Quantum networking of microwave photons using optical fibers

Abstract

We describe an adiabatic state transfer mechanism that allows for high-fidelity transfer of a microwave quantum state from one cavity to another through an optical fiber. The conversion from microwave frequency to optical frequency is enabled by an optomechanical transducer. The transfer process utilizes a combined dark state of the mechanical oscillator and fiber modes, making it robust against both mechanical and fiber loss. We anticipate this scheme being an enabling component of a hybrid quantum computing architecture consisting of superconducting qubits with optical interconnects.Comment: 9 pages, 4 figures. Replaced with published versio

Deterministic quantum state transfer between remote qubits in cavities

“…Subsequently, we map the derivations to a coupled atom-fiber-atom system as assumed in Refs. [36][37][38][39][40][41][42][43][44][45]. We consider a system consisting of two ground states |A and |B and an excited state |C .…”

“…As detailed in Appendix B, the simplified Hamiltonian that includes only a single fiber mode as used in Refs. [36][37][38][39][40][41][42][43][44][45] leads, in complete analogy to STIRAP in a three-level atomic system, to a success probability of state transfer by adiabatic passage that reaches unity in the adiabatic limit g 2 0 T /γ fib → ∞,…”

Optomechanical entanglement of remote microwave cavities

“…Also note that [15] specifies the opposite order of terms in the second large term of (6), likely because the naming convention in [14] caused an exchange of terms, leading to an apparently unimportant sign-flip in the coupling strengths of the baths. We leave it here, as in [5], for consistency with [14].…”

Measurement-induced long-distance entanglement of superconducting qubits using optomechanical transducers

“…The progress towards optomechanical transducers is paralleled by advances in coupling superconducting qubits with mechanical oscillators [47][48][49][50][51] but it remains a challenge to identify simple, efficient schemes for integrating superconducting qubits and light in a single, hybrid system. Theoretical proposals so far [52][53][54] considered sophisticated time-dependent protocols that involve complex control schemes and require an unprecedented coupling strength (corresponding to optomechanical cooperativities of several hundred in the example studied in Ref. [53] and up to thousands in the - Figure 1.…”