Quantum superposition of a single microwave photon in two different 'colour' states
Nature Physics, ISSN: 1745-2481, Vol: 7, Issue: 8, Page: 599-603
2011
- 98Citations
- 173Captures
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Article Description
Fully controlled coherent coupling of arbitrary harmonic oscillators is an important tool for processing quantum information . Coupling between quantum harmonic oscillators has previously been demonstrated in several physical systems using a two-level system as a mediating element . Direct interaction at the quantum level has only recently been realized by means of resonant coupling between trapped ions . Here we implement a tunable direct coupling between the microwave harmonics of a superconducting resonator by means of parametric frequency conversion . We accomplish this by coupling the mode currents of two harmonics through a superconducting quantum interference device (SQUID) and modulating its flux at the difference (∼7GHz) of the harmonic frequencies. We deterministically prepare a single-photon Fock state and coherently manipulate it between multiple modes, effectively controlling it in a superposition of two different 'colours'. This parametric interaction can be described as a beamsplitter-like operation that couples different frequency modes. As such, it could be used to implement linear optical quantum computing protocols on-chip . © 2011 Macmillan Publishers Limited. All rights reserved.
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