Universal quantum interfaces

Journal Article · Thu Jan 01 00:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.69.012305· OSTI ID:20640585

Lloyd, Seth ^[1]; Landahl, Andrew J ^[2]; Slotine, Jean-Jacques E ^[3]

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1. D'Arbeloff Laboratory for Information Systems and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. Center for Bits and Atoms, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. Nonlinear Systems Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

To observe or control a quantum system, one must interact with it via an interface. This article exhibits simple universal quantum interfaces--quantum input/output ports consisting of a single two-state system or quantum bit that interacts with the system to be observed or controlled. It is shown that under very general conditions the ability to observe and control the quantum bit on its own implies the ability to observe and control the system itself. The interface can also be used as a quantum communication channel, and multiple quantum systems can be connected by interfaces to become an efficient universal quantum computer. Experimental realizations are proposed, and implications for controllability, observability, and quantum information processing are explored.

• OSTI ID: 20640585
• Journal Information: Physical Review. A, Vol. 69, Issue 1; Other Information: DOI: 10.1103/PhysRevA.69.012305; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COMMUNICATIONS
CONTROL
DATA PROCESSING
ENERGY LEVELS
INFORMATION THEORY
INTERFACES
INTERFERENCE
QUANTUM MECHANICS