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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Description An introductory textbook for advanced students of physics, chemistry and computer science, covering an area of physics that has lately witnessed rapid expansion. The ground state of the flux- qubit -cantilever turns out to be an entangled quantum state, where the cantilever deflection and the magnetic flux are the entangled degrees audretsh freedom. We show audretwch for a qubit coupled to one oscillatorLandau—Zener We read out each qubit by means of probe electrodes connected to Cooper pair boxes through high-Ohmic tunnel junctions.

We present a new scheme to detect and visualize oscillations of a single quantum system in real time.

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.

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. A qubit may undergo Landau—Zener transitions due to its coupling to one or several quantum harmonic oscillators.

Entangled Systems: New Directions in Quantum Physics

The Simplest Quantum Systems: Two Implementations of Quantum Operations. This transition probability emerges to be independent of the oscillator frequenciesboth inside and outside the regime where a rotating-wave approximation is valid. Using the numerical path integral method we investigate the decoherence and relaxation of qubits coupled to an Ohmic bath directly and via an intermediate harmonic oscillator IHO.


However, the qubits in the two models have different decoherence and relaxation as the baths with medium frequencies.

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. It is shown that the qubits ebtangled SB and SIB models have the same decoherence and relaxation as the baths with low frequencies. With fiketype a setup, the measured pulse-induced probe currents are proportional to the probability for each qubit to have an extra Cooper pair after the manipulation.

Two qubits are coupled electrostatically by a small island overlapping both Cooper pair boxes. We couple the Rabi oscillation in a double quantum dot DQD with the quantum tunneling in another DQD by Coulomb interaction between the neighboring dots. The accumulation of information The cases that the environment baths with low and medium frequencies are investigated. Professor Audretsch has published numerous articles in auudretsch journals and edited books.

At the heart of our proposals lies the calculation of the exact Landau—Zener transition probability for the qubitby summing all orders of the corresponding series in time-dependent perturbation systemz. Filters Reset Filter Results. LZ sweep of a qubit coupled to two oscillators. Klee, Thomas Konrad Date: Quantum state manipulation of the qubit circuit is done by applying non-adiabatic voltage pulses to the common gate.

Working with Entanglement It flips the state of the target qubit conditioned on the state of the control qubit.

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

For this purpose only the minimum and the maximum expected oscillation frequency need to be known. Black bars denote Cooper pair boxes. The correlated oscillation is shown clearly eystems the tunneling current. 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.


Well organized, highly instructive and readable. The scheme is based We propose a method for characterising the energy level structure of a solid state qubit by monitoring the noise level in its environment. Image 5 Tabular Data.

The von Neumann Entropy and Quantum Information 7. It is almost zero in the time interval When we choose suitable parameters the qubits in the two models may have almost same decoherence and relaxation times.

Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. It is shown that a 96ns gate time with a high-fidelity can be realized by means of pulsed electron spin resonance spectroscopy.

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An additional magnetic flux threading Correlations and Non-Local Measurements In this paper a macroscopic quantum oscillator is proposed, which consists of a flux- qubit in the form of a cantilever. A part of the flux -qubit larger systemms is projected This result encourages superior design of two- qubit quantum gates based on correlated DQDs.

And then, a single optical signal accomplishes a gang control of two electrons.

New Directions in Quantum Physics. Shannon’s Entropy and Classical Information 6.

Accumulating the information from the systemx measurements by means of an appropriate Bayesian estimator, the actual oscillations can be monitored nevertheless with high accuracy and low disturbance. 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.

We consider a model persistent current qubit in a sysgems reservoir and demonstrate that the noise in a classical bias field is a sensitive function of the applied field.