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Author | Zakka-Bajjani, Eva; Nguyen, François; Lee, Minhyea; Vale, Leila R.; Simmonds, Raymond W.; Aumentado, José | ||||
Title | Quantum superposition of a single microwave photon in two different 'colour' states | Type | Journal Article | ||
Year | 2011 | Publication | Nature Physics | Abbreviated Journal | Nat. Phys. |
Volume | 7 | Issue | 8 | Pages | 599-603 |
Keywords | fromIPMRAS | ||||
Abstract | 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. | ||||
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Notes | Approved | no | |||
Call Number | RPLAB @ gujma @ | Serial | 822 | ||
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