In collaboration with Rob Schoelkopf’s group, our work on “A Schrödinger cat living in two boxes” is published in Science.
Quantum superpositions of distinct coherent states in a single-mode harmonic oscillator, known as “cat states,” have been an elegant demonstration of Schrödinger’s famous cat paradox. Here, we realize a two-mode cat state of electromagnetic fields in two microwave cavities bridged by a superconducting artificial atom, which can also be viewed as an entangled pair of single-cavity cat states. We present full quantum state tomography of this complex cat state over a Hilbert space exceeding 100 dimensions via quantum nondemolition measurements of the joint photon number parity. The ability to manipulate such multicavity quantum states paves the way for logical operations between redundantly encoded qubits for fault-tolerant quantum computation and communication.
See News Reports:
[New Scientist] Schrödinger’s cat alive and dead even after you saw it in half
[Science News] Schrödinger’s cat now dead and alive in two boxes at once
[Washington Post] Schrödinger’s cat just got even weirder
[Xinhua News] http://news.xinhuanet.com/tech/2016-05/27/c_1118946483.htm