p = 1 or deterministic and b, p = 0.5. Error bars, not shown, are smaller than 2% (1σ). ...
Physics 214 Lecture 11
... Semiconductors don‘t naturally emit in the red. Charles Henry (UIUC ‘65) discovered how to combine layers of different semiconductors to make a ‗quantum well‘ (essentially a 1-D ‗box‘ for electrons). By adjusting the materials, one could shift the emission wavelengths into the visible. Nick Holonyak ...
... Semiconductors don‘t naturally emit in the red. Charles Henry (UIUC ‘65) discovered how to combine layers of different semiconductors to make a ‗quantum well‘ (essentially a 1-D ‗box‘ for electrons). By adjusting the materials, one could shift the emission wavelengths into the visible. Nick Holonyak ...
Measuring Quantum Entanglement
... Letter to Max Born, 4 December 1926 Bell JS (1964). "On the EPR paradox". Physics 1, 3,Entanglement ...
... Letter to Max Born, 4 December 1926 Bell JS (1964). "On the EPR paradox". Physics 1, 3,Entanglement ...
Quantum Mechanics helps in searching for a needle in a
... computer, the logic circuitry and time steps are essentially classical, only the memory bits that hold the variables are in quantum superpositions (see [1] & [3] for a more detailed introduction to quantum computers). Quantum mechanical operations that can be carried out in a controlled way are unit ...
... computer, the logic circuitry and time steps are essentially classical, only the memory bits that hold the variables are in quantum superpositions (see [1] & [3] for a more detailed introduction to quantum computers). Quantum mechanical operations that can be carried out in a controlled way are unit ...
Chapter 7
... An electron can travel between energy states by absorbing or releasing a precise quantity of energy. ...
... An electron can travel between energy states by absorbing or releasing a precise quantity of energy. ...
Topological Quantum Computing
... such algorithm stores the quantum information redundantly, so that the information of one logical qubit is stored in three qubits. That is, the state that used to be described as, ψ = a | 0i + b | 1i is now described by ψ = a | 000i + b | 111i, with each number representing an individual qubit. Let ...
... such algorithm stores the quantum information redundantly, so that the information of one logical qubit is stored in three qubits. That is, the state that used to be described as, ψ = a | 0i + b | 1i is now described by ψ = a | 000i + b | 111i, with each number representing an individual qubit. Let ...
The 10 Biggest Unsolved Problems in Physics
... how and why does a measurement on a particle make its wave function collapse, which in turn produces the concrete reality we perceive? This issue, the Measurement Problem in quantum physics [3], may seem esoteric, but our understanding of what reality is, or if it even exists, depends on the answer. ...
... how and why does a measurement on a particle make its wave function collapse, which in turn produces the concrete reality we perceive? This issue, the Measurement Problem in quantum physics [3], may seem esoteric, but our understanding of what reality is, or if it even exists, depends on the answer. ...
Entangled State Quantum Cryptography
... information to an acceptable level [6]. Since its discovery, quantum cryptography has been demonstrated by a number of groups using weak coherent states, both in fiber-based systems [7] and in free space arrangements [8,9]. These experiments are provably secure against all eavesdropping attacks base ...
... information to an acceptable level [6]. Since its discovery, quantum cryptography has been demonstrated by a number of groups using weak coherent states, both in fiber-based systems [7] and in free space arrangements [8,9]. These experiments are provably secure against all eavesdropping attacks base ...
Note
... A bomb is placed on the lower path of a Mach–Zehnder interferometer with a single-photon light source. If the photon takes the lower path and the bomb is live, then the photon is absorbed and triggers the bomb; otherwise, if the bomb is a dud, the photon will pass through unaffected. When a photon p ...
... A bomb is placed on the lower path of a Mach–Zehnder interferometer with a single-photon light source. If the photon takes the lower path and the bomb is live, then the photon is absorbed and triggers the bomb; otherwise, if the bomb is a dud, the photon will pass through unaffected. When a photon p ...
6.2 Growth and structure of semiconductor quantum wells
... a useful starting point for the discussion because of its simplicity. Note that the separation of the first two electron level is more than three times the thermal energy at RT, where kBT 25 meV. ...
... a useful starting point for the discussion because of its simplicity. Note that the separation of the first two electron level is more than three times the thermal energy at RT, where kBT 25 meV. ...
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).