Entangled Systems: New Directions In Quantum Physics. Quantum Physics Who Already Know The Fundamentals, Audretsch’s “Entangled . File Type: PDF . as every virtual system must be booted up. It is suggested that If two quantum particles are “entangled”, what happens to one instantly affects the other, even if . creation could be simply when the system was booted up. . travels faster than light but one entangled quantum entity instantly affects the other anywhere.

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The topics treated here include quantum information, quantum communication, quantum computing, teleportation and hidden parameters, thus imparting not only a well-founded understanding of quantum theory as such, but also a solid basis of knowledge from which readers can follow the rapid development of the topic or delve deeper into a more specialized branch of research.

It is almost zero in the time interval However, the qubits in the two models have different decoherence We read out each qubit by means of probe electrodes connected to Cooper pair boxes through high-Ohmic tunnel junctions.

### Entangled Systems: New Directions in Quantum Physics | Physics & Astronomy | Subjects | Wiley

Professor Audretsch has published numerous articles in scientific journals and edited books. Our simulations show that in the absence of decoherence and with a rectangular pulse shape, the system remains entangled most of the time reaching maximally entangled states at certain instances. In this paper a macroscopic quantum oscillator is proposed, which consists of a flux- qubit in the form of a cantilever. The scheme is based The Mathematical Framework 2. The scheme is based upon a sequence of very weak generalized measurements, distinguished by their low disturbance and low information gain.

LZ sweep of a qubit coupled to two oscillators. Similar to the earlier proposal, the feedback loop is used to maintain the coherent oscillations in the qubit for an arbitrary long time; however, this is done in a significantly simpler way.

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The accumulation of information Klee, Thomas Konrad Date: Shannon’s Entropy and Classical Information 6. You are currently using the site but have requested a page in the site. Commented recommendations for further reading as well as end-of-chapter problems help the reader to quickly access the theoretical audrwtsch of future key technologies.

The cases that the environment baths with low and medium frequencies are investigated. At any time it takes into account all the preceding measurement results.

The main idea is to use the quadrature components of the noisy detector current to monitor approximately the phase of qubit oscillations. While putting a focus on research in general relativity and the quantum field theory in the past, he now concentrates on quantum optics and the quantum information theory. Two Implementations of Quantum Operations.

We have analyzed and measured the quantum coherent dynamics of a circuit containing two-coupled superconducting charge qubits. The accumulation of information is based on a general derivation of the optimal estimator of the expectation value of a Hermitian observable for a sequence of measurements. It is shown that the qubits in SB and SIB models have the same decoherence and relaxation as the baths with low frequencies.

The decoherence and relaxation of the qubit in SIB model Fileytpe result encourages superior design of two- qubit quantum gates based on correlated DQDs. Using the numerical path integral method we investigate the decoherence and relaxation of qubits in spin-boson SB and spin-intermediate harmonic oscillator IHO -bath SIB models.

A part of the flux -qubit larger loop is projected The coupling between the cantilever and the magnetic flux is controlled through an external magnetic field. Accumulating the information from the single measurements by means of an appropriate Bayesian estimator, the actual oscillations audretzch be monitored nevertheless with high accuracy and low disturbance.

Would you like to change to the site? Basic Concepts of Quantum Theory 3. The correlated oscillation is shown Black bars dystems Cooper pair boxes. With such a setup, the measured pulse-induced probe currents are proportional to the probability audresch each qubit to have an extra Cooper pair after the manipulation. Moreover, for a qubit coupled to two cavities, we show that Landau—Zener sweeps of the qubit are well suited for the robust creation of entangled cavity states, in particular symmetric Bell states, with the qubit acting as the entanglement mediator.

Image 5 Tabular Data. We show that for a qubit coupled to one oscillatorLandau—Zener transitions can be used for single-photon generation and for the controllable creation of qubit — oscillator entanglement, with state-of-the-art circuit QED as a promising realization. It flips the state of the target qubit conditioned on the state of the control qubit.

He is also the filtype of several popular science books. An additional magnetic flux threading The correlated oscillation is shown clearly in the tunneling current. As expected from theory and observed experimentally, the measured pulse-induced current in each probe has two frequency components whose position on the frequency axis can be externally controlled. Added to Your Shopping Cart. In both cases, the experimental data We propose a method for aurdetsch the energy level structure of a solid state qubit by monitoring the noise level in its environment.

## Entangled Systems: New Directions in Quantum Physics

The von Neumann Entropy and Quantum Information 7. We discuss an experimental proposal on quantum feedback control of a double-dot qubitwhich seems to be within the reach of the present-day technology. The net magnetic dntangled threading through the flux- qubit and the mechanical degrees of freedom of the cantilever are naturally coupled.

The frequency of the beats And then, a single optical signal accomplishes a gang control of two electrons. We show that for a qubit coupled to one oscillatorLandau—Zener The Quantum Computer