Lecture 18 — October 26, 2015 1 Overview 2 Quantum Entropy
... about the joint state of a quantum system than we can be about any one of its individual parts, and this is the reason that conditional quantum entropy can be negative. This is in fact the same observation that Schrödinger made concerning entangled states: “When two systems, of which we know the st ...
... about the joint state of a quantum system than we can be about any one of its individual parts, and this is the reason that conditional quantum entropy can be negative. This is in fact the same observation that Schrödinger made concerning entangled states: “When two systems, of which we know the st ...
Photon pairs with coherence time exceeding 1 μs
... and having a temporal length longer than 1 μs remains a technical challenge, because a longer single-photon time window significantly increases the probability of receiving accidental noise counts and thus reduces its immunity to a noisy environment. Meanwhile, producing photon pairs with a longer t ...
... and having a temporal length longer than 1 μs remains a technical challenge, because a longer single-photon time window significantly increases the probability of receiving accidental noise counts and thus reduces its immunity to a noisy environment. Meanwhile, producing photon pairs with a longer t ...
Multimode quantum memory based on atomic frequency combs
... tial mode defined by the direction of propagation of the input field兲, ␦ j the detuning of the atom with respect to the laser frequency, and the amplitudes c j depend on the frequency and on the spatial position of the particular atom j. The collective state can be understood as a coherent excitatio ...
... tial mode defined by the direction of propagation of the input field兲, ␦ j the detuning of the atom with respect to the laser frequency, and the amplitudes c j depend on the frequency and on the spatial position of the particular atom j. The collective state can be understood as a coherent excitatio ...
Probing Quantum Frustrated Systems via Factorization of the
... decay (fr ¼ 1= r), one has that ðr0 Þ Þ 0 8 r0 and therefore no factorized GS can exist. Therefore, fully connected models characterized by a rapidly decaying fr , and hence by low frustration, allow for GS factorization and the associated SA or DA orders. Vice versa, models with slowly decaying fr ...
... decay (fr ¼ 1= r), one has that ðr0 Þ Þ 0 8 r0 and therefore no factorized GS can exist. Therefore, fully connected models characterized by a rapidly decaying fr , and hence by low frustration, allow for GS factorization and the associated SA or DA orders. Vice versa, models with slowly decaying fr ...
Stochastic Models in Classical and Quantum Mechanics∗
... taken as the result of a single throw. The problem consists in predicting the result of a single throw of the die. We do not go into further details of the experiment – the aforesaid is enough to understand the essence of the problem. First, let the initial height h of the die above the table not ex ...
... taken as the result of a single throw. The problem consists in predicting the result of a single throw of the die. We do not go into further details of the experiment – the aforesaid is enough to understand the essence of the problem. First, let the initial height h of the die above the table not ex ...
Quantum Cheshire Cat
... with a CCD camera that measures displacement of the beam from the central position [2]. We can realize measurement of position in the left arm ΠL by putting a thin glass plate into the left arm perpendicularly to the photon’s path and then slightly tilt it . Direction of the photon passing through i ...
... with a CCD camera that measures displacement of the beam from the central position [2]. We can realize measurement of position in the left arm ΠL by putting a thin glass plate into the left arm perpendicularly to the photon’s path and then slightly tilt it . Direction of the photon passing through i ...
localization of light - University of Toronto Physics
... the distinct possibility, depicted in figure 3, of localization within a narrow frequency window when A Tin —a. It is this intermediate frequency regime that we wish to analyze in greater detail. I will refer to the aforementioned criterion for localization as the free-photon Ioffe-Regel condition. ...
... the distinct possibility, depicted in figure 3, of localization within a narrow frequency window when A Tin —a. It is this intermediate frequency regime that we wish to analyze in greater detail. I will refer to the aforementioned criterion for localization as the free-photon Ioffe-Regel condition. ...
Quantum Entanglement, Nonlocality, and Back-In
... Quantum Entanglement, Nonlocality, and Back-In-Time Messages John G. Cramer Professor Emeritus of Physics University of Washington Norwescon 33 April 3, 2010 ...
... Quantum Entanglement, Nonlocality, and Back-In-Time Messages John G. Cramer Professor Emeritus of Physics University of Washington Norwescon 33 April 3, 2010 ...
Summary of key facts
... a|0i) are central to QFT so you will need to be experienced with these. The first QFT problem sheet (see web site) is basically revision of such core concepts, I do not cover these ideas in lectures and will assume students already know them. ACP. We will work with Hamiltonians and Lagrangians, clas ...
... a|0i) are central to QFT so you will need to be experienced with these. The first QFT problem sheet (see web site) is basically revision of such core concepts, I do not cover these ideas in lectures and will assume students already know them. ACP. We will work with Hamiltonians and Lagrangians, clas ...
Quantum memory for superconducting qubits 兲
... qubits relative to the resonator frequency, as well as to each other. Although the lowest pair of levels in a harmonic oscillator cannot be frequency selected by an external driving field, resonators are quite desirable as coupling elements because of their potential for having extremely high qualit ...
... qubits relative to the resonator frequency, as well as to each other. Although the lowest pair of levels in a harmonic oscillator cannot be frequency selected by an external driving field, resonators are quite desirable as coupling elements because of their potential for having extremely high qualit ...
Quasidistributions in nonlinear quantum optics
... It is well known from the papers by R.J. Glauber [1, 2] published in 1963, founding the modern quantum optics, that optical processes having completely quantum behavior, i.e. having no classical analogue, are described by means of quasidistributions, e.g. using the weighting function in the diagonal ...
... It is well known from the papers by R.J. Glauber [1, 2] published in 1963, founding the modern quantum optics, that optical processes having completely quantum behavior, i.e. having no classical analogue, are described by means of quasidistributions, e.g. using the weighting function in the diagonal ...
On the Explanation for Quantum Statistics
... between like particles is not a real event - if it were, we should have to take account of it statistically.3 It has always been believed that Gibbs’s paradox embodied profound thought. That it was intimately linked up with something so important and entirely new [as quantum mechanics] could hardly ...
... between like particles is not a real event - if it were, we should have to take account of it statistically.3 It has always been believed that Gibbs’s paradox embodied profound thought. That it was intimately linked up with something so important and entirely new [as quantum mechanics] could hardly ...
