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June 4, 2008 | Research News

How to Talk to Your Quantum Computer

No matter how exotic the innards of tomorrow’s quantum computers may be, users will still have to communicate with them using classical electronic circuits.

That deceptively simple statement conceals a host of very complicated problems. Every physical system under consideration as a quantum data bit (“qubit”) -- whether it consists of neutral atoms, ions, electron/ nuclear spins, quantum dots or ...

May 7, 2008 | Research News

A New State of the Fifth State

If a group of JQI researchers is right, one of the strangest phenomena in nature has an even stranger side that could lead to previously unseen kinds of atomic behavior, and possibly to a means of robustly fault-tolerant quantum computation.

Their goal is a radical variation on a condition called Bose-Einstein condensation, often deemed the “fifth state” of matter after ...

May 2, 2008 | Research News

Experimental SQUID Microscope Gets to Gigahertz

Suppose you needed to find the location of an electrical fault in a microchip running at a couple billion cycles per second. How would you do it? Answer: You could drill very small holes into the chip so that tiny voltage sensitive probes could reach in and measure what was happening at different places -- a slow and destructive process. ...

April 17, 2008 | Research News

Optical Lattices Shape Up

An optical lattice is formed by the intersection of multiple laser beams, producing a standing wave pattern. Within that pattern, as the beams interact with each other, there are regions with higher and lower energy intensity.

April 15, 2008 | Research News

An STM to Measure Phase Differences in Superconductors

Twenty years after the discovery of high temperature superconductors, the mechanisms that cause those materials to lose electrical resistance remain unknown. To understand the phenomenon, researchers will have to determine precisely which aspects of a material’s atomic configuration contribute to superconductivity, and to measure telltale differences at the atomic scale between very slightly different arrangements in a material’s crystal lattice. ...

April 9, 2008 | Research News

Closing the Detection Loophole Over a Meter

JQI/UMD researchers have increased by five orders of magnitude the distance over which a highly stringent test of a key quantum-mechanical principle can be successfully conducted. In doing so, Chris Monroe and colleagues* validated a technique that could eventually lead to final resolution of a 70-year-old debate over the nature of physical reality that pitted Albert Einstein against Niels Bohr. ...

April 2, 2008 | Research News

Twin Beams for Quantum Imaging

JQI researchers have demonstrated a specially interconnected pair of “squeezed light” beams, reduced-noise optical waves whose properties are related to each other to a degree greater than allowed by classical physics.

March 27, 2008 | Research News

Controlling Decoherence

To scientists seeking a basis for future quantum information processing, there is no more urgent or vexing problem than delaying the onset of “decoherence” – the collapse of delicate, but essential, quantum states.

The ability to store and manipulate information of any kind requires a dependable medium with which to record data and perform operations. In a conventional computer, where ...

Lyman alpha photons
March 26, 2008 | Research News

Neutron Detection by Light: A 100-fold Improvement

JQI researchers have developed a new optical method to detect individual neutrons and record them over a range of intensities at least a hundred times greater than existing detectors.

JQI's Roman Lutchyn, Pavel Nagornykh, and Benjamin Lee
March 24, 2008 | People News

JQI Culture: Synergies and Opportunities

JQI’s distinctive commitment to integrating research and education courages multiple collaborations and flexible interactions among faculty, postdocs and students.