Zobrazeno 1 - 10
of 221
pro vyhledávání: '"Johnson, Philip R."'
Autor:
Tiesinga, Eite, Johnson, Philip R.
Publikováno v:
Phys. Rev. A 87, 013423 (2013)
We develop an interferometric technique for making time-resolved measurements of field-quadrature operators for nonequilibrium ultracold bosons in optical lattices. The technique exploits the internal state structure of magnetic atoms to create two s
Externí odkaz:
http://arxiv.org/abs/1212.1193
Autor:
Johnson, Philip R., Hu, B. L.
Publikováno v:
Found.Phys. 35 (2005) 1117-1147
We present a stochastic theory for the nonequilibrium dynamics of charges moving in a quantum scalar field based on the worldline influence functional and the close-time-path (CTP or in-in) coarse-grained effective action method. We summarize (1) the
Externí odkaz:
http://arxiv.org/abs/gr-qc/0501029
Autor:
Johnson, Philip R., Parsons, William T., Strauch, Frederick W., Anderson, J. R., Dragt, Alex J., Lobb, C. J., Wellstood, F. C.
Publikováno v:
Phys. Rev. Lett. 94, 187004 (2005)
Prototype Josephson-junction based qubit coherence times are too short for quantum computing. Recent experiments probing superconducting phase qubits have revealed previously unseen fine splittings in the transition energy spectra. These splittings h
Externí odkaz:
http://arxiv.org/abs/quant-ph/0411181
Autor:
Xu, Huizhong, Strauch, Frederick W., Dutta, Sudeep, Johnson, Philip R., Ramos, R. C., Berkley, A. J., Paik, H., Anderson, J. R., Dragt, A. J., Lobb, C. J., Wellstood, F. C.
Publikováno v:
Phys. Rev. Lett. 94, 027003 (2005)
We study the quantum mechanical behavior of a macroscopic, three-body, superconducting circuit. Microwave spectroscopy on our system, a resonator coupling two large Josephson junctions, produced complex energy spectra well explained by quantum theory
Externí odkaz:
http://arxiv.org/abs/cond-mat/0409284
This is a progress report on our current work on moving charges, detectors, and moving mirrors in a quantum field treated in a fully relativistic way via the Feynman-Vernon influence functional method, which preserves maximal quantum coherence of the
Externí odkaz:
http://arxiv.org/abs/quant-ph/0402002
Autor:
Strauch, Frederick W., Johnson, Philip R., Dragt, Alex J., Lobb, C. J., Anderson, J. R., Wellstood, F. C.
Publikováno v:
Phys. Rev. Lett. 91, 167005 (2003)
Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, we propose two fundamental two-qubit quantum logic gates. Each of these gates, when supplemented by single-qubit operations, is sufficient for universal quant
Externí odkaz:
http://arxiv.org/abs/quant-ph/0303002
Autor:
Johnson, Philip R., Strauch, Frederick W., Dragt, Alex J., Ramos, Roberto C., Lobb, C. J., Anderson, J. R., Wellstood, F. C.
Publikováno v:
PRB 67, 020509(R) (2003)
We show that two capacitively-coupled Josephson junctions, in the quantum limit, form a simple coupled qubit system with effective coupling controlled by the junction bias currents. We compute numerically the energy levels and wave functions for the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0210278
Autor:
Johnson, Philip R., Hu, B. L.
Publikováno v:
Phys.Rev.D65:065015,2002
We apply the open systems concept and the influence functional formalism introduced in Paper I to establish a stochastic theory of relativistic moving spinless particles in a quantum scalar field. The stochastic regime resting between the quantum and
Externí odkaz:
http://arxiv.org/abs/quant-ph/0101001
Autor:
Johnson, Philip R., Hu, B. L.
We treat a relativistically moving particle interacting with a quantum field from an open system viewpoint of quantum field theory by the method of influence functionals or closed-time-path coarse-grained effective actions. The particle trajectory is
Externí odkaz:
http://arxiv.org/abs/quant-ph/0012137
Autor:
Johnson, Philip R., Hu, B. L.
We present a stochastic theory of charges moving in an electromagnetic field using nonequilibrium quantum field theory. We give a first principles' derivation of the Abraham-Lorentz-Dirac-Langevin equation which depicts the quantum expectation value
Externí odkaz:
http://arxiv.org/abs/quant-ph/0012135