The Quantum Enigma is the sixth studio album by Dutch symphonic metal band Epica.

It is their first studio album with new bassist Rob van der Loo, who replaced Yves Huts in 2012.

This time we did a long pre-production in the studio and we got to check out a lot of different combinations of amps and then we could record it.

"[9] The band further commented: "Where Retrospect reflected on the first decade of our career, we’d like to think The Quantum Enigma marks the beginning of a new era, where Epica sounds heavy, modern and without compromises!

Every detail finds its way into a perfectly balanced mix, and makes Epica sound raw and overwhelming.

[10][13] On 17 March 2014, "The Essence of Silence" was released as a single and was made available for a digital download from iTunes, Amazon, Spotify, Deezer and other platforms.

In an interview with the webzine Sonic Cathedral, Simons confirmed that a video for "Unchain Utopia" was set to be released soon.

[18] Simons and Delahaye premiered songs from the new album in an acoustic set at Vintage Vinyl, Fords, New Jersey on 7 April.

[19] The whole band reunited on stage on 30 April for an album release performance at 013 in Tilburg, The Netherlands, the first venue of The Quantum Enigma Tour.

[20] They went on tour through Europe, Asia, Africa and both South and North America and played 123 shows.

[21] On 3 June 2015 Epica announced the last venue for their tour in support of The Quantum Enigma to be 22 November 2015 at Klokgebouw in Eindhoven, the Netherlands and revealed that it was a part of the first edition of their very own festival Epic Metal Fest.

[22] The album was released in five different versions: regular jewel case, 2-CD digipak, 3-CD earbook, double vinyl, and digital download.