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Superconducting qubits meet Schrödinger’s cat

James E. Lukens

One of the many challenges facing those who would build a quantum computer is how to assemble a large enough group of qubits in a way that would permit useful computation. For this, solid state qubits have a clear advantage, and the natural order already present in a superconductor makes superconducting qubits a logical choice. The challenge for these “macroscopic” superconducting qubits is to achieve the required internal coherence between states in a single qubit in the face of interactions with the environment. Results of recent experiments at Stony Brook will be presented that demonstrate one can, in fact, produce a coherent superposition of flux states in SQUIDs (Superconducting Quantum Interference Devices). This coherence in SQUIDs is the strongest test to date of the predictions of quantum mechanics in a macroscopic system, e.g. Schrodinger’s cat.One of the many challenges facing those who would build a quantum computer is how to assemble a large enough group of qubits in a way that would permit useful computation. For this, solid state qubits have a clear advantage, and the natural order already present in a superconductor makes superconducting qubits a logical choice. The challenge for these “macroscopic” superconducting qubits is to achieve the required internal coherence between states in a single qubit in the face of interactions with the environment. Results of recent experiments at Stony Brook will be presented that demonstrate one can, in fact, produce a coherent superposition of flux states in SQUIDs (Superconducting Quantum Interference Devices). This coherence in SQUIDs is the strongest test to date of the predictions of quantum mechanics in a macroscopic system, e.g. Schrodinger’s cat.

Optical Fiber Communication ConferenceJun 13, 20010 citations

Decoherence in rf SQUID qubits

Douglas A. Bennett, Luigi Longobardi, Vijay Patel +3 more

arXiv:0811.2268Quantum Information ProcessingFeb 17, 200928 citations

Studies of cold fermionic systems near the Feshbach resonance

L.-W. Siu

Stony Brook University Libraries.\nSBU Graduate School in Physics and Astronomy.\nLawrence Martin (Dean of Graduate School), Thomas T. S. Kuo Dissertation Advisor\nProfessor, Department of Physics and Astronomy, Gerald E. Brown Chairperson of Defense\nDistinguished Professor, Department of Physics and Astronomy, Thomas H. Bergeman\nAdjunct Professor, Department of Physics and Astronomy, Roy A. Lacey\nProfessor, Department of Chemistry.

Aug 1, 20080 citations

Measurements of Decoherence in rf SQUID Qubits

D. A. Bennett, Luigi Longobardi, Vijay Patel +2 more

Bulletin of the American Physical SocietyMar 11, 20080 citations

Quantum Gases in State-Dependent Optical Potentials

René Reimann

Stony Brook University Libraries. SBU Graduate School in Physics and Astronomy. Lawrence Martin (Dean of Graduate School), Dominik Schneble Thesis Advisor \nAssistant Professor, Department of Physics and Astronomy \nStony Brook University, Harold Metcalf Chairperson of Defense \nDistinguished Teaching Professor, Department of Physics and Astronomy \nStony Brook University, Thomas Bergeman \nAdjunct Professor, Department of Physics and Astronomy \nStony Brook University.

Aug 1, 20090 citations

UCSB final report for the CSQ program: Review of decoherence and materials physics for superconducting qubits

John M. Martinis, A. Megrant

We review progress at UCSB on understanding the physics of decoherence in superconducting qubits. Although many decoherence mechanisms were studied and fixed in the last 5 years, the most important ones are two-level state defects in amorphous dielectrics, non-equilibrium quasiparticles generated from stray infrared light, and radiation to slotline modes. With improved design, the performance of integrated circuit transmons using the Xmon design are now close to world record performance: these devices have the advantage of retaining coherence when scaled up to 9 qubits.We review progress at UCSB on understanding the physics of decoherence in superconducting qubits. Although many decoherence mechanisms were studied and fixed in the last 5 years, the most important ones are two-level state defects in amorphous dielectrics, non-equilibrium quasiparticles generated from stray infrared light, and radiation to slotline modes. With improved design, the performance of integrated circuit transmons using the Xmon design are now close to world record performance: these devices have the advantage of retaining coherence when scaled up to 9 qubits.

arXiv:1410.5793Oct 21, 201422 citations

Studies of Decoherence in rf Squid Qubits

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Studies of Decoherence in rf Squid Qubits

Abstract

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